Source: https://patents.google.com/patent/TW306036B/en
Timestamp: 2020-05-31 11:34:05
Document Index: 494561412

Matched Legal Cases: ['art 2', 'art 2', '§3', 'art. 7', 'art. 16', 'art 2', 'art 2']

TW306036B - Semiconductor memory device with capacitor (part 2) - Google Patents
Semiconductor memory device with capacitor (part 2) Download PDF
TW306036B
TW306036B TW85110005A TW85110005A TW306036B TW 306036 B TW306036 B TW 306036B TW 85110005 A TW85110005 A TW 85110005A TW 85110005 A TW85110005 A TW 85110005A TW 306036 B TW306036 B TW 306036B
TW85110005A
Fang-Chinq Jaw
1996-08-16 Application filed by United Microelectronics Corp filed Critical United Microelectronics Corp
1996-08-16 Priority to TW85110005A priority Critical patent/TW306036B/en
1997-01-20 Priority claimed from JP9007949A external-priority patent/JP2977077B2/en
1997-05-21 Publication of TW306036B publication Critical patent/TW306036B/en
A semiconductor memory device with capacitor comprises of: (1) one substrate; (2) one transfer transistor formed on the substrate, and including drain and source region; (3) one storage capacitor electrically coupled to one of drain and source region of the transfer transistor; The storage capacitor comprises of: (1) one trunk-type like conductive layer, with one bottom electrically coupled to one of drain and source region of the transfer transistor, and with one upward extending part from the bottom with one approximately upward direction; (2) one branch-type like up conductive layer electrically coupled to above of the trunk-type like conductive layer; (3) at least one branch-type like down conductive layer with one cross section like L-shape and connected to on down surface of the branch-type like up conductive layer, in which the trunk-type like conductive layer, the branch-type like up conductive layer, and type branch-type like down conductive layer constitue one storage electrode of the storage capacitor; (4) one dielectric formed on the trunk-type like conductive layer, the branch-type up conductive layer, and exposed surface of the branch-type down conductive layer; and (5) one up conductive layer formed on the dielectric to constitute one opposed electrode of the storage capacitor.
306036 A7 B7 printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of the invention (1) The present invention relates to a semiconductor memory device (Semiconductor Memory Device) with a capacitor, and particularly relates to a dynamic random access memory A memory cell (Memory Cell) structure of a dynamic random access memory (DRAM), which includes a transfer transistor (Transfer Transistor) and a tree-type storage capacitor. Figure 1 is a schematic circuit diagram of a memory cell of a DRAM device. As shown in the figure, a memory cell is composed of a transfer transistor T and a storage capacitor C. The source of the transfer transistor T is connected to a corresponding bit line BL, the drain is connected to a storage electrode 6 (storage electrode) of the storage capacitor C, and the gate is connected to a corresponding word line WL. A opposed electrode 8 of the storage capacitor C is connected to a fixed voltage source, and a dielectric film layer 7 is provided between the storage electrode 6 and the opposite electrode 8. When the storage capacity of the traditional DRAM is less than 1M (mega = million) bits, in the integrated circuit manufacturing process, it is mainly realized by using a capacitor with a two-dimensional space, which is also known as a flat type capacitor (Planai * type capacitor) ). A flat capacitor requires a considerable area of the semiconductor substrate to store charge, so it is not suitable for high accumulation. Highly integrated DRAMs, such as those with a storage capacity greater than 4M bits, need to be realized with three-dimensional capacitors, such as so-called stacked type or trench type capacitors. Compared with flat capacitors, stacked or trench capacitors can still obtain a considerable size of 3 when the size of the memory cell has been further reduced -------- 1 * Package-- {please read first (Notes on the back then fill this page)
, 1T line This paper scale is applicable to China National Standard (cns) Λ4 specifications (210x297 mm) 306036 at B7 Ministry of Economic Affairs Central Standards Bureau employee consumption cooperation Du Yin ^ V. Invention description (2) Electric capacity. Nonetheless, when memory devices enter a higher degree of integration, such as DRAM with 64M bit capacity, the simple three-dimensional capacitor structure is no longer suitable. One of the solutions is to use so-called fin type stacked capacitors. For the related technology of fin-type stacked capacitors, please refer to the paper "3-Dimensional Stacked Capacitor Cell for 16M and 64M DRAMs 5% International Electron Devices Meeting, pp. 592-595, Dec. 1988" by Ema et al. The dielectric film layer is composed of a plurality of stacked layers, extending into a horizontal fin structure in order to increase the surface area of the electrode. For DRAM fin-type stacked capacitors, related US patents can refer to No. 5,071,783, 5,126,810, 5,196,365, and No. 5,206,787. Another solution is to use the so-called cylinder type (cylindrical type) stacked capacitors. For the related technology of the cylinder type stacked capacitors, please refer to the paper "1 ^ (^ 61813〇1 &lt;; 6 (1 € 3 卩 3 (^ 1; 〇1: 〇6111 '&lt; ^ 64-Mb DRAM ", 1989 Symposium on VLSI Technology Digest of Technical Papers, pp. 69-70. The cylindrical stacked capacitor is mainly its electrodes and dielectric film The layer system extends into a vertical cylindrical structure in order to increase the surface area of the electrode. For the related US patent of the DRAM cylindrical stacked capacitor, reference can be made to No. 5,077,688. As the degree of accumulation continues to increase, the size of the DRAM memory cell will continue to shrink. As known to those skilled in the art, the reduction in the size of the memory cell will reduce the capacitance value of the storage capacitor. The reduction in capacitance value will result in the incidence of alpha rays The chance of soft errors caused by it increases. Therefore, this artist is still 4 (please read the precautions on the back before filling out this page) 丨 Install.
'II Line paper size is applicable to China National Standard (CNS) Λ4 specification (210X297mm) Employee consumption cooperation of the Central Bureau of Standards of the Ministry of Economic Affairs Du Yinxian A7 B7 5. Invention description (3) Constantly looking for new storage capacitor structures and their manufacture As a method, it is hoped that in the case where the plane size occupied by the storage capacitor is reduced, the desired capacitance value can still be maintained. Therefore, a main object of the present invention is to provide a semiconductor memory device having a capacitor, the capacitor having a tree structure to increase the surface area of the storage electrode of the capacitor. According to one feature of the present invention, a semiconductor memory device having a capacitor includes a substrate; a transfer transistor formed on the substrate and including drain and source regions; and a storage capacitor electrically coupled to the transfer circuit One of the drain and source regions of the crystal. The storage capacitor includes a trunk-like conductive layer with a bottom, electrically coupled to one of the drain and source regions of the transfer transistor, and the trunk-like conductive layer has an upward extension to approximate The upward direction extends from the bottom. A type of dendritic upper conductive layer is electrically coupled above the trunk-like conductive layer. At least one kind of dendritic lower conductive layer has an L-shaped cross section, the dendritic lower conductive layer is connected to the lower surface of the dendritic upper conductive layer, the trunk-like conductive layer, the dendritic upper conductive layer , And the dendritic lower conductive layer constitute a storage electrode of the storage capacitor. A dielectric layer is formed on the exposed surface of the trunk-like conductive layer, the dendritic upper conductive layer, and the dendritic lower conductive layer. An upper conductive layer is formed on the dielectric layer to constitute a counter electrode of the storage capacitor. According to a preferred embodiment of the present invention, the storage capacitor includes two substantially parallel dendritic lower conductive layers, each of which has an L-shaped cross-section, and is connected to the lower surface of the dendritic upper conductive layer on. Storage Capacitor 5 This paper scale is applicable to Chinese National Standard (CNS> Λ4 specifications (210X 297mm) ----! --- 1-^ -t --- (please read the precautions on the back before filling this page ) Printed 306036 at _____B7 by the Employees ’Consumer Cooperative of the Central Standards Bureau of the Ministry of Economics. 5. Description of the invention (4) May further include a second type of dendritic conductive layer with an end connected to the outer surface of the trunk-like conductive layer And an outwardly extending portion extending outward from the end in a substantially horizontal direction. The second type of dendritic conductive layer is located below the dendritic lower conductive layer. The dendritic lower conductive layer may have A double L-shaped cross-section. According to another preferred embodiment of the present invention, the dendritic upper conductive layer includes a central portion electrically coupled to the upper surface of the trunk-like conductive layer; and an outwardly extending portion Extends outward from the central portion. The dendritic lower conductive layer includes a first extension connected to the lower surface of the dendritic upper conductive layer, and extends generally downward; and a second extension generally extends from the An extension extends outward The dendritic lower conductive layer may include an inner surface connected to the outer surface of the trunk-like conductive layer. According to another feature of the present invention, a semiconductor memory device having a capacitor includes a substrate; a transfer transistor is formed On the substrate and includes drain and source regions; and a storage capacitor electrically coupled to one of the drain and source regions of the transfer transistor. The storage capacitor includes a type of trunk-like conductive layer with a bottom , Electrically coupled to one of the drain and source regions of the transfer transistor, the trunk-like conductive layer has an upward extension 'extending from the bottom in a generally upward direction. The conductive layer is electrically coupled above the trunk-like conductive layer. The at least one kind of dendritic lower conductive layer includes at least a first extension and a second extension, one end of the first extension is connected to the dendritic-like On the lower surface of the conductive layer, the second extension section extends at an angle from the other end of the first extension section, a trunk-like conductive layer, a dendritic-like upper conductive layer, and a dendritic-like layer (6 scales are applicable to China CNS) Λ4 ^ (2 丨 οκ297 Public Broadcasting) &quot; &quot; (please read the notes on the back and then fill out this page) 1 __ {丨 Installation. -Β Employee Consumer Cooperative of Central Bureau of Standards, Ministry of Economic Affairs Printing A7 B7 5. The lower conductive layer of the invention (5) constitutes a storage electrode of the storage capacitor. —'The dielectric layer is formed on the exposed surface of the trunk-like conductive layer 'dendritic upper conductive layer and the dendritic lower conductive layer. An upper conductive layer is formed on the dielectric layer to constitute an opposite electrode of the storage capacitor. According to yet another preferred embodiment of the present invention, the dendritic lower conductive layer may further include a third extension extending approximately downward from the second extension; and a fourth extension extending approximately outward from the third extension Stretch out. According to yet another feature of the present invention, 'a semiconductor memory device with a capacitor includes a substrate; a transfer transistor' is formed on the substrate and includes a drain and a source region; and a storage capacitor electrically coupled to the transfer One of the drain and source regions of the transistor. The storage capacitor includes a trunk-like conductive layer with a bottom, electrically coupled to one of the drain and source regions of the transfer transistor, and the trunk-like conductive layer has a cylindrical extension to approximate The upward direction extends from the bottom. A type of dendritic upper conductive layer is electrically coupled above the trunk-like conductive layer. At least one of the tree-like lower conductive layers has an end connected to the lower surface of the tree-like upper conductive layer, and the tree-like lower conductive layer has an outwardly extending portion extending outward from the end. The trunk-like conductive layer, the dendritic upper conductive layer 'and the dendritic lower conductive layer constitute a storage electrode of the storage capacitor. A dielectric layer is formed on the exposed surface of the trunk-like conductive layer, the dendritic upper conductive layer, and the dendritic lower conductive layer. An upper conductive layer is formed on the dielectric layer to constitute an opposite electrode of the storage capacitor. According to still another preferred embodiment of the present invention, the outwardly extending portion of the class of dendritic lower conductive layer has a section with a multi-node bending shape. The storage capacitor includes 7 copies of paper. The standard of China's national standard falcon (CNS) A4 (210x297mm) (please read the precautions on the back and then fill out this page) 丨 Printed by the consumer consumption cooperative of the Central Standard Falcon Bureau of the Ministry of Economic Affairs Preparation 306036 V. Description of the invention (6) Several lower dendritic-like conductive layers extending substantially in parallel, one end of each dendritic-like lower conductive layer is connected to the lower surface of the upper dendritic-like conductive layer. According to still another feature of the present invention, 'a semiconductor memory device having a capacitor includes a substrate; a transfer transistor' is formed on the substrate and includes a drain and a source region; and a storage capacitor electrically coupled to the transfer One of the drain and source regions of the transistor. The storage capacitor includes a type of trunk-like conductive layer with a bottom, electrically coupled to one of the drain and source regions of the transfer transistor, and the type of trunk-like conductive layer has an upward extension, with a substantially upward The direction of 'extends from the bottom. The at least one type of dendritic conductive layer includes at least a first extension, a second extension, and a third extension. The first extension is connected to the outer surface of the trunk-like conductive layer, and the second extension is An angle extends from the first extension, and a third extension extends from the second extension at a second angle. The trunk-like conductive layer and the dendritic-like conductive layer constitute a storage electrode of the storage capacitor. A dielectric layer is formed on the exposed surface of the trunk-like conductive layer and the dendritic-like conductive layer. An upper conductive layer is formed on the dielectric layer to constitute an opposite electrode of the storage capacitor. According to still another preferred embodiment of the present invention, the upward extension of the trunk-like conductive layer includes a hollow portion. The trunk-like conductive layer may have a U-shaped profile. The trunk-like conductive layer may include a lower trunk portion electrically coupled to one of the drain and source regions of the transfer transistor; and an upper trunk portion extending from the upper surface of the lower trunk portion and having a similar Shaped profile. The tree-like dendritic conductive layer is connected to the outer surface of the upper trunk. 8 (Please read the precautions on the back before filling in this page). Installed. -Β This paper size is Laizhong Hig Home Transfer (CNS) Λ4 specifications (21Qx 297 public) The Ministry of Economic Affairs Central Standards Bureau employee consumer cooperatives print A7 — ~ ^ V. Description of the invention (7) According to yet another preferred embodiment of the present invention, the trunk-like conductive layer may include the following trunk portion electrically coupled to one of the drain and source regions of the transfer transistor ; And an upper trunk extending from the upper surface of the lower trunk and having a hollow tubular section. The dendritic conductive layer is connected to the outer surface of the upper trunk. According to still another preferred embodiment of the present invention, the trunk-like conductive layer has a T-shaped cross section. The first extension extends substantially from the outer surface of the trunk-like conductive layer, the second extension extends approximately downward from the first extension, and the third extension extends approximately outward from the second extension. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, several preferred embodiments are described below in conjunction with the accompanying drawings, which are described in detail as follows: Brief description of the drawings: Figure 1 It is a circuit diagram of a memory unit of a dram device. Figures 2A to 2G are a series of cross-sectional views for explaining a first preferred embodiment of a method for manufacturing a semiconductor memory device of the present invention, and a first preferred embodiment of a semiconductor memory device of the present invention. Figures 3A to 3D are a series of cross-sectional views for explaining a second preferred embodiment of a method for manufacturing a semiconductor memory device of the present invention, and a second preferred embodiment of a semiconductor memory device of the present invention. 4A to 4C are a series of cross-sectional views for explaining a third preferred embodiment of a method for manufacturing a semiconductor memory device of the present invention, and a third preferred embodiment of a semiconductor memory device of the present invention. Figures 5A to 5C are a series of cross-sectional diagrams used to explain the invention 9 (please read the precautions on the back before filling this page) • Pack · Order
U Applicable to the Chinese National Standard (CNS) A4 specification (2 丨 0X297, Ministry of Economy, Central Standards Bureau, Employee Consumer Cooperative Printed 306036 A7 B7 V. Invention description (8) The fourth preferred embodiment of a semiconductor billion-element manufacturing method 'And a fourth preferred embodiment of a semiconductor memory device of the present invention. Figures 6A to 6D are a series of cross-sectional views for explaining a fifth preferred embodiment of a semiconductor memory device manufacturing method of the present invention, and the present invention A fifth preferred embodiment of a semiconductor memory device of the invention. Figures 7A to 7E are a series of cross-sectional views for explaining a sixth preferred embodiment of a method of manufacturing a semiconductor memory device of the present invention and a type of the present invention The sixth preferred embodiment of the semiconductor memory element! Figures 8A to 8E are a series of cross-sectional views for explaining the seventh preferred embodiment of a method for manufacturing a semiconductor memory element of the present invention, and a semiconductor memory of the present invention The seventh preferred embodiment of the device. Figures 9A and 9B are cross-sectional views for explaining the eighth method of manufacturing a semiconductor memory device of the present invention. A preferred embodiment, and an eighth preferred embodiment of a semiconductor memory device of the present invention. FIGS. 10A to 10E are a series of cross-sectional views for explaining a ninth preferred embodiment of a semiconductor memory device manufacturing method of the present invention , And a ninth preferred embodiment of a semiconductor memory device of the present invention. FIGS. 11A and 11B are cross-sectional views for explaining a tenth preferred embodiment of a method of manufacturing a semiconductor memory device of the present invention, and A tenth preferred embodiment of a semiconductor memory device. Figures 12A to 10C are a series of cross-sectional views for explaining an eleventh preferred embodiment of a method for manufacturing a semiconductor memory device of the present invention and a semiconductor of the present invention The eleventh preferred embodiment of the memory element. Figures 13A and 13B are cross-sectional diagrams used to explain the present invention—a half-size paper scale applicable to the Chinese National Standard (CNS) Α4 specification (2 丨 0 '297 mm ) (Please read the precautions on the back before filling this page) 丨 装 ·
、 1T A7 B7 The Ministry of Economic Affairs Central Standards Bureau Staff Consumer Cooperative Printed the Fifth Invention Description (9) The twelfth preferred embodiment of the conductor memory element manufacturing method and the twelfth preferred embodiment of a semiconductor memory element of the present invention example. Next, with reference to FIGS. 2A to 2G, a first preferred embodiment of a semiconductor memory device having a tree-shaped storage capacitor of the present invention will be described in detail. This preferred embodiment of a semiconductor memory device is a semiconductor memory of the present invention. Manufactured in the first preferred embodiment of the device manufacturing method. Referring to FIG. 2A, first, a surface of a silicon substrate 10 is subjected to a thermal oxidation process, for example, by local oxidation of silicon (LOCOS) technology, thereby forming a field oxide layer 12 having a thickness of about 3000 angstroms, for example. Next, the silicon substrate 10 is subjected to a thermal oxidation process to form a gate oxide layer 14 having a thickness of, for example, about 150 angstroms. Then, using a CVD (chemical oxygen phase deposition) or LPCVD (low pressure CVD) method, a polycrystalline silicon layer is deposited on the entire surface of the silicon substrate 10, with a thickness of, for example, about 2000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer, phosphorus ions can be implanted into the polycrystalline silicon layer. Preferably, a refractory metal layer can be deposited, and then an annealing step is performed to form a metal polycide compound layer to further increase its conductivity. The refractory metal may be, for example, tungsten (Tungsten), and the deposited thickness is, for example, about 2000 angstroms. Afterwards, the metal polycrystalline silicon compound layer is defined using traditional photolithography and patterning techniques, thereby forming gates (or word lines) WL1 to WL4 as shown in FIG. 2A. Next, for example, arsenic ions are implanted into the silicon substrate 10 to form drain regions 16a and 16b and source regions 18a and 18b. In this step, the word lines WL1 to WL4 are used as the mask layer 'and the dose of ion implantation is, for example, about 1 X 1015 atoms / cm2, which can be applied to the Chinese National Standards (CNS) Λ4 specifications at this paper scale ( 210X 297mm) (Please read the precautions on the back before filling out this page) ”丨 Installation-A7 B7 printed by the Staff Cooperative of the Central Standards Bureau of the Ministry of Economics. The description of invention (ίο) is about 70KeV. Please refer to FIG. 2B. Then, a planarized insulating layer 20 is deposited by CVD, such as BPSG (borophosphosilicate glass), with a thickness of about 7000 angstroms. Then, an etching protection layer (etching protection layer) 22, which is, for example, a silicon nitride layer, with a thickness of about 1000 angstroms, is deposited by CVD. After that, the etching mask layer 22 and the planarization insulating layer 20 are sequentially etched using conventional photomask patterning and uranium engraving techniques to form storage electrode contact holes 24a and 24b, which are respectively protected by etching The upper surface of the layer 22 extends to the surfaces of the drain regions 16a and 16b. Next, a thick polycrystalline silicon layer is deposited with a thickness of, for example, about 7000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer, for example, arsenic ions can be implanted into the polycrystalline silicon layer. Then use the traditional mask patterning and etching technology to define the polysilicon layer, thus forming a polysilicon pillar (polysilicon pillar) 26a; 26b as shown in Figure 2B. The columnar polycrystalline sand layers 26a; 26b extend from the surfaces of the drain regions 16a and 16b through the storage electrode contact windows 24a and 24b, respectively, and a notch 25 is formed therebetween. Please refer to FIG. 2C, and then sequentially deposit an insulating layer 28, a polycrystalline silicon layer 30, and an insulating layer 32 by CVD. The insulating layers 28 and 32 are, for example, silicon dioxide, and the thickness of the insulating layer 28 and the polycrystalline silicon layer 30 are, for example, about 1000 angstroms, and the thickness of the insulating layer 32 should be at least sufficient to fill the columnar polycrystalline silicon layer 26a; 26b. In this preferred embodiment, the thickness of the insulating layer 32 is, for example, about 7000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer 30, for example, arsenic ions can be implanted into the polycrystalline silicon layer 30. Please refer to Figure 2D, and then use mechanical chemical formula grinding (chemical 12 paper standard for China National Standards (CNS) Λ4 specifications (210X 297 mm) ~ (please read the precautions on the back and fill in this page) k. Installation-11 lines Α7 Β7 Printed by the Consumer Consumer Cooperative of the Central Standardization Bureau of the Ministry of Economic Affairs i. Invention description (11) mechanical polish; CMP) technology to polish the surface of the 2C figure structure, at least until the columnar polycrystalline silicon layer 26a And the upper part of 26b is exposed. Please refer to FIG. 2E, and then deposit a polycrystalline silicon layer 34 with a thickness of, for example, about 1000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer 34, for example, arsenic ions can be implanted into the polycrystalline silicon layer 34. Then, the polycrystalline silicon layer 34, the insulating layer 32, and the polycrystalline sand layer 30 are sequentially etched using conventional photomask patterning and etching techniques to define the storage electrodes of the storage capacitors of the memory cells. That is, by this step, the polycrystalline silicon layers 34 and 30 are cut into sections 34a; 34b and 30a; 30b. Please refer to table 2F, the contact adopts the wet touch etching method, and the etching protection layer 22 is used as the etching end point to remove the exposed silicon dioxide layer, that is, the insulating layers 32 and 28 are removed. By this step, the storage electrode of the storage capacitor of the dynamic random access memory is completed, which is shown as a trunk-like polycrystalline sand layer 26a, 26b, a dendritic upper polycrystalline sand layer 34a; 34b, and having The lower dendrite-like silicon layer 30a; 30b of a profile-like profile is formed together. The trunk-like polycrystalline silicon layer 26a; 26b is connected to the drain region 16a; 16b of the transfer transistor of DRAm. The dendritic upper polycrystalline silicon layer 34a; 34b is connected and extends above the trunk-like polycrystalline sand layer 26a; 26b. The dendrite-like lower polycrystalline sand layer 30a; 30b then extends from the lower surface of the dendritic-like upper polycrystalline sand layer 34a; 34b in a vertical direction at a certain distance, and then extends in a horizontal direction. Since the shape of the storage electrode of the present invention is very special, it is referred to as a "tree-shaped storage electrode" in this specification, and the resulting capacitor is referred to as a "tree-shaped storage capacitor". Please refer to Figure 2G, and then at the storage electrodes 26a, 30a, 34a; and 26b, the paper size is applicable to China National Standard (CNS) Λ4 specification (210κ297 Gongjie) (please read the precautions on the back before filling this page) k_ Installation-,-= * 1 Line A7 B7 printed by employees ’consumer cooperatives of the Central Standardization Bureau of the Ministry of Economic Affairs. 5. Description of the invention (12) A dielectric film layer 36a; 36b is formed on the surfaces of 30b and 34b respectively. The dielectric film layer 36a; 36b can be, for example, a silicon dioxide layer, a silicon nitride layer, an NO (silicon nitride / silicon dioxide) structure, a ΝΝΟ (silicon dioxide / silicon nitride / silicon dioxide) structure, or any Similar. Then, on the surfaces of the dielectric film layers 36a and 36b, the counter electrode 38 made of polycrystalline silicon is formed. The process of the counter electrode can be achieved by the following steps: depositing a polycrystalline silicon layer with a thickness of, for example, 1000 Angstroms by CVD; then doping with, for example, N-type impurities to improve its conductivity; The etching technology defines the polycrystalline silicon layer to complete the storage capacitor of each memory cell of the DRAM. Although the 2G picture is not shown, those familiar with this art should understand that the structure of the 2G picture can be made according to the traditional process technology of bit lines, bonding pads, interconnection wires, and isolation protection layers (passivation) , And packaging, etc. to complete the DRAM integrated circuit. Since these processes are not related to the features of the present invention, they will not be repeated here. In this preferred embodiment, the storage electrode has only one layer of dendritic electrode layer like L-shaped cross-section. However, the present invention is not limited to this. The number of dendrite-like electrode layers having an L-shaped cross section of the storage electrode may be two, three, or more. The next preferred embodiment will describe a storage electrode having a dendritic-like electrode layer having two L-shaped cross sections. Next, the second preferred embodiment of a semiconductor memory device with a tree-shaped storage capacitor of the present invention will be described in detail with reference to the 3A to 3D _ 'This preferred embodiment of a semiconductor memory device' is a semiconductor The second more manufacturing method of the memory device manufacturing method. This preferred embodiment is based on the structure of the preferred embodiment shown in No. 2B _ (please read the precautions on the back and then fill out this page) 丨 Installation_ The size of the paper is applicable to China National Standard (CNS) Λ4 specifications ( 210/20 / 々 Yu) A7 B7 printed and printed by the Consumer Cooperative of the Central Standard Falcon Bureau of the Ministry of Economic Affairs. 5. Description of the invention (13). DRAM storage electrodes with different structures are then produced by different processes. In Figures 3A to 3D, parts similar to those in Figure 2B are marked with the same numbers. Please refer to FIGS. 2B and 3A, and then alternately deposit an insulating layer and a polycrystalline silicon layer by CVD, that is, sequentially deposit an insulating layer 40, a polycrystalline silicon layer 42, and an insulating layer 44, as shown in FIG. 3A. A polycrystalline silicon layer 46 and an insulating layer 48. The insulating layers 40, 44 and 48 are, for example, silicon dioxide, and the thickness of the insulating layers 40; 44 and the polycrystalline silicon layer 42; 46 are, for example, about 100 angstroms, and the thickness of the insulating layer 48 is, for example, about 7000. Egypt. In order to improve the conductivity of the polycrystalline silicon layer, for example, arsenic ions can be implanted into the polycrystalline silicon layer. Please refer to FIG. 3B, and then use the CMP technique to polish the surface of the structure in FIG. 3A until at least the portions above the columnar polycrystalline silicon layers 26a and 26b are exposed. Please refer to FIG. 3C again, and then deposit a polycrystalline silicon layer 50 with a thickness of, for example, about 1000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer 50, for example, arsenic ions may be implanted into the polycrystalline silicon layer 50. Then, using conventional photomask patterning and etching techniques, the polycrystalline silicon layer 50, the insulating layer 48, the polycrystalline silicon layer 46, the insulating layer 44 'and the polycrystalline silicon layer 42 are sequentially etched to define the storage of each memory cell The storage electrode of the capacitor. That is, by this step, the polycrystalline silicon layers 42, 46 and 50 are cut into sections 42a; 42b, 46a; 46b and 50a; 50b. Then, the wet etching method is used, and the etching protection layer 22 is used as the etching end point to remove the exposed silicon dioxide layer, that is, the insulating layer 40, 44 and 48 ° is removed. This step completes the dynamic random access memory As shown in Figure 3C, the storage electrode of the storage capacitor is composed of a trunk-like polycrystalline silicon layer 26a; the paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 Gongchu) (please read the back (Notes to fill out this page)-installed-306036 A7 B7 V. Description of the invention (14) 26b, dendrite-like upper polycrystalline silicon layer 50a; 50b, and a dendritic-like two-layered layer with an L-shaped profile The polycrystalline silicon layers 42a, 46a; 42b, 46b are formed together. The trunk-like polycrystalline silicon layer 26a; 26b is connected to the drain region 16a; 16b of the transfer transistor of the DRAM. The dendritic upper polycrystalline sand layer 50a; 50b is connected and extends above the trunk-like polycrystalline silicon layer 26a; 26b. The dendrite-like two-layer lower polycrystalline silicon layers 42a, 46a; 42b, 46b respectively extend from the lower surface of the dendritic-like upper polycrystalline silicon layers 34a; 34b in a vertical direction at a distance, and then It extends approximately horizontally. Please refer to FIG. 3D, and then form a dielectric film layer 52a; 52b on the surfaces of the storage electrodes 26a, 42a, 46a, 50a; and 26b, 42b, 46b, 50b, respectively. Then, on the surfaces of the dielectric film layers 52a and 52b, the counter electrode 54 made of polycrystalline silicon is formed. The process of the counter electrode can be achieved by the following steps: depositing a polycrystalline silicon layer with a thickness of, for example, 1000 Angstroms by CVD; then doping with, for example, N-type impurities to improve its conductivity; and finally using traditional mask making and lithography techniques The polysilicon layer is defined to complete the storage capacitors of the DRAM memory cells. In the above-mentioned first and second preferred embodiments, there is a distance between the lower surface of the dendritic electrode layer at the bottom of the storage electrode and the etching protection layer 22, and there is no direct contact. However, the present invention is not limited to this, and the next preferred embodiment will describe a storage electrode structure in which the lower surface of the lowermost dendritic electrode layer directly contacts the etching protection layer 22. Next, with reference to FIGS. 4A to 4C, a third preferred embodiment of a semiconductor memory device having a tree-shaped storage capacitor of the present invention will be described in detail. This preferred embodiment of a semiconductor memory device is a semiconductor memory of the present invention. The third preferred embodiment of the device manufacturing method is manufactured. (Please read the notes on the back before filling this page)
Ik • Installed. -Β .1 Printed by the Employee Consumer Cooperative of the Central Standard Falcon Bureau of the Ministry of Economic Affairs ^ This paper scale is applicable to the Chinese National Standard (CNS) Α4 specification (210Χ 297 mm) A7 DuPont Printed by the Employees ’Consumption Cooperation of the Central Standard Bureau of the Ministry of Economic Affairs B7 5. Description of the invention (15) This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 2B, and then DRAM storage electrodes with different structures are manufactured by different processes. In Figures 4A to 4C, parts similar to those in Figure 2B are marked with the same numbers. Referring to FIGS. 2B and 4A, a polycrystalline sand layer 56, an insulating layer 58, a polycrystalline sand layer 60, and an insulating layer 62 are sequentially deposited by CVD. Please refer to FIG. 4B, and then use the CMP technique to polish the surface of the structure of FIG. 4A at least until the lowest polycrystalline silicon layer 56 above the columnar polycrystalline silicon layers 26a and 26b is exposed. Alternatively, the portion above the columnar polycrystalline silicon layers 26a and 26b may be exposed. Please refer to FIG. 4C again, after depositing a polycrystalline silicon layer 64, the storage electrode of the storage capacitor of each memory cell is defined using traditional photomask patterning and etching techniques. That is, by this step, the polycrystalline silicon layers 56, 60 and 64 are cut into several sections 56a; 56b, 60a; 60b and 64a; 64b. Then, the wet etching method is used, and the etching protection layer 22 is used as the etching end point, and the exposed silicon dioxide layer is removed, that is, the insulating layers 58 and 62 ° are removed. In this step, the storage capacitor of the dynamic random access memory is completed The storage electrode, as shown in FIG. 4C, is composed of a trunk-like polycrystalline silicon layer 26a; 26b ′ dendritic upper polycrystalline silicon layer 64a; 64b, and a dendritic-like two with an L-shaped cross section The underlying polycrystalline silicon layers 56a, 60a; 56b, 60b are formed together. The trunk-like polycrystalline silicon layer 26a; 26b is connected to the drain region 16a; 16b of the transfer transistor of the DRAM. The dendritic upper polycrystalline silicon layer 64a; 64b is connected and extends above the trunk-like polycrystalline silicon layer 26a; 26b. The dendrite-like two-layer polycrystalline silicon layer 56a, 60a; 56b, 60b respectively apply the Chinese National Standard (CNS) Λ4 specification (210X 297 public) from the dendrite-like 17 ______ _____ ^ 'Zhang scale (please hear first Read the precautions on the back and then fill out this page) L, Pack. Order. 1 A7 B7 printed and printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. The upper polycrystalline silicon layer 64a; 64b the lower surface of the invention description (16), First extend a distance downward in the vertical direction and then extend it in the horizontal direction. The dendritic lower polycrystalline silicon layer is closer to the trunk-like polycrystalline silicon layer 26a; 26b (ie, 56a and 56b), and its inner surface is in direct contact with the trunk-like polycrystalline silicon layer 26a; 26b, and the lower The surface is in direct contact with the etching protection layer 22, thus forming a structure different from the above two preferred embodiments. The fourth preferred embodiment below will also describe the storage electrode structure where the lower surface of the lowermost dendritic electrode layer directly contacts the etching protection layer 22. The fourth preferred embodiment uses a manufacturing method different from the third preferred embodiment to achieve a similar structure. Next, referring to FIGS. 5A to 5C, a fourth preferred embodiment of a semiconductor memory device having a tree-shaped storage capacitor of the present invention will be described in detail. This preferred embodiment of a semiconductor memory device is a semiconductor memory of the present invention. The fourth preferred embodiment of the device manufacturing method. This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 2B, and then DRAM storage electrodes with different structures are manufactured by different processes. In Figures 5A to 5C, parts similar to those in Figure 2B are marked with the same numbers. Please refer to FIGS. 2B and 5A, and then on the sidewalls of the columnar polycrystalline silicon layers 26a and 26b, insulating spacers 66a and 66b are formed, respectively. The side walls 66a and 66b are, for example, silicon dioxide layers, and can be achieved by the following steps: a silicon dioxide layer is deposited by CVD with a thickness of, for example, 1000 angstroms; and then etch back to form the side walls. Then, in order to deposit a polycrystalline silicon layer 68, an insulating layer 70, and a polycrystalline f in order by CVD method, please read the precautions on the back and then fill in this page j .; __c 丨 Installation. Order_line_ Applicable to Chinese National Standards (CNS) A4 specification (210X 297mm) A7 A7 Central Government Bureau of Economics and Staff of the Ministry of Economic Affairs, consumer cooperation, thorium printing ________B7 V. Description of invention (η) Sand layer 72, and an insulating layer 74. Please refer to FIG. 5B, and then use the CMP technique to polish the surface of the structure of FIG. 5A at least until the lowest polycrystalline silicon layer 68 above the columnar polycrystalline silicon layers 26a and 26b is exposed. Alternatively, the portion above the columnar polycrystalline silicon layers 26a and 26b may be exposed. Please refer to FIG. 5C again. After depositing a polycrystalline silicon layer 76, the storage electrodes of the storage capacitors of each billion-unit are defined using traditional photomask patterning and etching techniques. That is, by this step, the polycrystalline silicon layers 68, 72 and 76 are cut into sections 68a; 68b, 72a; 72b and 76a; 76b. Then, the wet etching method and the etching protection layer 22 are used as the etching end point to remove the exposed silicon dioxide layer, that is, the insulating layers 70 and 74 are removed. By this step, the storage electrode of the storage capacitor of the dynamic random access memory is completed, as shown in FIG. 5C, which is composed of a trunk-like polycrystalline silicon layer 26a; 26b, a dendritic upper polycrystalline silicon layer 76a; 76b, and two dendrite-like two-layer lower polycrystalline silicon layers 68a, 72a and L-shaped cross-sections are formed together. The trunk-like polycrystalline silicon layer 26a; 26b is connected to the drain region 16a; 16b of the transfer transistor of the DRAM. The dendritic upper polycrystalline silicon layer 76a; 76b is connected and extends above the trunk-like polycrystalline silicon layer 26a; 26b. The dendrite-like two-layer lower polycrystalline silicon layers 68a, 72a; 68b, 72b respectively extend from the lower surface of the dendritic-like upper polycrystalline silicon layers 76a; 76b in a vertical direction downward, and then It extends approximately horizontally. The dendrite-like lower polymorphic sands are closer to the trunk-like polycrystalline silicon layer 20a; 26b (ie 72a and 72b) 'whose inner surface is isolated from the trunk-like polycrystalline silicon layer 26a; the outer surface of 26b Side wall insulation layer 66a; 66b, and the lower surface is directly connected to the etching protection layer 22-^-(please read the precautions on the back before filling this page) Order ^ China National Building Rate (CNS) Λ4 specifications (210 X 297 Mm) 306036 A7 B7 Printed garments of the Employees ’Consumer Cooperative of the Central Standard Falcon Bureau of the Ministry of Economic Affairs V. Description of the invention (18) Contact, thus forming a different structure from the above preferred embodiment. The following fifth preferred embodiment uses different manufacturing methods to form the inner surface of the bottom dendritic electrode layer directly in contact with the outer surface of the trunk-like polycrystalline silicon layer, but the lower surface is not in direct contact with the etching protection layer Different storage electrode structures in contact. Next, referring to FIGS. 6A to 6D, a fifth preferred embodiment of a semiconductor memory device with a tree-shaped storage capacitor of the present invention will be described in detail. This preferred embodiment of a semiconductor memory device is a semiconductor memory device of the present invention. The fifth preferred embodiment of the memory element manufacturing method is manufactured. This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 2A, and then DRAM storage electrodes with different structures are fabricated by different processes. In Figures 6A to 6D, parts similar to those in Figure 2A are marked with the same numbers. Please refer to FIGS. 2A and 6A, and then deposit a planarized insulating layer 80 by CVD, such as BPSG. Then, an etch protection layer 82 is deposited by CVD, which is, for example, a silicon nitride layer. Then, an insulating layer 84 is deposited by CVD, which is, for example, silicon dioxide, and has a thickness of about 1000 angstroms, for example. Next, using conventional photomask patterning and etching techniques, the silicon dioxide layer 84, the etching protection layer 82 and the planarization insulating layer 80 are sequentially etched to form the storage electrode contact windows 85a and 85b, which are respectively composed of the silicon dioxide layer The upper surface of 84 extends to the surfaces of the drain regions 16a and 16b. Next, a thick layer of polycrystalline sand is deposited with a thickness of, for example, about 7000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer, for example, arsenic ions can be implanted into the polycrystalline silicon layer. Then use the traditional mask making and etching techniques to define the polysilicon layer, thus forming a columnar polycrystal as shown in Figure 6A 20 (please read the precautions on the back before filling this page)
U I installed.
.1T line This paper's thick scale is applicable to the Chinese National Standard (CNS) Λ4 specification (2 mm x 297 mm) A7 B7 Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of invention (19) Silicon layer 86a; 86b. The columnar polycrystalline silicon layers 86a; 86b extend substantially upward from the surfaces of the drain regions 16a and 16b via the storage electrode contact windows 85a and 85b, respectively. Referring to FIG. 6B, a polycrystalline silicon layer 88, an insulating layer 90, a polycrystalline silicon layer 92, and an insulating layer 94 are sequentially deposited by CVD. Please refer to FIG. 6C, and then use the CMP technique to polish the surface of the structure in FIG. 6B until the portions above the columnar polycrystalline silicon layers 86a and 86b are exposed. Alternatively, only the lowest polycrystalline silicon layer 88 positioned above the columnar polycrystalline silicon layers 86a and 86b may be exposed. Please refer to FIG. 6D again, and after depositing a polycrystalline silicon layer 96, the storage electrode of the storage capacitor of each memory cell is defined by using traditional photomask patterning and etching techniques. That is, by this step, the polycrystalline silicon layers 88, 92 and 96 are cut into sections 88a; 88b, 92a; 92b and 96a; 96b. Then, the wet etching method and the etching protection layer 82 are used as the etching end point to remove the exposed silicon dioxide layer, that is, the insulating layers 94, 90 and 84 are removed. By this step, the storage electrode of the storage capacitor of the dynamic random access memory is completed, as shown in FIG. 6D, which is composed of a trunk-like polycrystalline silicon layer 86a; 86b, a dendritic upper polycrystalline silicon layer 96a; 96b, and a dendritic two-layer lower polycrystalline silicon layer 88a, 92a; 88b, 92b with an L-shaped cross section. A trunk-like polycrystalline silicon layer 86a; 86b is connected to the drain region 16a; 16b of the transfer transistor of the DRAM. The dendritic upper polycrystalline silicon layer 96a; 96b is connected and extends above the trunk-like polycrystalline silicon layer 86a; 86b. The dendritic two-layer lower polycrystalline silicon layers 88a, 92a; 88b, 92b respectively extend downward from the lower surface of the dendritic upper polycrystalline silicon layer 96a; 96b in approximately vertical direction (please read the back Please pay attention to this page and then fill out this page) —i Packing. Stranding ---- This paper standard is applicable to China National Standard Falcon (CNS) Λ4 specifications (210X 297mm) A7 ____ printed by the Employee Consumer Cooperative of the Central Standard Falcon Bureau of the Ministry of Economic Affairs B7 V. Description of the invention (20) After extending a certain distance, it will extend in a horizontal direction. The dendritic lower polycrystalline silicon layer is closer to the trunk-like polycrystalline silicon layer 86a; 86b (ie 88a and 88b), the inner surface of which is connected to the outer surface of the trunk-like polycrystalline silicon layer 86a; 86b, The lower surface is kept at a distance from the etching protection layer 82, thus forming a storage electrode structure different from the above preferred embodiment. In the first to fifth preferred embodiments described above, the dendritic electrode layer of the storage electrode is a two-section bending member having an L-shaped cross section. However, the present invention is not limited to this, and the number of nodes formed by bending the dendritic electrode layer may be three nodes, four nodes, or more. The next preferred embodiment will describe a storage electrode in which the tree-like dendritic electrode layer has a four-node structure. Next, referring to FIGS. 7A to 7E, a sixth embodiment of a semiconductor memory device with a tree-shaped storage capacitor of the present invention will be described in detail. This preferred embodiment of the semiconductor memory device is a semiconductor memory device of the present invention. Manufactured in the sixth preferred embodiment of the device manufacturing method. This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 2A, and then DRAM storage electrodes with different structures are fabricated by different processes. In Figures 7A to 7E, parts similar to those in Figure 2A are marked with the same numbers. Please refer to FIGS. 7A and 2A. Next, a planarized insulating layer 98, for example BPSG, is deposited by CVD. Then, an etch protection layer 100, such as a silicon nitride layer, is deposited by CVD. Then, using conventional photomask patterning and etching techniques, the etching protection layer 100 and the planarization insulating layer 98 are sequentially etched to form storage electrode contact windows i〇2a and 102b, which extend from the upper surface of the etching protection layer 100, respectively The 22 sheets of paper in the Jiji area 16a and 16b are suitable for Chinese hoarding standards (CNS) Λ4 specifications (210X297mm) (please read the precautions on the back before filling this page)
K binding line --- A7 B7 Printed and printed by the employee consumer cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Invention description (21) Surface. Next, a thick polycrystalline silicon layer is deposited with a thickness of, for example, about 7000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer, for example, arsenic ions can be implanted into the polycrystalline silicon layer. Then, a photoresist layer 106 is formed by using the conventional mask patterning technology, and the exposed polycrystalline silicon layer is anisotropically etched, thereby forming raised polycrystalline silicon layers 104a and 104b as shown in the figure. The raised polycrystalline silicon layers i〇4a; l〇4b extend from the surfaces of the drain regions 16a and 16b through the storage electrode contact windows 102a and 102b, respectively, generally upward. Please refer to FIG. 7B, and then the photoresist erosion technique is used to remove the photoresist layer 106-thickness to form a thinner and smaller photoresist layer 106a, thereby exposing the raised polycrystalline sand layer i〇4a and Part of the upper surface of i〇4b. Please refer to FIG. 7C again, and then anisotropically etch the raised upper surface portions of the polycrystalline silicon layers 104a and 104b and the remaining polycrystalline sand layer until the etching protection layer 100 is exposed to form Stepped columnar polycrystalline silicon layers 104c and 104d structure. Finally, remove the photoresist. Please refer to Figure 7D 'and follow the similar steps described above for Figures 2C and 2D to complete the structure shown in Figure 7D. That is, an insulating layer 108, a polycrystalline silicon layer 110, and an insulating layer 112 are sequentially deposited by the CVD method. Next, the surface of the structure is polished at least until the surfaces above the columnar polycrystalline silicon layers 104c and 104d are exposed using mechanochemical polishing technology. Please refer to Table 7E again, and then deposit a polycrystalline sand layer Π4, the thickness of which is about 1000 angstroms, for example. In order to improve the conductivity of the polycrystalline sand layer 114, for example, arsenic ions may be implanted into the polycrystalline silicon layer 114. Then, use the traditional photomask 23. The paper size is applicable to the Chinese National Standard Falcon (CNS) Λ4 specification (210 X 297 public voices) (please read the precautions on the back before filling out this page) ί • Install. * 1Τ Line A7 B7 Printed by the Ministry of Economic Affairs, Central Standard Falcon Bureau Consumer Cooperative V. Invention description (22) Plate-making and etching technology, sequentially etching the polycrystalline silicon layer Π4, the insulating layer 112, and the polycrystalline silicon layer 110 'to define the memory cells The storage electrode of the storage capacitor. That is, by this step, the polycrystalline silicon layers 114 and 110 are cut into sections 114a; U4b and 110a; ll〇b. Then, using the wet etching method and using the etching protection layer 100 as the etching end point, the exposed silicon dioxide layer is removed, that is, the insulating layers 112 and 108 are removed. By this step, the storage electrode of the storage capacitor of the dynamic random access memory is completed, as shown in FIG. 7E, which is composed of a trunk-like polycrystalline silicon layer l04c; l〇4d, a dendritic upper polycrystal The silicon layer 114a; 114b, and the lower dendrite-like lower polycrystalline silicon layer 110a; 110b having a four-node bend-shaped cross section (or double L-shaped cross section). The trunk-like polycrystalline silicon layer 104c; 104d is connected to the drain region 16a; 16b of the transfer transistor of the DRAM. The dendritic upper polycrystalline silicon layer 114a; U4b is connected and extends above the trunk-like polycrystalline silicon layer 104c; 104d. The dendrite-like lower polycrystalline silicon layer UOa; 110b is from the lower surface of the dendritic-like upper polycrystalline silicon layer 114a; 114b, firstly extending downward in a vertical direction for some distance, and then extending another segment in a horizontal direction The distance then extends downward in the approximately vertical direction and finally extends in the approximately horizontal direction. According to the conception of this preferred embodiment, to fabricate more sections of the dendritic polycrystalline silicon layer structure, the structure of Figures 7B and 7C can be used as the basis, followed by the photoresist etching step and the raised polycrystalline silicon layer. The time-controlled non-isotropic etching step is performed one or more times to form a more stepped columnar polycrystalline silicon layer structure. In the above first to sixth preferred embodiments, the other polycrystalline silicon layer above the columnar polycrystalline silicon layer is cut by using CMP technology. Ran 24 (please read the precautions on the back before filling in this page)-installed., Ιτ line paper size is applicable to China National Standards (CNS) Α4 specifications (21〇297297 mm) A7 B7 employees of the Central Standard Falcon Bureau of the Ministry of Economic Affairs Printed by the consumer cooperative V. Description of the invention (23) However, the present invention is not limited to this. The next preferred embodiment will describe the use of traditional mask making and hungry engraving technology. The process of cutting other polysilicon layers' and the resulting different storage electrode structures. Next, the seventh preferred embodiment of a semiconductor memory device having a tree-shaped storage capacitor of the present invention will be described in detail with reference to FIGS. 8A to 8E. This preferred embodiment of a semiconductor memory device is a semiconductor memory of the present invention. The seventh preferred embodiment of the device manufacturing method is manufactured. This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 2B, and then DRAM storage electrodes with different structures are manufactured by different processes. In Figs. 8A to 8E, the parts similar to those in Fig. 2B are marked with the same numbers. Please refer to FIGS. 8A and 2B. Then, an insulating layer and a polycrystalline silicon layer are alternately deposited by CVD, that is, an insulating layer 116 and a polycrystalline sand layer 118 ′ are sequentially deposited as shown in FIG. 8A—the insulating layer 120′— Polycrystalline sand layer 122 'and an insulating layer 124. The insulating layers 116, 120, and 124 are, for example, silicon dioxide, and the thickness of all the insulating layers and the polycrystalline silicon layer are, for example, about 1000 angstroms. In order to improve the conductivity of polycrystalline silicon, for example, arsenic ions can be implanted into the polycrystalline silicon layer. Please refer to FIG. 8B, and then, a photoresist layer 126 is formed by using the conventional mask-making technology, and the uncovered etched U2 layer, polycrystalline silicon layer 122, and silicon dioxide are sequentially anisotropically etched. The layer Π0, the polycrystalline silicon layer 118, and the silicon dioxide layer U6 expose the upper surfaces of the columnar polycrystalline silicon layers 26a and 26b. In this step, contact windows 128a and 128b are formed, which extend from the upper surface of the insulating layer 124 to the columnar polycrystalline silicon layers 26a and 26b above Table 25 (please read the precautions on the back before filling this page) • Install ', βτ lit · nn —nwv this paper (CNS) M specification (2 丨 ⑽297 Gongmeng Ministry of Economic Affairs Central Standards Bureau negative work consumer cooperation Du Yinju A7 B7 Fifth, invention description (24). The insulating layers 116, 120, 124 and the polycrystalline sand layer 118, Π2 above the columnar polycrystalline sand layers 26a and 26b are cut. Finally, the photoresist is removed. Please refer to FIG. 8C, and then deposit a polycrystalline silicon layer 13〇, 塡Full contact windows 128a and 128b. The polycrystalline silicon layer 130 is then defined using conventional photomask patterning and etching techniques to form upper trunk portions 130a and 130b connected to the columnar polycrystalline silicon layers 26a and 26b, respectively. Preferably here In an embodiment, the upper trunk portions 130a and 130b of the storage electrode have a T-shaped cross-section. According to another preferred embodiment, a "refill" polycrystalline silicon layer can also be used into the contact windows 128a and 128b " The columnar upper trunk part is formed. This polycrystalline sand layer heavy process can be deposited by CVD method A polycrystalline silicon layer is etched back again. According to another preferred embodiment, a polycrystalline silicon layer may also be deposited, which is not filled with the contact windows 128a and 128b, but only formed on the inner wall of the contact window. Traditional photomask patterning and lithography techniques define a polycrystalline sand layer to form a trunk portion with U. Please refer to Figure 8D 'and then use traditional photomask patterning and etching techniques to sequentially insulate the insulating layer 124 and complex The crystal sand layer 122, the insulating layer 120, and the polycrystalline sand layer 118 ′ define the storage electrodes of the storage capacitors of the memory cells. That is, the polycrystalline silicon layers 118 and 122 are cut into several sections 118a; 118b 122a; 122b. Please refer to FIG. 8E again. Then, the wet etching method is used, and the etching protection layer 22 is used as the etching end point, and the exposed silicon dioxide layer is removed, that is, the insulating layers 124, 120, and 116 are removed. By this step, the storage electrode of the storage capacitor of the dynamic random access memory is completed, as shown in FIG. 8E, which is composed of a trunk-like lower polycrystalline silicon layer 26a; 26b, a trunk-like upper polycrystalline silicon layer 130a ; 26 (please read the notes on the back before filling This page) -9 This paper wave scale is applicable to the Chinese national standard falcon ^ Yang ^ material see grid ^ (1 ^ "mm)) 306036 Central Falcon Bureau of the Ministry of Economic Affairs X. Printed by the Consumer Cooperative Fifth, Invention Instructions (25) 130b, and has The two-layer dendrite-like polycrystalline silicon layers 118a, 122a; 118b, 122b of three-section bend-shaped cross-section are formed together. The trunk-like lower polycrystalline silicon layer 26a; 26b is connected to the drain region 16a of the DRAM transfer transistor ; 16b. The trunk-like upper polycrystalline silicon layer 130a; 130b is connected above the trunk-like polycrystalline silicon layer 26a; 26b. The two-layer dendritic polycrystalline silicon layers 118a, 122a; 118b, 122b extend from the outer surface of the trunk-like upper polycrystalline silicon layer 130a; 130b, extending a distance approximately horizontally and then approximately vertically Extend downward a distance, and finally extend outward in about horizontal direction. In the next preferred embodiment, storage electrodes of different structures are formed by different processes. The storage electrode structure of this preferred embodiment is very similar to that of the seventh preferred embodiment described above, with the only difference being that the upper trunk portion is hollow. Next, referring to FIGS. 9A and 9B, an eighth preferred embodiment of a semiconductor memory device having a tree-shaped storage capacitor of the present invention will be described in detail. This preferred embodiment of the semiconductor memory device is a semiconductor memory of the present invention. The eighth preferred embodiment of the device manufacturing method. This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 8B, and then DRAM storage electrodes with different structures are manufactured by different processes. In Figs. 9A and 9B, the parts similar to those in Fig. 8B are marked with the same numbers. Please refer to FIGS. 9A and 8B, and then deposit a polycrystalline silicon layer by CVD, and then etch back to form side-wall spacers 132a and 132b on the inner walls of the contact windows 128a and 128b ° The side walls 132a and 132b of the polycrystalline sand layer constitute the upper trunk part, which are respectively connected to the columnar polycrystalline silicon layer 26a (please read the precautions on the back before filling this page)
J. installed ·, • 11 'line is applicable to the Chinese national standard (CNS> M specifications (2 丨 0X297 Public Ministry of Economy Central Standards Bureau M industrial consumer cooperatives printed A7 B7 V. Invention description (26) and the upper surface of 26b, Moreover, it has a U-shaped cross-section to increase the surface area of the storage electrode. Please refer to FIG. 9B again, and then etch the insulating layer 124, the polycrystalline silicon layer 122 ′, the insulating layer 120, and the like sequentially using conventional photomask patterning and etching techniques And the polycrystalline silicon layer 118 to define the storage electrodes of the storage capacitors of each memory cell. That is, the polycrystalline silicon layers Π8 and 122 are cut into sections 118a; 118b and 122a; 122b by this step. Etching method, and using the etching protection layer 22 as the etching end point, the exposed silicon dioxide layer is removed, that is, the insulating layers 124, 120 and Π6 are removed. This step completes the storage of the storage capacitor of the dynamic random access memory The electrode, as shown in FIG. 9B, is composed of a trunk-like lower polycrystalline silicon layer 26a; 26b, a trunk-like upper polycrystalline silicon layer 132a; 132b, and a two-layer dendritic-like tree with a three-section bent section Polycrystalline silicon layer 118a, 122a; 118b, 1 22b together. The storage electrode structure of the preferred embodiment shown in FIG. 9B is the only difference from that shown in FIG. 8E, only the trunk-like upper polycrystalline silicon layer 132a; 132b and 130a; 130b have a different structure In the next preferred embodiment, a storage electrode structure similar to the preferred embodiment shown in FIG. 8E is formed by different processes. Next, referring to FIGS. 10A to 10E, a tree-shaped storage according to the present invention will be described in detail. The ninth preferred embodiment of the semiconductor memory element of the capacitor, and this preferred embodiment of the semiconductor memory element is manufactured by the ninth preferred embodiment of a method for manufacturing a semiconductor memory element of the present invention. It is based on the structure of the preferred embodiment shown in Figure 2A, and then uses different processes to make DRAM storage electrodes with different structures. 28 (Please read the precautions on the back before filling this page). This paper scale is applicable to China National Standard (CNS) Α4 specification (210Χ 297 mm) A7 B7 The Ministry of Economic Affairs Central Rongji Bureau Beigong Consumer Cooperative Printed "X, Invention Description (27) In Figures 10A to 10E, and The similar parts in Figure 2A are marked with the same numbers. Please refer to Figures 10A and 2A, and then, a CVD method is used to deposit a flattened insulating layer 15o, for example, BPSG. Then, the CVD method is used to deposit | I build an etch protection layer 52, which is, for example, a silicon nitride layer. After that, deposit a thick insulating layer, such as a silicon dioxide layer, with a thickness of about 7000 Angstroms. _ \ Back 1 Use traditional light The mask making and etching techniques define the insulating layer, thus forming the insulating pillars 154a and 154b as shown in the figure below. ψ Master-again! The positions of the columnar insulating layers 154a and 154b are approximately in the drain region 1, respectively. And% I I skirt 16b above. ; 1 I Please refer to FIG. 10B, and then sequentially deposit an insulating layer 1 1 156, a polycrystalline silicon layer 158, and an insulating layer 16 by CVD. The insulating layers 156 and 160 1 1 are, for example, silicon dioxide 'insulating layers 156, 160 and the polycrystalline silicon layer 158, and the molarity 1 is set to about 100 angstroms, for example. In order to improve the conductivity of the polycrystalline silicon layer 158, Ke implanted 1 1 arsenic ions into the polycrystalline silicon layer 158. 1 1 | Please refer to FIG. 10C, and then use the traditional mask making technology to form a photo resist layer 1 1 1, and sequentially anisotropically etch the uncovered oxide sand layer 160 and polycrystalline silicon Layer, silicon dioxide layer B6 'columnar insulating layer 1 1 154a; l54b, etching protective layer, 52, planarizing insulating layer, 50, and gate 1 1 1 oxide layer 14 to form the storage electrode contact window 164 &; And 164b 'It is divided into 1 «from the upper surface of the insulating layer 16〇 extends to the surface of the drain region 16a and 161). 1 1 Please refer to FIG. 10D, and then deposit a polycrystalline silicon layer 166 to fill the storage I electrode contact windows l64a and 164b. Reuse the traditional photomask patterning and lithography techniques 1 1 Define the polysilicon layer 166 to form 29 connected to the drain region 6a and 1Gb respectively __________________________________________ ____------------- 1 1 1 1 1 Standard towel _ home fresh (⑽) eight 4 secret (21 () κ297ϋ) 1 306036 printed by the employee consumer cooperative of the Central Standards Bureau of the Ministry of Economic Affairs Fifth, the invention description (28) tree-like trunk polycrystalline silicon layers j66a and 160b. Please refer to FIG. 10E again, and then etch the insulating layer 160 and the polysilicon layer 158 in order using conventional photomask patterning and etching techniques to define the storage electrodes of the storage capacitors of the memory cells. That is, this step cuts the polycrystalline silicon layer 158 into sections 158a and 158b. Next, the wet etching method is used, and the etching protection layer 152 is used as the etching end point to remove the exposed silicon dioxide layer, that is, the insulating layers 160, 156 and 154a are removed; 154b ° This step completes the dynamic random access memory The storage electrode of the bulk storage capacitor, as shown in FIG. 10E, is composed of a trunk-like polycrystalline silicon layer 166a; 166b, and a dendritic polycrystalline silicon layer 158a; . The storage electrode structure of the preferred embodiment shown in FIG. 10E is very similar to that shown in FIG. 8E, but the process difference between the two is very large. In the next preferred embodiment, storage electrodes of different structures are formed by different processes. The storage electrode structure of this preferred embodiment is very similar to the structure of the ninth preferred embodiment described above, the only difference is that its trunk-like polycrystalline silicon layer has a hollow structure to increase the surface area of the storage electrode. Next, with reference to FIGS. 11A and 11B, a tenth preferred embodiment of a semiconductor memory device having a tree-shaped storage capacitor of the present invention will be described in detail. This preferred embodiment of a semiconductor memory device is based on a The tenth preferred embodiment of the semiconductor memory device manufacturing method. This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 10C, and then DRAM storage electrodes with different structures are manufactured by different processes. In Figures 11A and 11B, the parts similar to those in Figure 10 (: the figure is relative to 30 sheets of paper. Applicable towels 1: ¾ (CNS) A4 specification (2 | ()> &lt; 297 Gongchu) -(Please read the precautions on the back before filling in this page) — Installation — — Ordering — First Line — A7 B7 printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs V. The description of the invention (29) is marked with the same number. Please Referring to 11A and 10C, a polycrystalline silicon layer 168 is then deposited by CVD, so that in the storage electrode contact windows 164a and 164b, polycrystalline silicon is formed only on the inner walls of the storage electrode contact windows 164a and 164b, but not the Full storage electrode contact window. Afterwards, using traditional photolithography and etching techniques, the trunk-like polycrystalline silicon layer 168a; 168b of each storage cell storage electrode is defined, as shown in the figure it has a U-shaped cross-section, Increase the surface area of the storage electrode. Please refer to FIG. 11B again, and then use the traditional mask making and etching techniques to feed the insulating layer 160 and the polycrystalline silicon layer 158 in order to define the storage capacitor storage of each memory cell Electrodes. That is, the polycrystalline silicon layer 158 is cut into several steps Sections 158a and 158b. Next, the wet etching method and the etching protection layer 152 are used as the etching end point to remove the exposed silicon dioxide layer, that is, the insulating layers 160, 156 and IMa are removed; 154b. This step is completed The storage electrode of the storage capacitor of the dynamic random access memory, as shown in FIG. 11B, is composed of a trunk-like polycrystalline silicon layer 168a having a U-like cross-section; 168b, and a dendrite-like having a three-section bent cross-section The polycrystalline silicon layer 158a; 158b together. The storage electrode structure of the preferred embodiment shown in FIG. 11B is the only difference from that shown in FIG. 10E, only in the trunk-like polycrystalline silicon layer 168a; 168b and 166a; The structure of 166b is different. In the above-mentioned ninth and tenth preferred embodiments, the shape of the columnar insulating layer can also be changed by other means to change the extended shape of the dendritic polycrystalline silicon layer and Extension angle. For example, photoresist etching technique can be used to form a stepped columnar insulating layer. Or in the case of Figure 10A, (please read the precautions on the back before filling this page) U5 -β
This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297 public meal). The A7 B7 is printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of the invention (30) If isotropic etching (such as wet etching) 'Instead of anisotropic (anisotropic) etch method, this thick insulating layer is etched' to obtain a triangle-like insulating layer; or also in the case of Fig. 10A 'formed in the columnar insulating layers 154a and 154b After that, a side wall insulating layer is formed on the side walls of the columnar insulating layers 154a and 154b, and another type of columnar insulating layer with a different shape can also be obtained. Therefore, the dendritic polycrystalline silicon layer can have a variety of extended shapes with different angles. Similarly, in other preferred embodiments, the shape of the columnar polycrystalline silicon layer can also be changed into various shapes by other means to change the extended shape and extended angle of the dendritic polycrystalline silicon layer. For example, in the case of FIG. 2B, if isotropic etching, such as plasma etching, is used instead of anisotropic etching, the thick polycrystalline silicon layer is etched to obtain a triangle-like Polycrystalline silicon layer. In any of the above-mentioned first to tenth preferred embodiments, the entire tree-shaped storage electrode has a single hierarchical structure as a whole. However, the present invention is not limited thereto, and the tree-shaped storage electrode of the present invention may be a stacked structure of two levels or more levels. The next preferred embodiment will describe a two-level tree storage electrode structure. Next, the eleventh preferred embodiment of a semiconductor memory element having a tree-shaped storage capacitor of the present invention will be described in detail with reference to FIGS. 12A to i2C. This preferred embodiment of a semiconductor memory element is a type of the present invention. The semiconductor memory device is made of frontal quill needles-complex surface. This preferred embodiment Η is based on the structure of the preferred embodiment shown in FIG. 3B 'and then uses different processes to produce a two-level structured dram storage power 32. This paper standard is applicable to China National Standard (CNS) )-(Please read the precautions on the back before filling in this page)-Install _, 1T Line Ministry of Economic Affairs Central Standards Bureau Employee Consumer Cooperative Printed A7 B7 V. Invention description (31). In Figs. 12A to 12C, the parts similar to those in Fig. 3B are marked with the same numbers. Please refer to FIGS. 12A and 3B. After the basic structure of the tree storage electrode at the lower level has been formed, a polycrystalline silicon layer and an insulating layer 171 are sequentially deposited. The insulating layer 171 is, for example, silicon dioxide, and the complex The thickness of the crystalline silicon layer 170 and the silicon dioxide layer 171 are both about 1000 angstroms, for example. Thereafter, using conventional photomask patterning and etching techniques, the insulating layer 171 is etched to define the contact windows 174a and 174b, which extend from the upper surface of the insulating layer 171 to the upper surface of the polycrystalline silicon layer 170, respectively. Next, a thick polycrystalline silicon layer is deposited with a thickness of, for example, about 7000 angstroms. In order to improve the conductivity of the polycrystalline silicon layer, for example, arsenic ions can be implanted into the polycrystalline silicon layer. Then, the conventional photolithography and etching techniques are used to define the polycrystalline silicon layer, thereby forming the columnar polycrystalline silicon layer 172a; 172b as shown in FIG. 12A. The columnar polycrystalline silicon layers 172a; 172b extend from the upper surface of the polycrystalline silicon layer Π0 through contact windows 174a and 174b, respectively, generally upward. With this, the columnar polycrystalline silicon layer and 172b are electrically connected to the storage electrode structure of the lower layer. Please refer to FIG. 12B, and then complete the structure of FIG. 12B with a similar process as described above for FIGS. 3A and 3B. That is, the insulating layer (176, 180, 184) and the polycrystalline silicon layer (178, 182) are alternately deposited by CVD. Then, using CMP technology, the surface of the entire structure is polished at least until the portions above the columnar polycrystalline silicon layers 172a and 172b are exposed. Please refer to FIG. 12C again, and then complete the structure of FIG. 12C with a similar process as described above for FIG. 3C. That is, a polycrystalline silicon layer 188 is deposited with a thickness of, for example, about 1000 angstroms. Then, use the traditional mask making and etching 33 (please read the precautions on the back before filling in this page). The paper size is applicable to the Chinese National Standard (CNS) Λ4 specification (210X297mm) Employees of the Central Standardization Bureau of the Ministry of Economic Affairs Consumer Cooperative Printed Poly A7 B7 V. Description of the invention (32) _ technology, sequentially etching polycrystalline silicon layer 188, insulating layer 184, polycrystalline sand layer 182, insulating layer 180, polycrystalline sand layer 178, insulating layers 176 and 171, complex The crystal sand layer 170, the insulating layer 48 'the polycrystalline silicon layer 46, the insulating layer 44, and the polycrystalline silicon layer 42' define the secondary storage electrode of the storage capacitor of each memory cell. That is, the polycrystalline silicon The layers 188, 82, 178, 170, 46 and 42 are cut into several sections 188a; 188b, 182a. 182b, 178a; 178b, 170a; 170b, 46a; 46b and 42a; 42b. Then by wet etching, And take the etch protector 22 as the end point of the etch, and remove all the exposed-oxidized sand layer, that is, remove the marginal layers 184, 180, 176, 171, 48, 44 and 40. This step completes the dynamic random access The storage electrode of the storage capacitor of the memory is as the first Figure 2C is composed of two tree-shaped storage electrode structure layers similar to that shown in Figure 3C. Obviously, this preferred embodiment can greatly increase the surface area of the storage electrode. In any of the preferred embodiments and the eleventh preferred embodiment, the bottom of the columnar polycrystalline silicon layer is directly connected to the drain region of the transfer transistor. However, the present invention is not limited to this. The columnar polycrystalline silicon layer of the invention can also be indirectly connected to the drain region of the transfer transistor through another conductive layer. The next preferred embodiment will describe that the columnar polycrystalline silicon layer is indirectly connected through another conductive layer To the structure of the drain region of the transfer transistor. Next, referring to FIGS. 13A and 13B, a twelfth preferred embodiment of a semiconductor memory device having a tree-shaped storage capacitor of the present invention will be described in detail. The preferred embodiment is manufactured by the twelfth preferred embodiment of a semiconductor §3 memory device manufacturing method of the present invention. 3 4 China) A4 specification 10 X 297 ^ i &quot; j ~~ --- (please first Read the notes on the back (Fill in this page) • Packing. 306036 A7 B7 Printed by Employee Consumer Cooperative of Central Bureau of Standards and Economics V. Invention Description (33) This preferred embodiment is based on the structure of the preferred embodiment shown in FIG. 2A Then, the T-shaped lower polycrystalline silicon layer and the columnar upper polycrystalline silicon layer are formed by different processes, and the two together form a trunk-like conductive layer of the storage electrode. In Figs. 13A and 13B, the parts similar to those in Fig. 2A are marked with the same numbers. Please refer to FIGS. 13A and 2A. Next, a planarized insulating layer 190 is deposited by CVD, for example, BPSG. Then, an etch protection layer 192, such as a silicon nitride layer, is deposited by CVD. After that, using conventional photomask patterning and etching techniques, the etching protection layer 192 and the planarization insulating layer 190 are sequentially etched to form storage electrode contacts 194a and 194b, which extend from the upper surface of the etching protection layer 192 to The surfaces of the drain regions 16a and 16b. Next, a layer of polycrystalline silicon is deposited. In order to increase the conductivity of the polycrystalline silicon layer, for example, arsenic ions can be implanted into the polycrystalline silicon layer. Then use traditional photomask patterning and etching techniques to define the polycrystalline silicon layer to form polycrystalline silicon layers 196a and 196b with a T-shaped cross section as shown in Figure 13A, which is used as a DRAM storage electrode under the trunk-like shape The conductive layer extends from the surfaces of the drain regions 16a and 16b through the storage electrode contact windows 194a and 194b, respectively, upward and outward. According to the present invention, the polycrystalline silicon layer may not be defined first, and will be defined together when the storage electrode of the storage capacitor of each memory cell is to be defined later. Please refer to FIG. 13B. Next, an insulating layer 198 is deposited, which is, for example, silicon dioxide. Then, "windows" 200a and 200b are formed using traditional photomask patterning and etching techniques, exposing a portion of the upper surface of the polycrystalline silicon layers 196a and 196b. After that, deposit a thick layer of polycrystalline silicon with a thickness of 35 (please read the notes on the back before filling this page)
iK. installed-,-° line paper scale is applicable to China National Standard Falcon (CNS) Λ4 specifications (210x 297 mm), the Ministry of Economic Affairs, Central Bureau of Standards, Employee Consumer Cooperative, A7 B7 — --_ ------- ----- V. Description of the invention (34) For example, about 7000 angstroms. In order to increase the conductivity of the polycrystalline silicon layer ', for example, arsenic ions can be implanted into the polycrystalline silicon layer. Then, the conventional photolithography and etching techniques are used to define the polycrystalline silicon layer, thereby forming the columnar polycrystalline silicon layer 202a; 202b as shown in FIG. 13B. The columnar polycrystalline silicon layers 202a; 202b extend from the upper surfaces of the polycrystalline silicon layers 196a and 196b through the windows 200a and 200b, respectively, and serve as a trunk-like upper conductive layer for the DRAM storage electrode. Then, the process conception of any one of the first to eighth preferred embodiments and the eleventh preferred embodiment can be used to complete different tree capacitor structures. Those skilled in the art should understand that the above-mentioned conceptual features of the preferred embodiments of the present invention can be used in addition to individual applications, and can also be used in combination to achieve storage electrodes and storage capacitors of many different structures. The structures of these storage electrodes and storage capacitors should fall within the protection scope of the present invention. It should be noted that although the drains of the transfer transistors in the drawings are all diffused region structures on the surface of the silicon substrate, the invention is not limited thereto, and any suitable drain structure can be applied to the invention, such as trench ) Jiji is an example. Furthermore, it should also be noted that the shape, size, and extension angle of each component part in the drawings are only schematic representations for convenience of illustration, and may be different from the actual situation, so it should not be used to limit the present invention. Although the present invention has been disclosed above in a number of preferred embodiments, it is not intended to limit the present invention. “Anyone who is familiar with this skill, without departing from the spirit and scope of the present invention, can make some changes and retouching, so this The scope of protection of an invention shall be deemed as defined by the scope of the attached patent application. 3 6 This paper is suitable for Chinese national standard (CNS> Λ4 $ grid (2 丨 OX297 public broadcasting) —- (please read the precautions on the back and then fill out this page). Binding
A8 B8 C8 D8 printed by the Employees ’Cooperative of the Central Bureau of Standards of the Ministry of Economy VI. Patent application 1. A semiconductor memory device with a capacitor includes: a substrate; a transfer transistor formed on the substrate and including the drain and Source area! And a storage capacitor electrically coupled to one of the drain and source regions of the transfer transistor, the storage capacitor includes: a type of trunk-like conductive layer having a bottom, electrically coupled to the transfer transistor On one of the drain and source regions, the trunk-like conductive layer has an upward extension, extending from the bottom in a generally upward direction, and a branch-like upper conductive layer is electrically coupled to Above this type of trunk-like conductive layer, at least one type of dendritic lower conductive layer has an L-shaped cross-section, and this type of dendritic lower conductive layer is connected to the lower surface of this type of dendritic upper conductive layer. The trunk-like conductive layer, the dendritic-like upper conductive layer, and the dendritic-like lower conductive layer constitute a storage electrode of the storage capacitor, and a dielectric layer formed on the trunk-like conductive layer, the dendritic-like upper conductive The exposed surface of the layer, and the dendritic lower conductive layer, and an upper conductive layer are formed on the dielectric layer to constitute an opposite electrode of the storage capacitor. 2. The semiconductor memory device as described in item 1 of the scope of the patent application, wherein the storage capacitor includes two substantially parallel dendritic lower conductive layers, each of which has an L-shaped cross-section and is connected to the Dendritic-like upper conductive layer on the lower surface. 37 This paper scale is applicable to China National Standard (CNS) Α4 specification (210X297mm) (please read the notes on the back before filling in this page). Packing-Stranding A8 B8 C8 D8 Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 6. Patent application scope 3. The semiconductor memory device as described in item 1 of the patent application scope, wherein the storage capacitor further includes a second type dendritic conductive layer having a terminal connected to the trunk conductive layer of this type The outer surface and an outwardly extending portion extend outward from the end in a substantially horizontal direction. 4. The semiconductor memory device as described in item 3 of the patent application range, wherein the second type of dendritic conductive layer is located below the dendritic lower conductive layer. 5. The semiconductor memory device as described in item 1 of the scope of the patent application, wherein the dendritic lower conductive layer has a double L-shaped cross section. 6. The semiconductor memory device as described in item 1 of the patent application scope wherein the dendritic upper conductive layer includes a central portion electrically coupled to the upper surface of the trunk-shaped conductive layer; and an outward extension The part extends outward from the central part. 7. The semiconductor memory device as described in item 6 of the patent application scope, wherein the dendritic lower conductive layer includes a first extension portion connected to the lower surface of the dendritic upper conductive layer, and is approximately Extends downward; and a second extension extends substantially outward from the first extension. 8. The semiconductor memory device as described in item 1 of the scope of the patent application, wherein the dendritic lower conductive layer includes an inner surface connected to the outer surface of the trunk conductive layer. 9. The semiconductor memory device as described in item 1 of the patent application, wherein the trunk-like conductive layer further includes an outwardly extending portion extending outward from the upwardly extending portion in a substantially horizontal direction. 10. —Semiconductor memory elements with capacitors include: 38 (please read the notes on the back ^ item before filling out this page) Binding ·-Order · The size of the line paper is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm ) A8 Βδ C8 D8 is printed by the employee consumer cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. 6. Patent application-a substrate; a transfer transistor formed on the substrate and including the drain and source regions; and a storage capacitor, electrical Coupled to one of the drain and source regions of the transfer transistor, the storage capacitor includes: a type of trunk-like conductive layer having a bottom, electrically coupled to the drain and source regions of the transfer transistor On one, the trunk-like conductive layer has an upward extension, extending from the bottom in a generally upward direction, and a branch-like upper conductive layer is electrically coupled above the trunk-like conductive layer * At least one kind of dendritic lower conductive layer, including at least a first extension and a second extension, one end of the first extension is connected to the dendritic upper conductive layer On the lower surface, the second extending section extends from the other end of the first extending section at an angle, and the trunk-like conductive layer, the dendritic upper conductive layer, and the dendritic lower conductive layer constitute A storage electrode of the storage capacitor, a dielectric layer, formed on the exposed surface of the trunk-like conductive layer, the dendritic upper conductive layer, and the dendritic lower conductive layer, and an upper conductive layer, Is formed on the dielectric layer to constitute an opposite electrode of the storage capacitor. Π. The semiconductor memory element and device as described in item 10 of the patent application scope, wherein the storage capacitor includes two substantially parallel dendritic lower conductive layers, each of which is connected to the dendritic upper conductive layer On the lower surface, 39 paper standards are applicable to the Chinese National Standard (CNS) A4 (2 丨 0X297mm) binding line (please read the precautions on the back before filling this page) 3 6 3 ο ABCD Ministry of Economics Central Standards Bureau staff Printed by the consumer cooperative. Scope of patent application 〇12. The semiconductor memory device as described in item 10 of the patent application scope, wherein the storage capacitor further includes a second type of dendritic conductive layer with an end connected to the The outer surface of the trunk-like conductive layer and an outward extending portion extend outward from the end. 13. The semiconductor memory element as described in item 12 of the patent application scope, wherein the second type of dendritic conductive layer is located below the type of dendritic lower conductive layer and extends substantially horizontally. 14. The semiconductor memory device as described in item 10 of the patent application scope, wherein the dendritic lower conductive layer has a double L-shaped cross section. 15. The semiconductor memory device as described in item 10 of the patent application scope, wherein the dendritic upper conductive layer includes a central portion electrically coupled to the upper surface of the trunk-shaped conductive layer; and an outward extension The part extends outward from the central part. 16. The semiconductor memory device according to item 15 of the patent application scope, wherein the first extension of the dendritic lower conductive layer extends substantially downward from the dendritic upper conductive layer, and the second extension The segment extends generally outward from the first extension. Π. The semiconductor memory device as described in item 16 of the patent application range, wherein the dendritic lower conductive layer further includes a third extension extending substantially downward from the second extension; and a fourth extension The segment extends generally outward from the third extension. 18. The semiconductor memory device as described in item 10 of the patent scope, in which the dendritic lower conductive layer includes an inner surface connected to the type 40 deaf-(please read the precautions on the back before filling this page )
The size of this paper is printed by China National Standards (CNS) A4 (210X297 mm). The A8 B8 C8 D8 is printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 6. Scope of Patent Application The outer surface of the trunk-like conductive layer. 19. The semiconductor memory device as described in item 10 of the patent application, wherein the trunk-like conductive layer further includes an outwardly extending portion extending outward from the upwardly extending portion in a substantially horizontal direction. 20. A semiconductor memory device having a capacitor includes: a substrate; a transfer transistor formed on the substrate and including drain and source regions; and a storage capacitor electrically coupled to the transfer transistor On one of the drain and source regions, the storage capacitor includes a trunk-like conductive layer with a bottom, electrically coupled to one of the drain and source regions of the transfer transistor, the trunk-like The conductive layer further has a cylindrical extension extending from the bottom in a generally upward direction, a type of dendritic upper conductive layer electrically coupled above the type of trunk-shaped conductive layer, at least a type of dendritic lower The conductive layer has an end connected to the lower surface of the dendritic upper conductive layer, and the dendritic lower conductive layer has an outwardly extending portion that extends outward from the end. The trunk-shaped conductive layer, The dendritic upper conductive layer and the dendritic lower conductive layer constitute a storage electrode of the storage capacitor, and a dielectric layer formed on the trunk-like conductive layer and the dendritic upper conductive On the exposed surface of the electric layer and the dendritic lower conductive layer, and an upper conductive layer is formed on the dielectric layer to form the storage capacitor 4 1 (please read the precautions on the back before filling in this Page)-The size of the paper used for the binding is printed using the Chinese National Standard (CNS) A4 (210 X 297 mm). The A8 B8 C8 D8 is printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 6. A counter electrode for patent application . 21. The semiconductor memory device as described in item 20 of the scope of the patent application, wherein the outwardly extending portion of the dendritic lower conductive layer has a section with a multi-node bending shape. 22. The semiconductor memory device as described in item 20 of the patent application range, wherein the storage capacitor includes a plurality of substantially dendritic lower conductive layers extending substantially in parallel, and one end of each dendritic lower conductive layer is connected to the On the lower surface of the dendritic upper conductive layer. 23. A semiconductor memory device with a capacitor includes: a substrate; a transfer transistor formed on the substrate and including drain and source regions; and a storage capacitor electrically coupled to the transfer transistor On one of the drain and source regions, the storage capacitor includes: a type of trunk-like conductive layer having a bottom electrically coupled to one of the drain and source regions of the transfer transistor, the type of trunk The conductive layer has an upward extending portion extending from the bottom in a generally upward direction. At least one type of dendritic conductive layer includes at least a first extending section, a second extending section, and a third extending section , The first extension is connected to the outer surface of the trunk-like conductive layer, the second extension extends from the first extension at a first angle, and the third extension extends at a second angle , Extending from the second extension section, the trunk-like conductive layer and the dendritic-like conductive layer constitute a storage electrode of the storage capacitor, 42 paper standards are applicable to the Chinese National Standard (CNS) A4 specification (210X 297mm) (Please read the precautions on the back before filling in this page)-Packing. A8 B8 C8 D8 printed by the Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs VI. Scope of Patent Application ~ Dielectric layer, formed in this A trunk-like conductive layer and a dendritic-like conductive layer are exposed on the surface, and an upper conductive layer is formed on the dielectric layer to form a counter electrode of the storage capacitor #. 24. The semiconductor memory element as described in item 23 of the scope of the patent application: "wherein the upward extension of the trunk-like conductive layer of this type includes a hollow portion. 25. One piece of semiconductor memory element as described in item 24 of the scope of patent application wherein the trunk-like conductive layer has a U-shaped cross-section. 26. The semiconductor memory device as described in item 23 of the patent application scope, wherein the trunk-like conductive layer includes a trunk portion electrically coupled to one of the drain and source regions of the transfer transistor; and An upper trunk portion extends from the upper surface of the lower trunk portion and has a T-shaped cross section. 27. The semiconductor memory element i described in Item 26 of the patent application scope, wherein the dendritic conductive layer is connected to the outer surface of the upper trunk portion. 28. The semiconductor memory device as described in item 23 of the patent application scope, wherein the trunk-like conductive layer includes a trunk portion electrically coupled to one of the drain and source regions of the transfer transistor; And an upper trunk portion extends from the upper surface of the lower trunk portion and has a hollow tubular section. 29. The semiconductor memory element as described in item 28 of the scope of the patent application wherein the dendritic conductive layer is connected to the outer surface of the upper trunk portion. 43 This paper is fully applicable to the Chinese National Standard (CNS) 8.4 specifications (2 × 297 mm) ------------ installed ------ β ------ line '( Please read the precautions on the back and fill in this page first.) 306036 A8 B8 C8 D8 6. Patent application scope 30. The semiconductor memory element as described in item 23 of the patent application scope {牛 'Where such a trunk-like conductive layer has A T-shaped section. 31. The semiconductor memory device as recited in item 23 of the patent application scope, wherein the first extension extends substantially from the outer surface of the trunk-like conductive layer, and the second extension extends approximately from the first The segment extends downwards. The third extending segment extends substantially outward from the second extending segment. (Please read the precautions on the back and then fill out this page)-Packing. Binding Line Printed by the Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 44 This paper size is applicable to the Chinese National Standard (CNS) A4 specification (2 丨 ox297mm)
TW85110005A 1996-08-16 1996-08-16 Semiconductor memory device with capacitor (part 2) TW306036B (en)
TW85110005A TW306036B (en) 1996-08-16 1996-08-16 Semiconductor memory device with capacitor (part 2)
US08/706,732 US5952689A (en) 1996-08-16 1996-09-06 Semiconductor memory device having tree-type capacitor
JP9007949A JP2977077B2 (en) 1996-08-16 1997-01-20 Semiconductor memory device with tree-type capacitor
GB9701922A GB2321770A (en) 1996-08-16 1997-01-30 Stacked capacitor
FR9705113A FR2752489B1 (en) 1996-08-16 1997-04-25 Semiconductor memory device having a shaft type capacitor
DE1997120210 DE19720210A1 (en) 1996-08-16 1997-05-14 Semiconductor memory device with capacitor
TW306036B true TW306036B (en) 1997-05-21
ID=21625393
US (1) US5952689A (en)
TW (1) TW306036B (en)
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1996-08-16 TW TW85110005A patent/TW306036B/en active
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