Source: https://patents.google.com/patent/CN102815659A/en
Timestamp: 2020-08-03 11:21:08+00:00
Document Index: 15737406

Matched Legal Cases: ['arts 121', 'arts 121', 'arts 121', 'arts 124', 'arts 121', 'arts 121', 'arts 121', 'arts 121', 'arts 121', 'art 118', 'art 119', 'art 126', 'art 126', 'art 118', 'art 119', 'art 118', 'art 119', 'arts 121', 'arts 124', 'arts 121', 'arts 124', 'arts 121', 'arts 121', 'arts 121', 'art 127', 'art 127', 'art 127', 'arts 121', 'arts 136', 'arts 136', 'arts 121', 'arts 121', 'art 127', 'art 207']

CN102815659A - Semiconductor Devices With Moving Members and Methods for Making the Same - Google Patents
Semiconductor Devices With Moving Members and Methods for Making the Same Download PDF
CN102815659A
CN102815659A CN201210010820XA CN201210010820A CN102815659A CN 102815659 A CN102815659 A CN 102815659A CN 201210010820X A CN201210010820X A CN 201210010820XA CN 201210010820 A CN201210010820 A CN 201210010820A CN 102815659 A CN102815659 A CN 102815659A
conductive plug
CN201210010820XA
CN102815659B (en
张贵松
林宗贤
台湾积体电路制造股份有限公司
2011-06-10 Priority to US13/157,994 priority Critical patent/US9586811B2/en
2011-06-10 Priority to US13/157,994 priority
2012-01-11 Application filed by 台湾积体电路制造股份有限公司 filed Critical 台湾积体电路制造股份有限公司
2012-12-12 Publication of CN102815659A publication Critical patent/CN102815659A/en
2015-05-13 Application granted granted Critical
2015-05-13 Publication of CN102815659B publication Critical patent/CN102815659B/en
239000004065 semiconductor Substances 0.000 title claims abstract description 17
239000000758 substrates Substances 0.000 claims abstract description 222
239000010410 layers Substances 0.000 claims description 178
229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 91
229920005591 polysilicon Polymers 0.000 claims description 91
238000005530 etching Methods 0.000 claims description 72
229910052710 silicon Inorganic materials 0.000 claims description 72
239000002184 metal Substances 0.000 claims description 70
229910052751 metals Inorganic materials 0.000 claims description 70
XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound 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[Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 66
238000005516 engineering processes Methods 0.000 claims description 62
239000003989 dielectric material Substances 0.000 claims description 26
239000004020 conductor Substances 0.000 claims description 14
PIGFYZPCRLYGLF-UHFFFAOYSA-N aluminum nitride Chemical compound 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[Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 claims description 13
230000000694 effects Effects 0.000 claims description 8
238000000151 deposition Methods 0.000 claims description 7
239000011521 glass Substances 0.000 claims description 7
229910010271 silicon carbide Inorganic materials 0.000 claims description 7
230000000295 complement Effects 0.000 claims description 6
229910044991 metal oxides Inorganic materials 0.000 claims description 6
150000004706 metal oxides Chemical class 0.000 claims description 6
WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound 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[W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 6
239000010937 tungsten Substances 0.000 claims description 6
230000015572 biosynthetic process Effects 0.000 claims description 5
238000005755 formation Methods 0.000 claims description 5
229910003726 AI2O3 Inorganic materials 0.000 claims description 3
PNEYBMLMFCGWSK-UHFFFAOYSA-N al2o3 Chemical compound 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[O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
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239000010936 titanium Substances 0.000 description 5
239000010949 copper Substances 0.000 description 4
RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0nMS4wJyBlbmNvZGluZz0naXNvLTg4NTktMSc/Pgo8c3ZnIHZlcnNpb249JzEuMScgYmFzZVByb2ZpbGU9J2Z1bGwnCiAgICAgICAgICAgICAgeG1sbnM9J2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnJwogICAgICAgICAgICAgICAgICAgICAgeG1sbnM6cmRraXQ9J2h0dHA6Ly93d3cucmRraXQub3JnL3htbCcKICAgICAgICAgICAgICAgICAgICAgIHhtbG5zOnhsaW5rPSdodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rJwogICAgICAgICAgICAgICAgICB4bWw6c3BhY2U9J3ByZXNlcnZlJwp3aWR0aD0nODVweCcgaGVpZ2h0PSc4NXB4JyB2aWV3Qm94PScwIDAgODUgODUnPgo8IS0tIEVORCBPRiBIRUFERVIgLS0+CjxyZWN0IHN0eWxlPSdvcGFjaXR5OjEuMDtmaWxsOiNGRkZGRkY7c3Ryb2tlOm5vbmUnIHdpZHRoPSc4NScgaGVpZ2h0PSc4NScgeD0nMCcgeT0nMCc+IDwvcmVjdD4KPHRleHQgZG9taW5hbnQtYmFzZWxpbmU9ImNlbnRyYWwiIHRleHQtYW5jaG9yPSJzdGFydCIgeD0nMTYuMjI1NCcgeT0nNDcuNzk1NScgc3R5bGU9J2ZvbnQtc2l6ZTozOHB4O2ZvbnQtc3R5bGU6bm9ybWFsO2ZvbnQtd2VpZ2h0Om5vcm1hbDtmaWxsLW9wYWNpdHk6MTtzdHJva2U6bm9uZTtmb250LWZhbWlseTpzYW5zLXNlcmlmO2ZpbGw6IzNCNDE0MycgPjx0c3Bhbj5DdTwvdHNwYW4+PC90ZXh0Pgo8L3N2Zz4K [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
229910052802 copper Inorganic materials 0.000 description 3
239000010931 gold Substances 0.000 description 3
238000001259 photo etching Methods 0.000 description 3
238000005498 polishing Methods 0.000 description 3
PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
NRTOMJZYCJJWKI-UHFFFAOYSA-N titanium nitride Chemical compound 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[Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
238000005229 chemical vapour deposition Methods 0.000 description 1
238000001312 dry etching Methods 0.000 description 1
238000009832 plasma treatment Methods 0.000 description 1
238000001039 wet etching Methods 0.000 description 1
QCWXUUIWCKQGHC-UHFFFAOYSA-N zirconium Chemical compound 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[Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
229910052726 zirconium Inorganic materials 0.000 description 1
B81B3/001—Structures having a reduced contact area, e.g. with bumps or with a textured surface
B81C1/00563—Avoid or control over-etching
B81C1/00579—Avoid charge built-up
B81B2207/012—Microstructural systems or auxiliary parts thereof comprising a micromechanical device connected to control or processing electronics, i.e. Smart-MEMS the micromechanical device and the control or processing electronics being separate parts in the same package
B81B2207/07—Interconnects
B81B2207/092—Buried interconnects in the substrate or in the lid
B81B2207/094—Feed-through, via
B81B2207/095—Feed-through, via through the lid
B81B2207/096—Feed-through, via through the substrate
B81C2201/014—Controlling etch progression by depositing an etch stop layer, e.g. silicon nitride, silicon oxide, metal
The present disclosure provides an embodiment of a micro-electro-mechanical system (MEMS) structure, the MEMS structure comprising a MEMS substrate; a first and second conductive plugs of a semiconductor material disposed on the MEMS substrate, wherein the first conductive plug is configured for electrical interconnection and the second conductive plug is configured as an anti-stiction bump; a MEMS device configured on the MEMS substrate and electrically coupled with the first conductive plug; and a cap substrate bonded to the MEMS substrate such that the MEMS device is enclosed therebetween.
Semiconductor devices and manufacturing approach thereof with movable part
In general, the present invention relates to the semiconductor manufacturing.Particularly, the present invention relates to have the device and the manufacturing approach thereof of movable part.
Microelectromechanical systems (MEMS) device comprises the minimum electronic mechanical system that is integrated in the semiconducter IC circuit.Some MEMS devices have the movable part through cavity and one or more projection and substrate separation.Projection can be positioned on the top of substrate or be positioned on the top of movable part.The purpose of projection is in order to limit the range of movement of movable part, to prevent movable part contact substrate or be located immediately at the layer on the substrate top.When some materials were used for projection such as oxide, the oxide projection possibly cause dielectric charging problem.In addition, the device with oxide projection that obtains possibly experience parasitic capacitance and stiction (stiction).Parasitic capacitance and stiction possibly make the device that obtains inoperative in some motion of induction.
Some routine techniques that are used to form cavity are included in substrate top deposit sacrificial oxides layer.Then sacrificial oxide layer is carried out patterning, and adopt gaseous hydrogen fluoride (HF) it to be etched away to form cavity as etchant.Other routine techniques can use plasma dry-etching or chemical wet etching.Then Silicon Wafer is fused on overetched sacrificial oxide layer.Adopt the Silicon Wafer of welding to create movable part.Yet these routine techniques possibly not be best in some cases.For example, if after the etching oxide layer depositing silicon wafer, then the welding between Silicon Wafer and the oxide skin(coating) maybe be insecure, this does not expect.
For another example, a kind of common process forms sacrifice layer without planarization.The inhomogeneities of sacrificial oxide layer has been set up the stairstepping in the cross section of the silicon layer that on the top of sacrifice layer, forms then.These stairsteppings generally provide relatively poor mechanical boundaries, and can cause low-yield.
In another example, form also planarization sacrificial oxide layer.Yet, when during the HF etching, forming cavity, be difficult to the size of control cavity.What therefore, need is improved MEMS device and manufacturing approach thereof.
In order to solve existing problem in the prior art, according to an aspect of the present invention, a kind of microelectromechanical systems (MEMS) structure is provided, said MEMS structure comprises: the MEMS substrate; First conductive plug of semi-conducting material and second conductive plug are set on the said MEMS substrate, and wherein said first conductive plug is configured to be used for electrical interconnection, and said second conductive plug is configured to anti-stiction projection; The MEMS device is configured on the said MEMS substrate, and is electrically connected with said first conductive plug; And the caping substrate, be engaged to said MEMS substrate, make said MEMS device be closed between said caping substrate and the said MEMS substrate.
In this MEMS structure, the said semi-conducting material of said first conductive plug and said second conductive plug is selected from by polysilicon, SiGe and the group that constitutes thereof.
In this MEMS structure, further comprise: the 3rd conductive plug of said semi-conducting material is set on the said MEMS substrate, and is electrically connected with said first conductive plug; First dielectric materials layer is set on the said MEMS substrate, and is embedded with said the 3rd conductive plug; Etching stopping layer is set on said first dielectric materials layer, and comprises aluminium nitride (AlN), carborundum (SiC), low stress nitride silicon (SiN) and aluminium oxide (Al 2O 3) at least a; And second dielectric materials layer, be set on the said etching stopping layer, and be embedded with said first conductive plug.
In this MEMS structure, wherein said MEMS substrate comprises a kind of in silicon substrate, glass substrate and GaAs (GaAs) substrate.
In this MEMS structure, wherein said caping substrate comprises a kind of in complementary metal oxide semiconductors (CMOS) (CMOS) substrate, MEMS substrate and the combination thereof.
In this MEMS structure, further comprise interconnection structure, said interconnection structure is set on the said caping substrate, and wherein said interconnection structure comprises tungsten plug and metal wire.
In this MEMS structure, further comprise: the conductor wire of said semi-conducting material, said conductor wire are set on the said MEMS substrate, and are connected to said first conductive plug.
In this MEMS structure, further comprise: attachment, be formed on the said MEMS substrate, and be configured to surrounded by said first conductive plug, wherein said attachment have from the surface of said first conductive plug depression; And said caping substrate is bonded together through said attachment and said caping substrate.
In this MEMS structure, wherein said MEMS substrate further comprises through hole and is set at the metal parts in the said through hole; And said metal parts extends through said MEMS substrate, is electrically connected to the solder projection parts that on the surface away from the said MEMS substrate of said first conductive plug, are provided with, and further is electrically connected to said MEMS device through said first conductive plug.
In another aspect of this invention, a kind of microelectromechanical systems (MEMS) structure is provided, said MEMS structure comprises: first substrate; First polysilicon plug is set on said first substrate, and wherein said first polysilicon plug is configured to be used for electrical interconnection; The MEMS device is configured to be positioned on said first substrate, and is electrically connected with said first polysilicon plug; And second substrate, be engaged to said first substrate, make said MEMS device be closed.
In this MEMS structure, further comprise: second polysilicon plug is set on said first substrate, and is electrically connected with said first polysilicon plug; First dielectric materials layer is set on said first substrate, and is embedded with said second polysilicon plug; Etching stopping layer is set on said first dielectric materials layer; Second dielectric materials layer is set on the said etching stopping layer, and is embedded with said first polysilicon plug; And the 3rd conductive plug, embed in said second dielectric materials layer, contiguous said MEMS device, and be configured to anti-stiction projection.
In this MEMS structure, said etching stopping layer comprises aluminium nitride.
In this MEMS structure, said first polysilicon plug and said etching stopping layer further play and during etch process, stop etching to make the effect of said MEMS device.
In this MEMS structure, said first substrate comprises a kind of in silicon substrate, glass substrate and GaAs (GaAs) substrate; And second substrate comprise a kind of in complementary metal oxide semiconductors (CMOS) (CMOS) substrate, MEMS substrate and the combination thereof.
In this MEMS structure, said first substrate and said second substrate are bonded together through attachment, and said attachment are configured to centered on by said first polysilicon plug; And said first polysilicon plug further plays the effect of protection ring, preventing the extruding problem during the joint technology, thereby engages said first substrate and said second substrate.
In this MEMS structure, said first substrate further comprises through hole and the metal parts that in said through hole, is provided with; And said metal parts extends through said first substrate, is electrically connected to the solder projection parts that on the surface of said first substrate away from said first polysilicon plug, are provided with, and further is electrically connected to said MEMS device through said first polysilicon plug.
In this MEMS structure, further comprise: a kind of in wire bond pads and the solder projection is set on said second substrate, and is connected to said MEMS device through said first polysilicon plug.
According to another aspect of the invention, a kind of method of the MEMS of being used to form structure is provided, said method comprises: on the MEMS substrate, form interconnection structure, said interconnection structure has first conductive plug of conductor wire and semi-conducting material; On said interconnection structure, form etching stopping layer; Above said etching stopping layer, form dielectric layer; Above said dielectric layer, engage silicon substrate; In said silicon substrate, form second conductive plug and the 3rd conductive plug of said semi-conducting material, wherein, said second conductive plug is configured to be electrically connected with said first conductive plug, and said the 3rd conductive plug is configured to anti-stiction projection; Form the MEMS device that is electrically connected with said second conductive component; And form the bond pad be positioned on the said silicon substrate and centered on by said second conductive plug.
In the method, said semi-conducting material comprises a kind of in polysilicon and the SiGe; And said silicon substrate comprises the High Resistivity Si material.
In the method, further comprise: the caping substrate is engaged to said MEMS substrate through said bond pad.
In the method, forming said second conductive plug further comprises: deposited material layer on said silicon substrate; Said material layer of etching and said silicon substrate are to form through hole therein; In the said through hole of said material layer and said silicon substrate, form said second conductive plug of said semi-conducting material; And remove said material layer, make said second conductive plug from said silicon substrate, highlight.
In the method, forming bond pad comprises and forms the bond pad that is positioned on the said silicon substrate and is centered on by the ledge of said second conductive plug.
In the method, further comprise: the caping substrate is engaged to said MEMS substrate through said bond pad; The said MEMS substrate of etching is to form through hole therein; And in said through hole and said MEMS substrate depositing metal layers, form the solder projection be electrically connected with said second conductive plug.
When combining accompanying drawing to read, can understand various aspects of the present invention better according to following detailed description.Should be emphasized that according to the standard practices in the industry, various parts are not drawn in proportion.In fact, in order clearly to discuss, the size of various parts can at random be increased or dwindled.
Figure 1A to Fig. 1 C shows the illustrative methods according to the manufacturing MEMS device encapsulation of an embodiment.
Fig. 2 A and Fig. 2 B show the another kind of illustrative methods of making the encapsulation of MEMS device according to an embodiment.In Figure 1A to Fig. 1 C, Fig. 2 A and Fig. 2 B, use a series of cross sections of MEMS device during manufacturing step that corresponding method is shown.
Different parts for embodiment of the present invention the following disclosure provides many various embodiment or instance.The particular instance that is described below element and layout is to simplify the present invention.Certainly these only are that instance does not plan to limit.In addition, the present invention maybe be in each embodiment repeat reference numerals and/or letter.This repetition just for the sake of simplicity and purpose clearly, and itself do not specify each embodiment and/or the structure discussed between relation.Moreover, ground floor the second layer " on " the perhaps description of " top " (with similar description) comprises the embodiment that wherein ground floor and the second layer directly contact, and one or more layers inserts the embodiment between the ground floor and the second layer.The present invention relates to the MEMS device; Yet, but those of ordinary skills will find to benefit from other application technologies of the present invention, such as nanoelectronic mechanical system (NEMS) device.And MEMS device architecture that illustrates or design only are exemplary, do not plan to be used for by any way restriction.
The technology of Figure 1A to Fig. 1 C, Fig. 2 A and Fig. 2 B is wafer scale technology, and wherein for the ease of explanation, one of unit of wafer is shown in the cross section.Be appreciated that other unit application same process to structure encapsulate to set up similar MEMS device.
Figure 1A to Fig. 1 C shows the illustrative methods 100 that is used to make semiconductor MEMS device.Every technology in the method 100 all uses the cross section of semiconductor devices during the given step of making to represent, and this method is described as series of process.The MEMS device that employing method 100 is made can be used for any various uses based on MEMS, such as accelerometer and other motion detection sensors.Semiconductor structure shown in technology 105 to the technology 160 is called as the MEMS wafer in this article.In step subsequently, adopt caping wafer (caps wafer) to encapsulate (Fig. 1 C).
Method 100 starts from technology 105, and technology 105 shows silicon substrate 101.Dielectric layer 102 on substrate 101, and dielectric layer 102 is carried out patterning.An exemplary embodiment comprises SiO 2Chemical vapor deposition (CVD), but also can use other depositing operations.And consideration can be used the dielectric layer of other types.Can on substrate 101, form oxide skin(coating) (such as layer 102) at the additive method that forms dielectric layer on the substrate through joint, deposition, thermal oxide, CVD are perhaps as known in the art.Can adopt photoetching process and etched pattern dielectric layer 102 (perhaps oxide skin(coating) 102), in oxide skin(coating) 102, limit a plurality of openings, thereby in opening, substrate 101 is come out.
Then, for example adopt CVD deposits also patterned polysilicon layer 103 on dielectric layer 102.Patterning can comprise for example photoetching and etching.Polysilicon layer 103 is doped to has suitable electric conductivity, and as signal wiring layer (signal routing layer), is further explained as following.Polysilicon layer 103 forms on the substrate 101 of the opening that is positioned at oxide skin(coating) 102, and further on oxide skin(coating) 102, forms.The polysilicon layer 103 of process patterning constitutes the part of interconnection structures, and this interconnection structure comprises one or more polysilicon plugs of the opening that is arranged in oxide skin(coating) 102 and is positioned at the polysilicon lines on the oxide skin(coating) 102.
Substrate 101 is shown as silicon, but the scope of embodiment is not limited to silicon.For example, other embodiment can use different backing materials, such as glass, GaAs, High Resistivity Si, low-resistance silicon or the like.Similarly, polysilicon layer 103 can substitute such as SiGe, WSi, Au or Ti with other conductive material layers that can stand high temperature in other embodiments.Dielectric layer 102 can comprise oxide, SiN or the like.
In technology 110, form oxide skin(coating) 102 with covering polysilicon layer 103, and deposition etch stops layer 104 on oxide skin(coating) 102.In certain embodiments, before forming etching stopping layer 104, on layer 102, implement flatening process (for example, chemically mechanical polishing).Etching stopping layer 104 comprises that tolerance is used for material or other corresponding dielectric materials (if being used for dielectric layer 102 alternatively) of the etchant of etching oxide layer 102.A kind of exemplary etchant that is used for etching oxide layer 102 comprises hydrofluoric acid (HF).A kind of exemplary etch stop material is the dielectric material that tolerance is used for the etchant (for example HF) of etching oxide layer 102, such as aluminium nitride (AlN), but in various embodiment, can use other materials, such as AlN, SiC, low stress SiN and Al 2O 3In an example, through sputtering at depositing Al N on the oxide skin(coating) 102.
In technology 115, etch layer 102 and layer 104 form with limited hole, then deposition and patterned polysilicon layer 106.Not shown photoresist in Figure 1A, but should understand through adopting etch process to realize to remove other parts of layer 102, layer 104, layer 106, and photoresist can be used for setting up the pattern of layer 102, layer 104, layer 106.Shown in technology 115, polysilicon layer 106 is implemented patternings, with comprise in the through hole polysilicon plug be positioned at the polysilicon lines on the etching stopping layer 104, and be electrically connected to polysilicon layer 103, thereby set up two signal wiring layers.Though show two polysilicon interconnection layers, if necessary, interconnection structure can comprise more a plurality of polysilicon layers.
In technology 120, adopt for example chemically mechanical polishing (CMP) to form and planarization dielectric layer 107.In the present embodiment, dielectric layer 107 comprises silica, and this silica can obviously be etched away to set up cavity and movable part is come out in technology 160.Further, that dielectric layer 107 (or oxide skin(coating) 107) is partially-etched in technology 120, be used to form release groove 109 (being explained further below) and anti-stiction projection district 108 (also being explained further below).In technology 125, oxide skin(coating) 107 is further implemented patterning to limit the through hole area by through hole area 111 representatives.
In technology 130, Silicon Wafer 112 is fused to oxide skin(coating) 107.In one embodiment, realize welding through commercial connector.Fusion splicer is implemented plasma treatment to wafer, aims at this two wafers then, and applies active force to engage this two wafers.During fusion joining process or after, can implement annealing process, to increase bond strength.In the present embodiment, between the silica of the silicon of Silicon Wafer and oxide skin(coating) 107, realize welding.Alternatively, suitably other substrates of material can be used for engaging with dielectric layer 107.In some instances, where applicable is then with Silicon Wafer 112 attenuates.On Silicon Wafer 112, form another dielectric layer 113, such as silica.Dielectric layer 113 comprises suitable thickness, and this thickness limits the height of anti-stiction projection (being explained further below).It should be noted that in technology 130, before oxide skin(coating) 107 is etched away, Silicon Wafer 112 is fused to oxide skin(coating) 107, to form the cavity (as shown in the technology 160) of MEMS device.This specific character has increased the quality of the welding between layer 112 and the layer 107.By contrast, the low and low problem of productive rate of welding quality possibly appear in the embodiment of welding Silicon Wafer above preformed cavity.
In technology 135, layer 112 and layer 113 etching are passed through with further limited hole district (for example through hole area 111) and projection district 108.In operation subsequently with polysilicon filling vias district 111 and projection district 108 (difference), with the multilayer of electrical connection interconnection structure and form anti-stiction projection.
In technology 140, implement polysilicon deposition with filling vias district 111 and projection district 108.Through polysilicon deposition filling vias district 111 to form polysilicon plug 117.Plug 117 is designed to electrical wiring, and also is called as through hole 117.Fill projection district 108 through polysilicon deposition, to form polysilicon plug 114 and polysilicon plug 116.The anti-stiction projection that plug 114 and plug 116 are used as shown in technology 160, and also be called as anti-stiction projection 114 and anti-stiction projection 116.In an example, adopt low-pressure chemical vapor deposition (LPCVD) deposit spathic silicon.In addition, in technology 140,, etching or polishing are implemented in the surface of polysilicon, get back to the surface of layer 113 such as through CMP technology.Embodiment is not limited in polysilicon, uses other suitable materials because can substitute.In each embodiment, can adopt polysilicon, SiGe and/or other suitable materials, such as the conductive material of the etchant (for example gas HF) that tolerates etching dielectric layer (for example dielectric layer 107), filling vias 117, projection 114 and projection 116.Can conformal deposited also be preferred with the material that forms through hole 117, projection 114 and projection 116.In certain embodiments, also can use metal plating to form through hole 117, projection 114 and projection 116.Other candidate things that are used for through hole 117, projection 114 and projection 116 comprise for example tungsten (W), titanium nitride (TiN), copper (Cu), gold (Au), titanium (Ti) and nickel (Ni).
In technology 145, oxide skin(coating) 113 is removed, come out in the top of polysilicon through hole and projection.Through the thickness restricting poly-silicon through hole of dielectric layer 113 and the top of projection.Projection 114 plays anti-stiction effect with projection 116 during operation MEMS device.And through hole 117 plays electrical wiring effect.According to each embodiment of the present invention,, eliminated Issues on Static Electrification because those anti-stiction parts have electric conductivity.In addition, polysilicon plug (such as 117) also is used for during etch process subsequently, stopping etching, to form the MEMS device.Particularly, etching stopping layer 104 stops etching on vertical direction (direction vertical with substrate 101), and polysilicon plug 117 stops etching on level (perhaps horizontal) direction.
In technology 150, deposition and patterned metal layer are to form metal parts 121 to 124.The material of metal parts 121 to 124 has electric conductivity, and can engage with caping wafer (perhaps caping substrate (cap substrate)) the enforcement wafer of Fig. 1 C, engages such as eutectic.For example, metal parts 121 to metal parts 124 can be formed by tungsten, aluminium, copper, nickel, other proper metal or other suitable conductive materials (such as the germanium that mixes).Can implement other joining techniques alternatively, such as diffusion bond or welding.Can adopt deposition (for example PVD), patterning (such as photoetching and etching) and/or any other method now known or exploitation from now on to form metal parts 121 to 124.
In order to engage and electrically wiring, metal parts 121 to 124 is implemented patterning.In addition, metal parts 121 to 124 is implemented patternings, be used for further preventing extruding (squish) problem during the joint technology.Adopt metal parts 121 as an example, metal parts 121 comprises inside 126 and the edge part 118 and edge part 119 that surround inner 126.Configuration inner 126 is used for eutectic and engages.Particularly, in further step, can caping wafer (Fig. 1 C) be placed MEMS wafer top, wherein the caping wafer comprises the metal that selection engages with metal section and part 126 eutectics.Eutectic engages caping wafer and MEMS wafer is bonded together.Eutectic engages and relates to deposite metal part 126, so melted portion 126 during providing metal section and part 118 and metal section and part 119 with the restriction joint technology.The caping wafer can comprise that also metal section and part corresponding to metal section and part 118 and metal section and part 119 is with restriction eutectic metal.
In addition, molten metal during the restriction joint technology (for example eutectic joint) is also played at the top that surrounds the polysilicon plug 111 of metal parts 121 to metal parts 124, thereby prevents that molten metal from overflowing.
Metal parts 121 to metal parts 124 illustrates with cross section in Figure 1B.In vertical view, in certain embodiments, metal parts 121 to 124 can form two concentric rings.In addition, metal parts 121 to 124 serves as and the electric contact piece of layer 103 with the polysilicon interconnection of layer in 106.In the MEMS device of accomplishing, layer 103 carries the signal of telecommunication with the polysilicon of layer 106 in the MEMS device, and this signal of telecommunication is accessible through the contact that is formed by metal parts 121 to 124.
Technology 155 shows the step of accomplishing the MEMS wafer with technology 160.In technology 155, etch silicon layer 112 is to form the MSMS structure.Note, in technology 155, adopt etching to form movable part 127 and 128.In addition, also will discharge groove 109 comes out.
In technology 160, steam HF is used to remove the part of oxide skin(coating) 107.Particularly, steam HF contacts with oxide skin(coating) 107 through discharging groove 109, thus the silicon layer below the etching 112, so that movable part 127 and 128 is come out.
During etch process, the etching stopping layer that layer 104 serves as on the y direction of principal axis (vertical direction), thereby the degree of depth of the cavity between restriction silicon layer 112 and the substrate 101.And the polysilicon through hole 117 that in technology 140, forms serves as etch stop on x direction of principal axis (horizontal direction), thus the width of restriction cavity.In one aspect, the polysilicon through hole has double action, as carrying signal structure and as etch stop arrangement.Further in this embodiment, movable part 127 and 128 comprises the anti-stiction projection 131 of polysilicon and 132.Opposite with the oxide projection of conventional MEMS device, anti-stiction projection 131 and 132 has electric conductivity, does not experience significant accumulation.
Method 100 proceeds to Fig. 1 C.In the technology 165 of Fig. 1 C, MEMS wafer 133 eutectics are engaged in caping wafer 134.In one embodiment, caping wafer 134 is semiconductor crystal wafers, such as Silicon Wafer, forms various integrated circuits (such as the MEMS drive circuit) above that.In one embodiment, caping wafer 134 comprises various CMOS transistors, and may further include other active and passive devices.Caping wafer 134 may further include interconnection structure, such as metal wire, Metal Contact part and metal throuth hole.In one embodiment, the interconnection structure of caping wafer 134 comprises tungsten plug and copper (or aluminium) metal wire.Caping wafer 134 is not limited to the CMOS wafer.In certain embodiments, caping wafer 134 can be CMOS wafer, another MEMS wafer, intermediary layer wafer or be used for covering the pure structure wafer of (capping) or encapsulation.Caping wafer 134 also comprises metallic traces, and this metallic traces is configured to and is used for metal parts 121 to 124 alignings that wafer engages.In the present embodiment, caping wafer 134 comprises metal parts 136 to 139.
Can MEMS wafer 133 be placed caping wafer 134 tops; Thereby the metal parts 136 to 139 that makes caping wafer 134 is aimed at and the metal parts 121 to 124 of contact MEMS wafer 133; And the formation eutectic engages (in technology 165, possibly comprise heating steps, be used to promote eutectic to engage).Unit shown in this view being the combination of MEMS wafer 133 and caping wafer 134 is the MEMS device package.In certain embodiments, the MEMS device package is crystal wafer chip dimension packaging part (WLCSP), although other embodiment possibly use different encapsulation technologies.In step subsequently, can implement to cut to form the MEMS device package of wafer scale.
The cross section of technology 170a and technology 170b shows the different modes that forms signal contacting piece in the outside of encapsulation.In technology 170a; The substrate through vias (perhaps passing through silicon through hole or TSV) 171 and 172 that forms in the caping wafer 134 through adopting etching and metal to be deposited on provides the electrical with the MEMS device with the polysilicon plug through connected structure between interconnection structure, MEMS wafer and the caping wafer of caping wafer 134 and MEMS wafer 133.On the back side of caping wafer 134, form metal pad 173 and 174, and further this metal pad 173 and 174 is connected to TSV 171 and 172, be used to provide and the communicating by letter of package outside.In an example, metal pad 173 and 174 is solder projections.
In the optional embodiment shown in the technology 170b, on MEMS wafer 133, form similar TSV and metal pad.Particularly, be deposited in the MEMS wafer 133 through etching and metal and form TSV 175 and 176, the telecommunication with the MEMS device is provided with each polysilicon plug through MEMS wafer 133.On the back side of MEMS wafer 133, form metal pad 177 and 178, and further this metal pad 177 and 178 is connected in TSV 175 and 176, to provide and the communicating by letter of package outside.In an example, metal pad 177 and 178 is solder projections.
In another embodiment; Before engaging MEMS wafer 133 and caping wafer 134; On both surfaces of MEMS wafer 133 and caping wafer 134, form anti-stiction coating,, be used to prevent the stiction during the MEMS device operation such as the self-assembled monolayer coating.
The TSV 171 to 172 of Fig. 1 C (perhaps 175 to 176) and metal pad 173 and 174 (perhaps 177 and 178) provide with the external electric of the inner signal of MEMS device encapsulation and communicate by letter.Therefore, utilize corresponding TSV and metal pad can import or export the signal that on the interconnection layer that forms by polysilicon layer 103 and 106, is loaded with.TSV forms the unique a kind of mode that electrically contacts with packaging part.
In other embodiments, can use the bonding wire pad.For example, the bond pad of utilizing grinding technics will be used to connect the outside of encapsulation of the embodiment shown in Fig. 2 A to Fig. 2 B comes out.Be appreciated that and comprise that the deposition used among Figure 1A to Fig. 1 C and the technology of etched similar type can be applied in the technology of Fig. 2 A to Fig. 2 B.And the structure of formation similar type such as polysilicon structure, is used for electrical wiring, anti-stiction and splice protection, and is further used for preventing Issues on Static Electrification on the MEMS wafer.
Fig. 2 A to Fig. 2 B shows the illustrative methods 200 that is used to make the MEMS device according to an embodiment.Fig. 2 A starts from technology 205, and it is implemented after the technology 150 of Figure 1B.
In technology 205, dielectric layer 206 such as oxide skin(coating), is carried out patterning then, to cover the expose portion of metal parts 121 to 124 and polysilicon plug.During the etching operation of technology 215, use dielectric layer 206 as mask.In technology 210, implement etching with silicon layer 101 and 112, dielectric layer 102 and 107 and etching stopping layer 104 part that is positioned at the edge of MEMS wafer Unit 133 remove.
In technology 215, use dielectric layer 206 as the hard mask that carries out patterning, etching silicon wafer 112.Similar with the technology 155 of Figure 1B, etching formation movable part 127 and 128 also will discharge groove 109 and come out.In technology 220, implement steam HF etching to remove the part of layer 107.Etching stopping layer 104 serves as with polysilicon through hole (for example through hole 117) and is used for etched y-axle and x-axle border.Again, it should be noted that after Silicon Wafer 112 and layer 107 welding and form cavity.
Fig. 2 B shows the example package step after the technology 220 of Fig. 2 A.The technology 225 of Fig. 2 B is similar with the technology 165 of Fig. 1 C, and in technology 165, eutectic engages wafer 133 and 134.In technology 230, implement the edge part 207 and 208 of wafer masks with the unit that removes MEMS wafer 133.In technology 235, implement etching from the metal pad 211 and 212 of caping wafer 134 then so that oxide coating 209 is removed.Though not shown in this article, can use the bonding wire of pad 211 and 212 and the signal routing structure telecommunication of polysilicon layer 103 and 106.In another example, on pad 211 and 212, forming the solder projection (not shown) is used for being electrically connected.
The MEMS device encapsulation of Fig. 2 B also comprises the getter structure (getter structure) 213 that is positioned on the caping wafer 134.When adopting vacuum cavity, can use getter structure 213 to increase the interior vacuum of cavity of MEMS device in certain embodiments.Getter structure 213 comprises the material that can effectively absorb the inner exhaust particulate of vacuum cavity.In an example, getter structure 213 comprises titanium (Ti), bromine (Br) or zirconium (Zr).Getter structure 213 illustrates and is positioned on the caping wafer 134, but in other embodiments, the getter structure can be additionally or is included in alternatively on the MEMS wafer 133.Like this equally for other embodiment, comprise the embodiment of Fig. 1 C.
Method 100 is exemplary with method 200, and is understood that other embodiment can comprise interpolation, omission, adjust the technology of perhaps revising certain operations.For example, some embodiment have than more Duoing or still less movable part shown in Fig. 1 C and Fig. 2 B.And Figure 1A to Figure 1B and Fig. 2 B demonstration are set up the illustrative processes of structure with two kinds of signal wiring layers, and should be understood that if necessary, can make amendment to set up three or more a plurality of wiring layer to the technology that this paper showed.In addition, in each embodiment, can comprise other encapsulation step, such as cutting.In the present embodiment, side by side at each MEMS device of wafer-level packaging, thereby reduce manufacturing cost, and strengthen reliability.Then the encapsulation wafer is implemented cutting technique, form a plurality of MEMS devices.
Each embodiment can comprise the advantage that is superior to other technologies.For example, explain, use polysilicon to make the amount that anti-stiction projection reduces the electric charge of assembling at device inside as top.In addition, can use polysilicon signal routing structure, thereby limit the cavity that contains movable part better as etch stop arrangement.And the technology of welding Silicon Wafer is benefited can increasing from the reliability of welding on the top at oxide skin(coating) before forming cavity.
Each embodiment shown in above in any various devices, can using.For example, the MEMS device with movable part especially can be used for motion sensor, such as accelerometer, gyroscope etc.Can in industry and consumer purposes, encapsulate and install the semiconductor devices that comprises the MEMS device.The instance of the purposes that possibly from MEMS device as herein described, be benefited comprises for example play dynamic controller, automobile sensor etc.In other embodiments, can be as individual chips or be arranged on the identical chips as the purposes of another kind of semiconductor devices (such as processor) and use the MEMS device.
Therefore, the invention provides a kind of microelectromechanical systems (MEMS) structure.This MEMS structure comprises the MEMS substrate; First conductive plug of the semi-conducting material that on this MEMS substrate, is provided with and second conductive plug wherein dispose first conductive plug and are used for electrical interconnection, and dispose second conductive plug as anti-stiction projection; MEMS device that on this MEMS substrate, dispose and that be electrically connected with first conductive plug; And the caping substrate that engages with this MEMS substrate, make the MEMS device be closed between MEMS substrate and the caping substrate.
In one embodiment, the semi-conducting material of first conductive plug and second conductive plug is selected from by in polysilicon, SiGe and the group formed thereof.In another embodiment, the MEMS structure further comprises the 3rd conductive plug of semi-conducting material, and the 3rd conductive plug of this semi-conducting material is set on the MEMS substrate and with first conductive plug and is electrically connected; First dielectric materials layer, this first dielectric materials layer are set on first substrate and are embedded with the 3rd conductive plug; Etching stopping layer, this etching stopping layer is set on first dielectric materials layer, and comprises aluminium nitride (AlN), carborundum (SiC), low stress nitride silicon (SiN) and aluminium oxide (Al 2O 3) at least a; And second dielectric materials layer, this second dielectric materials layer is set on the etching stopping layer, and is embedded with first conductive plug.
In yet another embodiment, the MEMS substrate comprises a kind of in silicon substrate, glass substrate and GaAs (GaAs) substrate.In yet another embodiment, the caping substrate comprises a kind of in complementary metal oxide semiconductors (CMOS) (CMOS) substrate, MEMS substrate and the combination thereof.In yet another embodiment, the MEMS structure further comprises the interconnection structure that is arranged on the caping substrate, and wherein this interconnection structure comprises tungsten plug and metal wire.In yet another embodiment, the MEMS structure further comprises the conductor wire of semi-conducting material, and the conductor wire of this semi-conducting material is set on the MEMS substrate, and is connected in first conductive plug.In yet another embodiment, the MEMS structure further comprises attachment, and these attachment form on the MEMS substrate, and is configured to by the sealing of first conductive plug, and wherein these attachment have the surface that falls in from first conductive plug; And the caping substrate is bonded together through attachment and caping substrate.In yet another embodiment, the MEMS substrate further comprises through hole and the metal parts that in this through hole, is provided with; And this metal parts extended penetrate the MEMS substrate, be electrically connected on the solder projection parts that on the surface away from first conductive plug of MEMS substrate, are provided with, and further be electrically connected on the MEMS device through first conductive plug.
The present invention also provides another embodiment of microelectromechanical systems (MEMS) structure.This MEMS structure comprises first substrate; First polysilicon plug that on first substrate, is provided with wherein disposes first polysilicon plug and is used for electrical interconnection; The MEMS device, this MEMS device is configured on first substrate and with first polysilicon plug and is electrically connected; And second substrate, this second substrate is engaged in first substrate, thereby the MEMS device is closed.
In one embodiment, the MEMS structure further comprises second polysilicon plug, and this second polysilicon plug is set on first substrate, and is electrically connected with first polysilicon plug; First dielectric materials layer, this first dielectric materials layer is set on first substrate, and is embedded with second polysilicon plug; Etching stopping layer, this etching stopping layer are set on first dielectric materials layer; Second dielectric materials layer, this second dielectric materials layer is set on the etching stopping layer, and is embedded with first polysilicon plug; And the 3rd conductive plug, the 3rd conductive plug is embedded in second conductive material layer, near the MEMS device, and is configured to anti-stiction projection.In another embodiment, etching stopping layer comprises aluminium nitride.In yet another embodiment, first polysilicon plug and etching stopping layer further play and during etch process, stop etching to make the effect of MEMS device.In yet another embodiment, first substrate comprises a kind of in silicon substrate, glass substrate and GaAs (GaAs) substrate; And second substrate comprise a kind of in complementary metal oxide semiconductors (CMOS) (CMOS) substrate, MEMS substrate and the combination thereof.In yet another embodiment, first substrate and second substrate are bonded together through attachment, and these attachment are configured to sealed by first polysilicon plug; And first polysilicon plug further play the effect of protection ring, preventing the extruding problem during the joint technology, thereby engage first substrate and second substrate.In yet another embodiment, first substrate further comprises through hole and the metal parts that in this through hole, is provided with; And this metal parts extended through first substrate, be electrically connected to the solder projection parts that on the surface away from first polysilicon plug of first substrate, are provided with, and further be electrically connected to the MEMS device through first polysilicon plug.In yet another embodiment, the MEMS structure further comprises a kind of in wire bond pads and the solder projection, and this wire bond pads and solder projection are set on second substrate, and are connected in the MEMS device through first polysilicon plug.
The present invention also provides the embodiment of the method that is used to form the MEMS structure.This method is included on the MEMS substrate and forms interconnection structure, and this interconnection structure has first conductive plug of conductor wire and semi-conducting material; On this interconnection structure, form etching stopping layer; Above this etching stopping layer, form dielectric layer; Above this dielectric layer, engage silicon substrate; In this silicon substrate, form second conductive plug and the 3rd conductive plug of semi-conducting material, wherein dispose this second conductive plug and be used to be electrically connected first conductive plug, and dispose the 3rd conductive plug and be used to serve as anti-stiction projection; Form the MEMS device that is electrically connected with second conductive component; And form and to be positioned on the silicon substrate and by the bond pad of second conductive plug sealing.
In an embodiment of method, semi-conducting material comprises a kind of in polysilicon and the SiGe; And silicon substrate comprises the High Resistivity Si material.In another embodiment, this method further comprises the caping substrate is engaged in the MEMS substrate through bond pad.In yet another embodiment, form second conductive plug and further be included in deposited material layer on the silicon substrate; Etched material layer and silicon substrate are to form through hole therein; In the through hole of material layer and silicon substrate, form second conductive plug of semi-conducting material; And remove material layer, thereby make second conductive plug outstanding from silicon substrate.
In yet another embodiment, forming bond pad comprises and forms the bond pad that is positioned on the silicon substrate and is centered on by the ledge of second conductive plug.In yet another embodiment, form the MEMS device and comprise that etched silicon substrate is to come out dielectric layer; Etching dielectric layer; Adopt the etching stopping layer and second conductive plug on vertical and horizontal, to stop etching.In yet another embodiment, dielectric layer comprises silica; Etching stopping layer comprises aluminium nitride; And etching dielectric layer uses the hydrofluoric acid etch agent.In yet another embodiment, this method further comprises the caping substrate is engaged in the MEMS substrate through bond pad; Etching MEMS substrate is to form through hole therein; And in through hole and MEMS substrate depositing metal layers, form the solder projection be electrically connected with second conductive plug.In yet another embodiment, this method further comprises cutting MEMS substrate and caping substrate, forms a plurality of MEMS devices.
The present invention also provides another embodiment of the method that is used to form the MEMS structure.This method is included on the MEMS substrate and forms interconnection structure, and this interconnection structure has first conductive plug of conductor wire and semi-conducting material; On this interconnection structure, form etching stopping layer; Above this etching stopping layer, form dielectric layer; Above this dielectric layer, engage silicon substrate; Etched silicon substrate comes out dielectric layer to form through hole therein; Form second conductive plug of semi-conducting material, this second conductive plug is electrically connected with first conductive plug, and is configured to further as anti-stiction projection; Etched silicon substrate is to form the MEMS device that is electrically connected with second conductive component; Formation is positioned on the silicon substrate and by the bond pad of second conductive plug sealing; The caping substrate is engaged to the MEMS substrate through bond pad; Etching MEMS substrate is to form through hole therein; And in through hole and MEMS substrate depositing metal layers, form the solder projection be electrically connected with second conductive projection.
Discuss the parts of some embodiment above, made those of ordinary skills can understand specific descriptions thereafter better.It should be appreciated by those skilled in the art that and to use the present invention to design or change other technologies and structure as the basis at an easy rate, thereby reach the identical purpose of the embodiment that introduced with this paper and/or realize identical advantage.Those skilled in the art should be appreciated that also this equivalent constructions does not deviate from the spirit and scope of the present invention, and under the situation that does not deviate from the spirit and scope of the present invention, can carry out multiple variation, replacement and change.
1. a microelectromechanical systems (MEMS) structure, said MEMS structure comprises:
The MEMS substrate;
First conductive plug of semi-conducting material and second conductive plug are set on the said MEMS substrate, and wherein said first conductive plug is configured to be used for electrical interconnection, and said second conductive plug is configured to anti-stiction projection;
The MEMS device is configured on the said MEMS substrate, and is electrically connected with said first conductive plug; And
The caping substrate is engaged to said MEMS substrate, makes said MEMS device be closed between said caping substrate and the said MEMS substrate.
2. MEMS structure according to claim 1, wherein, the said semi-conducting material of said first conductive plug and said second conductive plug is selected from by polysilicon, SiGe and the group that constitutes thereof, perhaps
Further comprise:
The 3rd conductive plug of said semi-conducting material is set on the said MEMS substrate, and is electrically connected with said first conductive plug;
First dielectric materials layer is set on the said MEMS substrate, and is embedded with said the 3rd conductive plug;
Etching stopping layer is set on said first dielectric materials layer, and comprises aluminium nitride (AlN), carborundum (SiC), low stress nitride silicon (SiN) and aluminium oxide (Al 2O 3) at least a; And
Second dielectric materials layer is set on the said etching stopping layer, and is embedded with said first conductive plug, perhaps
Wherein said MEMS substrate comprises a kind of in silicon substrate, glass substrate and GaAs (GaAs) substrate, perhaps
Wherein said caping substrate comprises a kind of in complementary metal oxide semiconductors (CMOS) (CMOS) substrate, MEMS substrate and the combination thereof, perhaps
Further comprise interconnection structure, said interconnection structure is set on the said caping substrate, and wherein said interconnection structure comprises tungsten plug and metal wire, perhaps
Wherein, The said semi-conducting material of said first conductive plug and said second conductive plug is selected from by polysilicon, SiGe and the group that constitutes thereof; And further comprise: the conductor wire of said semi-conducting material; Said conductor wire is set on the said MEMS substrate, and is connected to said first conductive plug, perhaps
Further comprise: attachment are formed on the said MEMS substrate, and are configured to surrounded by said first conductive plug, wherein
Said attachment have from the surface of said first conductive plug depression; And
Said caping substrate is bonded together through said attachment and said caping substrate, perhaps
Said MEMS substrate further comprises through hole and is set at the metal parts in the said through hole; And
Said metal parts extends through said MEMS substrate, is electrically connected to the solder projection parts that on the surface away from the said MEMS substrate of said first conductive plug, are provided with, and further is electrically connected to said MEMS device through said first conductive plug.
3. a microelectromechanical systems (MEMS) structure, said MEMS structure comprises:
First substrate;
First polysilicon plug is set on said first substrate, and wherein said first polysilicon plug is configured to be used for electrical interconnection;
The MEMS device is configured to be positioned on said first substrate, and is electrically connected with said first polysilicon plug; And
Second substrate is engaged to said first substrate, makes said MEMS device be closed.
4. MEMS structure according to claim 3 further comprises:
Second polysilicon plug is set on said first substrate, and is electrically connected with said first polysilicon plug;
First dielectric materials layer is set on said first substrate, and is embedded with said second polysilicon plug;
Etching stopping layer is set on said first dielectric materials layer;
Second dielectric materials layer is set on the said etching stopping layer, and is embedded with said first polysilicon plug; And
The 3rd conductive plug embeds in said second dielectric materials layer, contiguous said MEMS device, and be configured to anti-stiction projection.
5. MEMS structure according to claim 4, wherein, said etching stopping layer comprises aluminium nitride, perhaps
Wherein, said first polysilicon plug and said etching stopping layer further play and during etch process, stop etching to make the effect of said MEMS device.
6. MEMS structure according to claim 3, wherein
Said first substrate comprises a kind of in silicon substrate, glass substrate and GaAs (GaAs) substrate; And
Second substrate comprises a kind of in complementary metal oxide semiconductors (CMOS) (CMOS) substrate, MEMS substrate and the combination thereof, perhaps
Said first substrate and said second substrate are bonded together through attachment, and said attachment are configured to centered on by said first polysilicon plug; And
Said first polysilicon plug further plays the effect of protection ring, preventing the extruding problem during the joint technology, thereby engages said first substrate and said second substrate, perhaps
Said first substrate further comprises through hole and the metal parts that in said through hole, is provided with; And
Said metal parts extends through said first substrate, is electrically connected to the solder projection parts that on the surface of said first substrate away from said first polysilicon plug, are provided with, and further is electrically connected to said MEMS device through said first polysilicon plug, perhaps
Further comprise: a kind of in wire bond pads and the solder projection is set on said second substrate, and is connected to said MEMS device through said first polysilicon plug.
7. method that is used to form the MEMS structure, said method comprises:
On the MEMS substrate, form interconnection structure, said interconnection structure has first conductive plug of conductor wire and semi-conducting material;
On said interconnection structure, form etching stopping layer;
Above said etching stopping layer, form dielectric layer;
Above said dielectric layer, engage silicon substrate;
In said silicon substrate, form second conductive plug and the 3rd conductive plug of said semi-conducting material, wherein, said second conductive plug is configured to be electrically connected with said first conductive plug, and said the 3rd conductive plug is configured to anti-stiction projection;
Form the MEMS device that is electrically connected with said second conductive component; And
The bond pad that formation is positioned on the said silicon substrate and is centered on by said second conductive plug.
8. method according to claim 7, wherein
Said semi-conducting material comprises a kind of in polysilicon and the SiGe; And
Said silicon substrate comprises the High Resistivity Si material.
9. method according to claim 7 further comprises: the caping substrate is engaged to said MEMS substrate through said bond pad, and
Wherein forming said second conductive plug further comprises:
Deposited material layer on said silicon substrate;
Said material layer of etching and said silicon substrate are to form through hole therein;
In the said through hole of said material layer and said silicon substrate, form said second conductive plug of said semi-conducting material; And
Remove said material layer, make said second conductive plug from said silicon substrate, highlight, and
Wherein, forming bond pad comprises and forms the bond pad that is positioned on the said silicon substrate and is centered on by the ledge of said second conductive plug.
10. method according to claim 7 further comprises:
The caping substrate is engaged to said MEMS substrate through said bond pad;
The said MEMS substrate of etching is to form through hole therein; And
Depositing metal layers in said through hole and said MEMS substrate forms the solder projection that is electrically connected with said second conductive plug.
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