Source: https://patents.google.com/patent/CN101355059B/en
Timestamp: 2020-08-13 20:28:48+00:00
Document Index: 46364543

Matched Legal Cases: ['art 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104', 'arts 104']

CN101355059B - Semiconductor device - Google Patents
CN101355059B
CN101355059B CN 200810144562 CN200810144562A CN101355059B CN 101355059 B CN101355059 B CN 101355059B CN 200810144562 CN200810144562 CN 200810144562 CN 200810144562 A CN200810144562 A CN 200810144562A CN 101355059 B CN101355059 B CN 101355059B
CN 200810144562
CN101355059A (en
中柴康隆
2004-11-16 Priority to JP2004332349 priority Critical
2004-11-16 Priority to JP2004-332349 priority
2004-11-16 Priority to JP2004332349A priority patent/JP4689244B2/en
2005-11-16 Application filed by 瑞萨电子株式会社 filed Critical 瑞萨电子株式会社
2009-01-28 Publication of CN101355059A publication Critical patent/CN101355059A/en
2013-10-16 Publication of CN101355059B publication Critical patent/CN101355059B/en
239000004065 semiconductors Substances 0.000 title claims abstract description 106
238000009792 diffusion process Methods 0.000 claims description 91
XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound 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[Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 91
229910052710 silicon Inorganic materials 0.000 abstract description 91
239000010408 films Substances 0.000 description 134
238000005520 cutting process Methods 0.000 description 17
239000004020 conductors Substances 0.000 description 15
239000002184 metals Substances 0.000 description 9
-1 polysiloxanes Polymers 0.000 description 2
The present invention relates to a semiconductor chip 100 which includes a logic unit and an analog unit 153 . Furthermore, the semiconductor chip 100 includes a silicon substrate 101 ; a first insulating film 123 to a sixth insulating film 143 formed on the silicon substrate 101 ; and an annular seal ring 105 consisting of a first conductive ring 125 to a sixth conductive ring 145 buried in the first insulating film 123 to the sixth insulating film 143 , which surrounds the periphery of the logic unit and the analog unit 153 . In the seal ring region 106 , there is formed a pn junction acting as a nonconducting part 104 , which blocks conduction in a path from the logic unit, through the seal ring 105 to the analog unit 153.
The application is that the application number that the applicant submitted on November 16th, 2005 is 200510125334.2, is entitled as dividing an application of " semiconductor device " patent application.
The application is incorporated herein by reference its content at this based on Japanese patent application No.2004-332349.
The present invention relates to comprise the semiconductor device of a plurality of device regions.
In order to protect the circuit formation district in the semiconductor device not affected by moisture or ion in the outside atmosphere, in the inside of line of cut, namely, near the edge of chip (tube core), the protection structure that is known as " sealing ring " is set.Sealing ring is by the interconnection layer (Cu) that forms the district as circuit and contact formations, and forms the circuit formation of encirclement in the semiconductor device and distinguish.
Sealing ring can prevent that also in the process that cutting area is cut circuit from forming cracked in the district.In cutting process, may be chipping in cutting area.But the sealing ring that cutting area and circuit form between the district prevents that this cracked arrival circuit from forming the district.
And, for the surface of protecting semiconductor device and the impact of avoiding outside atmosphere, in the surface of semiconductor device, form the diaphragm that is known as passivating film.
The open No.2004-79596 of the unsettled publication of Japan has described a kind of existing semiconductor device that comprises sealing ring; Particularly, a kind of semiconductor device that comprises sealing ring and the passivating film on it.
After research, the inventor finds: when forming sealing ring in the equipment that is comprising logical circuit formation district (logical block) and analog circuit formation district (analogue unit), the device in the analogue unit may break down.Use have structure shown in Figure 11 and 12 equipment research possible reason.Figure 11 shows the plane graph of the structure of the semiconductor device that comprises sealing ring.Figure 12 is the amplification sectional view (I-I ' sectional view) that has the zone of the sealing ring that forms therein among Figure 11.
As shown in FIG. 11 and 12, in semiconductor chip 200, the inside of the line of cut 203 in silicon substrate 201 forms sealing ring district 206, and in Figure 12, has respectively circuit to form district (internal circuit region 207) and cutting area in left side and right side.Sealing ring district 206 is than internal circuit region 207 more close cutting areas.
As shown in figure 12, semiconductor chip 200 following structures, wherein sequentially deposit insulating intermediate layer 223, insulating intermediate layer 227, insulating intermediate layer 231, insulating intermediate layer 235, insulating intermediate layer 239, insulating intermediate layer 243 and passivating film 247 on silicon substrate 201.Silicon substrate 201 comprises near its surface, n trap 211 and p trap 209 adjacent one another are.P trap 209 is formed on internally circuit region 207 to the zone in sealing ring district 206.
In internal circuit region 207, sequentially deposit gate oxidation films 217 and gate electrode 219 on the surface of the silicon substrate 201 that comprises n trap 211.The p that n trap 211 on silicon substrate 201 forms as source/drain region +Diffusion layer 213 and n +Diffusion layer 215.Also sequentially deposit gate oxidation films 217 and gate electrode 219 on p trap 209.The n that p trap 209 on silicon substrate 201 forms as source/drain region +Diffusion layer 215 and p +Diffusion layer 213.p +Diffusion layer 213, n +Diffusion layer 215 is connected with gate electrode to be connected to and is connected embolism 224.p +Diffusion layer 213 and n +The peripheral side of diffusion layer 215 is insulated by device isolation film 221.Connecting embolism 224 is the conductive plugs that are buried in the insulating intermediate layer 223 and run through insulating intermediate layer 223.Its upper surface is connected to the interconnection 226 of burying in the insulating intermediate layer 227.
In sealing ring district 206, near the surface formation p of silicon substrate 201 +Diffusion layer 213, p +The upper surface of the p trap 209 in diffusion layer 213 and the silicon substrate 201 contacts.p +The surface of diffusion layer 213 is connected to the lower surface of conducting ring 225, and conducting ring 225 is buried in the insulating intermediate layer 223 and runs through insulating intermediate layer 223.From conducting ring 225 towards the direction on upper strata, connect successively conducting ring 229, conducting ring 233, conducting ring 237, conducting ring 241 and conducting ring 245.Conducting ring 229, conducting ring 233, conducting ring 237, conducting ring 241 and conducting ring 245 are buried in respectively in insulating intermediate layer 227, insulating intermediate layer 231, insulating intermediate layer 235, insulating intermediate layer 239 and the insulating intermediate layer 243, and run through these dielectric films.Sealing ring 205 is made of conducting ring 225 to 245.In Figure 12, be formed with three sealing rings 205.
After the work of having studied semiconductor chip 200, inventor's discovery, as shown in figure 13, the noise that produces in digital units 251 is sent to analogue unit 253 by sealing ring 205.Figure 13 shows the plane graph in the path of noise transmission.According to the inventor's research, find in these figure, to be sent to the noise of analogue unit 253 by sealing ring 205, cause the fault of the device in the analogue unit 253.
The present invention is based on that the aforesaid inventor's new discovery realizes, and relates to by forming at guard ring and form non-conductive parts in the district and stop noise transmission.
According to an aspect of the present invention, provide a kind of semiconductor device with first and second device regions, comprising:
The insulating intermediate layer that forms in Semiconductor substrate, and
Consist of and surround the ring protection ring of the periphery of the first device region by the conducting film of in insulating intermediate layer, burying,
Wherein form at guard ring and form non-conductive parts in the district, non-conductive parts stop from the first device region by the conduction of guard ring to the path of the second device region.
Term " guard ring " refers to surround the annular conductive component of the periphery of at least one device region as used herein.This guard ring can be the parts that arrange along the edge in the Semiconductor substrate (line of cut), such as sealing ring.But, form guard ring along line of cut optional.For example, guard ring can be enclosed in the parts of the first device region of intracardiac formation in the Semiconductor substrate, and the second device region can be formed on the position than the more close line of cut of guard ring.The flat shape of guard ring is not limited to the ring of complete closure, but can comprise partly ring jaggy and a part of ring that is insulated the intermediate layer isolation.
Term " guard ring form district " refers to comprise the annular region of guard ring in plane graph as used herein, and though guard ring fully be annular whether.Except guard ring, this zone also comprises for example Semiconductor substrate and the insulating intermediate layer that forms on the Semiconductor substrate.
Term " non-conductive parts " refers to that guard ring forms the parts in the district as used herein, and it makes the first district and Second Region non-conductive by stopping from the first device region by the conduction of guard ring to the path of the second device region.The specific embodiment of non-conductive parts comprises that (i) is formed on the insulation layer and the pn junction plane that (ii) is formed in this path in this path.
Impedance Z in the specific region is represented by formula (1) usually:
Z＝R+j(ωL-1/ωC)????????????????(1)
Wherein ω is frequency, and R is resistance, and L is that self-induction and C are electric capacity.
Non-conductive parts among the present invention have the suitable impedance by formula (1) expression, to prevent that the noise that produces in one of the first device region and second device region is transmitted on the acceptable degree actually.As mentioned above, the specific embodiment of non-conductive parts comprises that (i) is formed on the insulation layer and the pn junction plane that (ii) is formed in this path in this path.In (i), R is increased, to increase the Z in the formula (1).In (ii), C is reduced, to increase the Z in the formula (1).As long as the transmission of noise can be reduced to the level of hope or following, then the conductive barrier by non-conductive parts is exactly suitable.Namely, as long as noise transmission is prevented from, weak current is acceptable.
The example of above-mentioned (i) is following structure; namely in comprising the zone of non-conductive parts; Semiconductor substrate and guard ring are configured the dielectric film isolation of non-conductive parts, and in the zone except the zone that comprises non-conductive parts, guard ring is connected with Semiconductor substrate.In this structure, in formula (1), comprise that the non-conductive parts of dielectric film have large R, so that it can stop conduction.
The example of above-mentioned (ii) is following structure, namely at the near surface of Semiconductor substrate, the diffusion layer that has with the conduction type of the conductivity type opposite of Semiconductor substrate is set; In the zone that comprises the diffusion layer with films of opposite conductivity, guard ring is connected to the surface of Semiconductor substrate; And the junction plane in the diffusion layer consists of non-conductive parts.At this, according to formula (1), C can be reduced, suitably to increase Z.Therefore, can effectively stop noise transmission between the first device region and the second device region.The impurities concentration distribution that has in the diffusion layer of films of opposite conductivity can be selected from all kinds, without any specific restriction.
The aspect of above-mentioned (ii) is effective especially for the structure that the analogy and digital circuit device is formed in the first device region or the second device region.In this structure, when the noise that produces transmits by above-mentioned path, can suitably increase impedance Z by the total capacitance C that effectively reduces in this path in the digital circuit device.In formula (1) ω hour, this effect can be more remarkable, effectively to stop the transmission of low-frequency noise.
As mentioned above, the inventor finds: the noise that produces in particular device region is transferred to another device region by the guard ring such as sealing ring, causes for example device fault in another device region.In the present invention, form the non-conductive parts of formation in the district at guard ring.Non-conductive parts stop from the first device region by the conduction of guard ring to the path of the second device region, thereby can stop reliably the noise transmission between the first and second device regions.
Therefore, according to the present invention, can effectively stop the noise transmission by the guard ring between two device regions.
To make above-mentioned and other purpose of the present invention, advantage and feature more obvious from the detailed description below in conjunction with accompanying drawing, wherein:
Fig. 1 shows the plane graph according to the structure of the semiconductor device of the embodiment of the invention.
Fig. 2 is the sectional view along the line I-I ' of Fig. 1.
Fig. 3 is the sectional view along the line II-II ' of Fig. 1.
Fig. 4 shows the sectional view according to the semiconductor device of the embodiment of the invention.
Fig. 5 shows the sectional view according to the semiconductor device of the embodiment of the invention.
Fig. 6 shows the plane graph according to the semiconductor device of the embodiment of the invention.
Fig. 7 is the sectional view along the line I-I ' of Fig. 6.
Fig. 8 shows the sectional view according to the semiconductor device of the embodiment of the invention.
Fig. 9 shows the plane graph according to the semiconductor device of the embodiment of the invention.
Figure 10 shows the plane graph according to the semiconductor device of the embodiment of the invention.
Figure 11 shows the plane graph of semiconductor device.
Figure 12 is the sectional view along the line I-I ' of Figure 11.
Figure 13 shows the plane graph of semiconductor device.
Referring now to illustrative embodiment the present invention is described.Those skilled in the art will recognize that, use of the present invention telling about to finish many optionally embodiment, and the present invention is not limited to the embodiment that illustrates for the illustrative purpose.
Describe below with reference to the accompanying drawings embodiments of the invention in detail.In all these accompanying drawings, common element represents by identical mark, and its description is suitably omitted.For these embodiment, guard ring mainly described be the situation of the sealing ring that forms along the edge of Semiconductor substrate.But the present invention is not limited to this situation, forms in any suitable zone in the surface but guard ring can be disposed in device in the substrate.This will describe with reference to Figure 10 in the back.
Fig. 1 shows the plane graph of the structure of the semiconductor chip in the present embodiment.Semiconductor chip 100 shown in Figure 1 comprises two device regions, i.e. logical block 151 in the silicon substrate 101 (regional A) and analogue unit 153 (regional B).Semiconductor chip 100 comprises the annular sealing ring district 106 that surrounds these device regions along cutting planes 103.It is the exemplary configurations that is made of three stacked annular conductive plugs that the below will describe the sealing ring 105 (Fig. 2 and 3) that forms in the sealing ring district 106.
Fig. 2 is the sectional view along the line I-I ' of Fig. 1, and Fig. 3 is the sectional view along the line II-II ' of Fig. 1.Fig. 2 and 3 each show structure of sealing ring district 106 and contiguous this regional internal circuit.
Semiconductor chip 100 shown in Fig. 1 to 3 is the semiconductor device that comprise following structure: the first and second device regions (logical block 151 and analogue unit 153), and it comprises Semiconductor substrate (silicon substrate 101); Be formed on the insulating intermediate layer (the first dielectric film 123, the second dielectric film 127, the 3rd dielectric film 131, the 4th dielectric film 135, pentasyllabic quatrain velum 139 and the 6th dielectric film 143) on the Semiconductor substrate; And the conducting film of in insulating intermediate layer, burying (the first conducting ring 125, the second conducting ring 129, the 3rd conducting ring 133, the 4th conducting ring 137, the 5th conducting ring 141 and the 6th conducting ring 145).
The semiconductor chip 100 that comprises ring protection ring (sealing ring 105) has the structure that non-conductive parts 104 are blocked in path conduction that forms in the guard ring formation district (sealing ring district 106); ring protection ring (sealing ring 105) surrounds the periphery of logical block 151 or analogue unit 153, and sealing ring 105 is passed through to analogue unit 153 from logical block 151 in this path.In this embodiment, sealing ring 105 surrounds the periphery of logical block 151 and analogue unit 153.
Sealing ring 105 is along the edge placement of silicon substrate 101 and surround logical block 151 and the periphery of analogue unit 153.Sealing ring 105 comprises a plurality of annular conducting film along the edge of silicon substrate 101, and a plurality of annular conducting films are stacked by insulating intermediate layer.
Non-conductive parts 104 are arranged near logical block 151 or the analogue unit 153.In this embodiment, sealing ring 105 is near logical block 151 and analogue unit 153.Non-conductive parts 104 have the flat shape that extend in direct whole zone below the first conducting ring 125.
In the sealing ring district 106 in semiconductor chip 100, be formed with the first diffusion layer (p near the surface of silicon substrate 101 +Diffusion layer 113) and and p +Second diffusion layer (n trap 111) of the lower surface of diffusion layer contact, the first diffusion layer have the conduction type identical with silicon substrate 101, and the second diffusion layer has the conduction type opposite with silicon substrate 101.Sealing ring 105 and p +The Surface Contact of diffusion layer 113.p +The lower surface of the lower surface of diffusion layer 113 and n trap 111 consists of non-conductive parts 104.p +The side periphery of diffusion layer 113 is covered by device isolation film 121 and insulate.
In this structure, sealing ring 105 comprises by the stacked a plurality of annular conducting film of insulating intermediate layer.In forming the zone of non-conductive parts 104, sealing ring 105 comprises and is connected to p +A plurality of column conductive plugs on the surface of diffusion layer 113.In the zone that forms non-conductive parts 104, conductive plug can be arranged to the grid (diagonallattice) at diagonal angle in the plane.
In Fig. 1 to 3, semiconductor chip 100 will be described in further detail.
Shown in Fig. 2 and 3, in semiconductor chip 100, on silicon substrate 101 (p substrate), sequentially form the first dielectric film 123, the second dielectric film 127, the 3rd dielectric film 131, the 4th dielectric film 135, pentasyllabic quatrain velum 139, the 6th dielectric film 143 and passivating film 147.
Logical block 151 and analogue unit 153 are included in n trap 111 adjacent one another are and the p trap 109 of the near surface of silicon substrate 101.The end of p trap 109 is in logical block 151 or analogue unit 153.
On the surface of the silicon substrate 101 that comprises n trap 111, form successively gate oxidation films 117 and gate electrode 119.P as source/drain region is set in the zone on the n trap 111 in silicon substrate 101 +Diffusion layer 113 and n +Diffusion layer 115.In addition, on p trap 109, form successively gate oxidation films 117 and gate electrode 119.N as source/drain region is set in the zone on the p trap 109 in silicon substrate 101 +Diffusion layer 115 and p +Diffusion layer 113.p +Diffusion layer and n +Diffusion layer 115 is isolated by device isolation film 121.
p +Diffusion layer 113, n +Diffusion layer 115 is connected with gate electrode to be connected to and is connected embolism 124.Connecting embolism 124 is the conductive plugs that are buried in the first dielectric film 123 and run through the first dielectric film 123.The upper surface that connects embolism 124 is connected to first interconnection 126 of burying in the second dielectric film 127.
In forming the zone (sealing ring district 106) of sealing ring 105, form n trap 111 at the near surface of silicon substrate 101 (p substrate), and with the Surface Contact ground formation p of p trap 109 +Diffusion layer 113.Each p +The side periphery of diffusion layer 113 is insulated by device isolation film 121.Be arranged on the first conducting ring 125 in the first dielectric film 123 and be connected to p on its basal surface +The bottom of the second conducting ring 129 on diffusion layer 113 and its upper surface.From the first conducting ring 125 towards the direction on upper strata, sequentially connect the second conducting ring 129, the 3rd conducting ring 133, the 4th conducting ring 137, the 5th conducting ring 141 and the 6th conducting ring 145.N trap 111 in the sealing ring district 106 and the p trap 109 in the analogue unit 153 are by silicon substrate 101 (p substrate) separately.
The second conducting ring 129, the 3rd conducting ring 133, the 4th conducting ring 137, the 5th conducting ring 141 and the 6th conducting ring 145 are made and are run through these dielectric films by being buried in electric conducting material in the groove that is formed in the second dielectric film 127, the 3rd dielectric film 131, the 4th dielectric film 135, pentasyllabic quatrain velum 139 and the 6th dielectric film 143 respectively.These conducting rings are by making such as the metal of copper (Cu), and can form by suitable method, such as single mosaic technology and dual-damascene technics.
Connect embolism 124 and the first conducting ring 125 and be arranged in the horizontal plane identical with the layer structure (ground floor) that form on the silicon substrate 101, and they can be formed by identical material in a technique.Equally, the first interconnection 126 is arranged in the horizontal plane identical with top layer structure with the second conducting ring 129, and they can be formed by identical material in a technique.
Between the sealing ring 105 and silicon substrate 101 that are consisted of by the first conducting ring 125 to the 6th conducting rings 145, two pn knots are arranged, namely,
(i) p +Knot between diffusion layer 113 and the n trap 111; And
(ii) knot between n trap 111 and the silicon substrate 101.
Near the junction interface in these pn knot parts, form carrier depletion layer, cause the generation of electric capacity.In this embodiment, this electric capacity is arranged in series and is passing through sealing ring 105 to the path of analogue unit 153 from logical block 151.Therefore, knot is as non-conductive parts 104, and the summation that also can reduce the capacitor C in the formula (1), causes the impedance Z in the path to increase.
The below uses description to make the technique of semiconductor chip 100 as shown in Figures 1 to 3.
Can by example such as existing technique as described below, prepare semiconductor chip 100.At first, form device isolation films 121 (STI: shallow trench isolation from) at silicon substrate 101.Next, form gate oxidation films 117 at silicon substrate 101, such as SiO 2Then film forms gate electrode 119 on it, such as polysilicon film, and form grid in the given area on silicon substrate 101.Then, form p trap 109 and n trap 111 in the precalculated position near silicon substrate 101 surfaces.And, in p trap 109 and n trap 111 pre-position near silicon substrate 101 surfaces, form p +Diffusion layer 113 and n +Diffusion layer 115.
Subsequently, deposit the first dielectric film 123 on the whole upper surface of silicon substrate 101, and by photoetching formation mask graph, the zone of mask graph in will forming the first dielectric film 123 that connects embolism 124 and the first conducting ring 125 has opening.Then, form the zone that connects embolism 124 and the first conducting ring 125 is removed selectively.Then, be formed for connecting the metal film of embolism 124 and the first conducting ring 125 at the whole upper surface of silicon substrate 101.This metal film can be by for example consisting of as the barrier metal film of stacked film and tungsten (W) film of filling recess, and this stacked film sequentially forms titanium (Ti) film and titanium nitride (TiN) film from the bottom, and tungsten (W) film contacts with barrier metal film.Then remove metal film on the first dielectric film 123 by for example CMP (chemico-mechanical polishing).Therefore, form connection embolism 124 and the first conducting ring 125.
Next, the whole upper surface at the first dielectric film 123 forms the second dielectric film 127.As mentioned above, remove selectively the zone in second dielectric film 127 that will form the first interconnection the 126 and second conducting ring 129, to form recess.Then, on the whole upper surface of the second dielectric film 127, sequentially form as the barrier metal film of multilayer film and the Cu film of filling recess, this multilayer film sequentially forms tantalum (Ta) film and tantalum nitride (TaN) film from the bottom, the Cu film contacts with barrier metal film.And, remove the metal film that forms on the second dielectric film 127 by for example CMP.Therefore, form the first interconnection the 126 and second conducting ring 129.
Equally, form continuously the 3rd dielectric film 131, the 3rd conducting ring 133, the 4th dielectric film 135, the 4th conducting ring 137, pentasyllabic quatrain velum 139, the 5th conducting ring 141, the 6th dielectric film 143 and the 6th conducting ring 145 by mosaic technology.Then, form passivating film 147 such as multilayer film at the whole upper surface of the 6th conducting ring 145, in this multilayer film, sequentially form SiN film, SiO from the bottom 2Film, SiO 2Film and SiN film.In the zone of the ratio sealing ring 105 more close cutting planes 103 in passivating film 147, can form ring-shaped groove, the periphery that it runs through passivating film 147 and surrounds sealing ring 105.Therefore, in the cutting step in making semiconductor chip 100, can stop more reliably and crackedly transmit towards substrate interior.As mentioned above, can prepare semiconductor chip 100.
The first dielectric film 123 to the 6th dielectric films 143 can be SiO for example 2Film.These insulating intermediate layers can be film having low dielectric constants.Film having low dielectric constant for example refers to have 3.5 or the film of following certain dielectric constant " k " as used herein.The example of this film comprises SiOC film, hydrogen polysiloxanes film, methyl polysiloxane film, methylhydrogenpolysi,oxane film and has been made into these films of porous.Film having low dielectric constant can be made by organic polymer.
Between dielectric film, that is to say, between the first to the 6th dielectric film 123 to 143, can form the dielectric film such as the SiN film, it is as etching stopping film or diffusion impervious layer.
Next, will the effect of semiconductor chip 100 be described.
In semiconductor chip 100, in as the sealing ring district 106 in the zone that forms sealing ring 105, form non-conductive parts 104.In non-conductive parts 104, pass through p as the first conducting ring 125 of the bottom of sealing ring 105 +Diffusion layer 113 is connected to n trap 111, and n trap 111 has the conduction type opposite with silicon substrate 101.Between the first conducting ring 125 and silicon substrate 101, form the pn knot as non-conductive parts 104.Sealing ring 105 and silicon substrate 101 are caused depletion layer to be expanded in this knot by the isolation of the capacitive junctions in the non-conductive parts 104.Therefore, by the impedance meeting increase of formula (1) expression, to stop noise transmission.And, be connected to the p of the first conducting ring 125 +The side periphery of diffusion layer 113 is isolated by device isolation film 121 and is insulated with silicon substrate 101.Can also stop from p +The transverse sides of diffusion layer 113 is by the noise transmission path of silicon substrate 101.
Therefore, it can stop in the logical block 151 noise that produces by for example successively from the path transmission of silicon substrate 101, sealing ring 105 and silicon substrate 101 to analogue unit 153.Therefore, can prevent that the device in the analogue unit 153 from breaking down.
In this embodiment, near logical block 151 and analogue unit 153, at p +Between diffusion layer 113 and the n trap 111 and between n trap 111 and silicon substrate 101 (p substrate), two knots as non-conductive parts 104 and conductivity type opposite are arranged.Therefore,, compare with the structure of parts that have conductivity type opposite described in the embodiment 2 and 3 (Figure 4 and 5) such as the back, can stop more reliably low-frequency noise to be transferred to analogue unit 153.
Among the embodiment 2 and 3 that describes in the back, comprise non-conductive parts 104 near the zone logical block 151 and analogue unit 153.Therefore, compare with the structure near non-conductive parts 104 only are formed on analogue unit 153 the zone, can the how non-conductive parts 104 of arranged in series 153 the path from logical block 151 to analogue unit, as described in the embodiment 4 to 6 of back.
In this embodiment, have and the diffusion layer of the conduction type of the surface opposite of silicon substrate 101 below the non-conductive parts 104 that form are junction planes between n trap 111 and the silicon substrate 101 (p substrate).Therefore, the junction capacitance in the non-conductive parts 104 is n less than non-conductive parts 104 +Junction capacitance in the structure of the junction plane between diffusion layer 115 and the silicon substrate 101 is as described in the embodiment 3 of back.
As mentioned above, in semiconductor chip 100, to the conductive path of analogue unit 153, in series arranging nearly four non-conductive parts 104 by sealing ring 105 from logical block 151.And, can suitably be reduced as the electric capacity in the pn knot of non-conductive parts 104, suitably to reduce the C in the above-mentioned formula (1).Therefore, the summation of the capacitor C in this path can be reduced effectively, suitably to increase impedance Z.ω in above-mentioned formula (1) hour, this effect is significant, causes more effectively reducing the transmission of the low-frequency noise in the semiconductor chip 100.
In semiconductor chip 100, can with logical block 151 and analogue unit 153 in the p that forms +Form the p as non-conductive parts 104 in diffusion layer 113 step simultaneously +Diffusion layer 113.And, also can with logical block 151 and analogue unit 153 in form n trap 111 as non-conductive parts 104 in n trap 111 step simultaneously that forms.Therefore, can easily make this structure, and not be used to form any additional manufacturing step of non-conductive parts 104.
In addition, in semiconductor chip 100, non-conductive parts 104 are formed on the whole zone that will form sealing ring 105.Therefore, compare with the embodiment 4 to 6 that describes later, can further simplify device architecture, cause the manufacturing of device easier.
In the whole periphery of sealing ring 105, the Surface Contact of sealing ring 105 and silicon substrate 101.Therefore, in the whole periphery of the cutting planes 103 in semiconductor 100, compare with the embodiment 7 that describes later, guaranteed suitably its function as sealing ring.And the whole upper surface of sealing ring 105 is passivated film 147 and covers.This can prevent that the cracked arrival that produces in the cutting process is at logical block 151 or the analogue unit 153 of the internal placement of sealing ring 105.In addition, protected semiconductor chip 100 to avoid impact from moisture or the ion of outside atmosphere.
Because the Surface Contact of sealing ring 105 and silicon substrate 101, even therefore using plasma in making sealing ring 105 as described in Example 7, electric charge also can be discharged into silicon substrate.Therefore, can prevent because the charge storage in the sealing ring 105 that this manufacturing process causes.Therefore, in the function that guarantees fully as sealing ring 105, can prevent the noise transmission between logical block 151 and the analogue unit 153 and can increase reliability in the manufacturing.
Therefore, scatter in the chip owing to the digital noise that reduces to be caused by sealing ring 105 in semiconductor chip 100, therefore, this chip can suitably be used for for example having digital block and simulation region semiconductor integrated circuit together.
In Fig. 2 and 3, described n trap 111 in the sealing ring district 106 and the p trap 109 segregate structures in logical block 151 or the analogue unit 153, but these parts can contact with each other.N trap 111 and p trap 109 by the structure of silicon substrate 101 (p substrate) isolation in, shown in Fig. 2 and 3, pn knot part in the cross side of n trap 111 becomes the knot between n trap 111 and the silicon substrate 101 (p substrate), so that compare with the structure that p trap 109 contacts with the n trap 111 in the pn knot, can reduce junction capacitance.Therefore, the impedance between logical block 151 and the analogue unit 153 can more effectively be increased, more effectively to stop the noise transmission by the cross side of n trap 111.
In Fig. 2 and 3, show in each of the first conducting ring 125 and form p +The structure of diffusion layer 113.But, can form a public p +Diffusion layer 113 is used for these first conducting rings 125.By each first conducting ring 125 is formed p isolator +Diffusion layer 113, the effect that increases impedance can be more remarkable.
In Fig. 2 and 3, show the structure that forms a n trap 111 at the whole basal surface of the sealing ring 105 that is consisted of by a plurality of (being in this embodiment three) annular conductive component.N trap 111 can be formed on each p isolator +Below the diffusion layer 113.Therefore, the noise transmission between logical block 151 and the analogue unit 153 can more effectively be stoped.
In Fig. 2 and 3, show the structure that in the first dielectric film 123, forms annular recess and in this recess, bury the first conducting ring 125.At this, in this embodiment and other embodiment, a plurality of cylindrical recess in the first dielectric film 123 and to be used to form the recess that connects embolism 124 can be isogonism ground, can bury a plurality of column conductive plugs in each recess, it connects the second conducting ring 129 and has the cross sectional shape (Fig. 2 and 3) identical with the first conducting ring 125.Use the conductive plug of column to replace the first conducting ring 125, in the layer of the first dielectric film 123, can increase the resistance of sealing ring 105, thereby can stop more reliably low-frequency noise to be transferred to analogue unit 153.
When the conductive plug that uses column in the first dielectric film 123 replaced the first conducting ring 125, a plurality of conductive plugs can be arranged to the grid at diagonal angle, such as (hound's-tooth) grid staggered in the plane.Therefore, the layer of the first dielectric film 123 also can more effectively be used as sealing ring 105.
In the following embodiments, will the each side that be different among the embodiment 1 be described mainly.
In embodiment 1 described semiconductor chip, sealing ring district 106 can have following cross section structure.In the present embodiment, also can planar structure in the semiconductor chip be described with reference to figure 1.Fig. 4 shows the sectional view according to the structure of the semiconductor device of the present embodiment.Although Fig. 4 shows along the sectional view of the line II-II ' of Fig. 1, corresponding to the Fig. 3 among the embodiment 1, I-I ' cross section can have the structure among Fig. 4, and wherein the analogue unit among Fig. 4 153 is logical blocks 151.
As shown in Figure 4, the semiconductor device of the present embodiment comprises diffusion layer (n +Diffusion layer 115 and n trap 111), it has the conduction type opposite with silicon substrate 101, and near the surface of silicon substrate, and sealing ring 105 is connected to n +The surface of diffusion layer 115.And the junction plane in the n trap 111 is non-conductive component 104.
In this structure, sealing ring 105 comprises a plurality of conducting rings (the first conducting ring 125 to the 6th conducting rings 145), and it is adjacent by the first dielectric film 123 to the 6th dielectric films 143.In the zone that forms non-conductive parts 104, sealing ring 105 comprises a plurality of column conductive plugs on the surface that is connected to n trap 111.In the zone that forms non-conductive parts 104, conductive plug can be arranged to the grid at diagonal angle in the plane.
More particularly, logical block 151 and analogue unit 153 can have as described in Example 1 cross section structure.As shown in Figure 4, the basic structure in sealing ring district 106 is shown in Fig. 2 and 3, except the n trap in silicon substrate 101 forms n +Diffusion layer 115 replaces p +The bottom of diffusion layer 113 and the first conducting ring 125 is connected to and forms n +Outside the surface of the silicon substrate 101 of diffusion layer 115.Each n +The transverse circumference of diffusion layer 115 is covered by device isolation film 121 and is isolated from each other.
Among Fig. 4 and Fig. 5 that the back is described, show the n that forms isolation into each the first conducting ring 125 in embodiment 3 and 6 +The structure of diffusion layer 115, but can form public n for each first conducting ring 125 +Diffusion layer 115.By being the n that each first conducting ring 125 forms isolation +Diffusion layer 115, the effect that increases impedance can be more remarkable.
Fig. 4 shows at a plurality of (being three in Fig. 4) n +The structure of the n trap 111 that extend below in the whole zone of diffusion layer 115, but as described in Example 1, can be at each n +The following n trap 111 that forms isolator of diffusion layer 115.Therefore, can more effectively stop noise transmission between logical block 151 and the analogue unit 153.
In addition, in this embodiment, the bottom of sealing ring 105, namely, the Surface Contact of the bottom of the first conducting ring 125 and silicon substrate 101, wherein the surface of silicon substrate 101 comprises the n that has with silicon substrate 101 (p substrate) films of opposite conductivity +Diffusion layer 115.At n +Form knot between n trap 111 below the diffusion layer 115 and the silicon substrate 101 (p substrate), as non-conductive parts 104.Two non-conductive parts 104 that form by pn knot in series be arranged in from logical block 151 by sealing ring 105 to the path of analogue unit 153, sealing ring 105 and silicon substrate 101 are isolated by the capacitive junctions in the non-conductive parts 104, thereby can increase impedance, to stop noise transmission, as described in Example 1.
And, the structure of this embodiment is compared with the structure of the following examples 3, embodiment 3 (Fig. 5) comprises the directly n of the near surface of the silicon substrate 101 (p substrate) below the first conducting ring 125 +Diffusion layer 115, and the present embodiment (Fig. 4) also comprises n trap 111 except n diffusion layer 115.Electric capacity between n trap 111 and the silicon substrate 101 is less than n +Electric capacity between diffusion layer 115 and the silicon substrate 101.Therefore compare with embodiment 3, structure shown in Figure 4 can reduce junction capacitance.Therefore, the present embodiment has following feature: can more effectively increase impedance by non-conductive parts 104, cause stoping more reliably noise transmission.
In addition, in Fig. 4, the p trap 109 in the n trap 111 in the sealing ring district 106 and logical block 151 or the analogue unit 153 is isolated, such as Fig. 2 and 3.Therefore, the structure that contacts to form the pn knot with n trap 111 with p trap 109 is compared, and can reduce junction capacitance.Therefore, can more effectively increase impedance between logical block 151 and the analogue unit 153.
In the semiconductor chip of describing in embodiment 1, sealing ring district 106 can have following cross section structure.In addition, in the present embodiment, also can planar structure in the semiconductor chip be described with reference to figure 1.Fig. 5 shows the sectional view according to the structure of the semiconductor device of the present embodiment.Although Fig. 5 shows along the sectional view of the line II-II ' of Fig. 1, it is corresponding to the Fig. 3 among the embodiment 1, and I-I ' cross section can have the structure among Fig. 5, and wherein the analogue unit among Fig. 5 153 is logical blocks 151.
As shown in Figure 5, in the semiconductor device of the present embodiment, sealing ring district 106 has the basic structure as the semiconductor chip among the embodiment 2, except not forming the n trap 111 in silicon substrate 101.
In addition, in this embodiment, the bottom of sealing ring 105, namely, the Surface Contact of the bottom of the first conducting ring 125 and silicon substrate 101, the surface of silicon substrate 101 comprises the n that has with silicon substrate 101 (p substrate) films of opposite conductivity +Diffusion layer 115.At n +The knot that forms between diffusion layer 115 and the silicon substrate 101 (p substrate) is as non-conductive parts 104.Therefore, in this embodiment, as in embodiment 2, to the path of analogue unit 153, in series arranging two non-conductive parts 104 that form by the pn knot by sealing ring 105 from logical block 151, and sealing ring 105 and silicon substrate 101 are isolated by the capacitive junctions in the non-conductive parts 104, thereby can increase impedance, to stop noise transmission.
In Fig. 5, be each formation n of a plurality of the first conducting rings 125 +Diffusion layer 115.Therefore, with n of formation below the whole zone of a plurality of the first conducting rings 125 +The structure of diffusion layer 115 is compared, and the effect that increases impedance can be more remarkable.
In addition, in this embodiment, not 106 extensions in the sealing ring district of p trap 109, but stop in logical block 151 or analogue unit 153 places.And the pn junction plane that is used as non-conductive parts 104 is n +Junction plane between diffusion layer 115 and the silicon substrate 101 (p substrate).If p trap 109 is 106 extensions in the sealing ring district, the pn junction plane is n so +Junction plane between diffusion layer 115 and the p trap 109.On the contrary, in this embodiment, by not forming p trap 109, but form n +Junction plane between diffusion layer 115 and the silicon substrate 101 (p substrate) can further reduce junction capacitance.Therefore, can more effectively increase impedance, to stop more reliably noise transmission.
Although in embodiment 1 to 3,106 form non-conductive parts 104 in whole sealing ring district, the non-conductive parts 104 shown in Fig. 3 to 5 can be formed on logical block 151 at least or analogue unit 153 near.With reference near the structure that analogue unit 153, forms non-conductive parts 104, the embodiment of the present embodiment and back is described particularly.And, in the present embodiment, description is had the as described in Example 1 structure of non-conductive parts 104.The back is semiconductor chips as described in embodiment 2 or 3 describing respectively non-conductive parts 104 in embodiment 5 or 6.
Fig. 6 shows the plane graph according to the structure of the semiconductor chip of the present embodiment.Semiconductor chip shown in Figure 6 has such as the described basic structure of semiconductor chip 100 (Fig. 1) among the embodiment 1, except sealing ring district 106 comprises first area 106a and second area 106b, wherein first area 106a has the cross section structure shown in Figure 7 of back, and second area 106b has aforesaid cross section structure shown in Figure 3.First area 106a is the zone that does not have non-conductive parts 104, and second area 106b is the zone that comprises non-conductive parts 104.
Fig. 7 is the sectional view along the line I-I ' of Fig. 6.Fig. 7 shows the cross section structure of first area 106a.In Fig. 7, from logical block 151 to sealing ring district 106, near the upper surface of silicon substrate 101, form p trap 109.The p of the Surface Contact of formation and p trap 109 +Diffusion layer 113.p +Transverse circumference in the diffusion layer 113 is isolated from each other by device isolation film 121.The bottom of the first conducting ring 125 with have a p +The Surface Contact of the silicon substrate 101 of diffusion layer 113.
In semiconductor chip shown in Figure 7, II-II ' cross section has the structure that the Fig. 3 in the reference example 1 describes.Sealing ring district 106 among Fig. 3 is corresponding to the second area 106b among this embodiment.
In addition, with reference to figure 6, for example, second area 106b can be formed in the zone of contiguous analogue unit 153.And, except the zone of contiguous analogue unit 153, can also preferably be formed in the zone spaced apart by a predetermined distance, for example, the logical block 151 in the substrate plane and the smallest margin between the analogue unit 153.
More particularly, suppose that the minimum range between the end of the end of logical block 151 in substrate plane and analogue unit 153 is L, second area 106b extends to a position so, and the zone of the contiguous analogue unit 153 of this positional distance and the end of analogue unit 153 are about length L.Therefore, can stop more reliably the noise that produces in the logical block 151 to be transferred to analogue unit 153 via sealing ring 105.
In the structure of the present embodiment, sealing ring district 106 be in the zone of contiguous analogue unit 153 and near the second area 106b that comprises non-conductive parts 104.Therefore, the noise transmission by sealing ring 105 can be prevented from, such as embodiment 1.
In the present embodiment, between the first conducting ring 125 and silicon substrate 101, second area 106b comprises that they are at p as two junction planes of the non-conductive parts 104 of conductivity type opposite +Between diffusion layer 113 and the n trap 111, and between n trap 111 and silicon substrate 101 (p substrate).Therefore, two non-conductive parts 104 that formed by two pn knots in series are arranged in from logical block 151 passes through sealing ring 105 to the path of analogue unit 153.Therefore, compare with the structure that forms parts of conductivity type opposite in embodiment 5 as described later and 6 the path, can stop more reliably low-frequency noise to be transferred to analogue unit 153.
The structure of describing among the embodiment 2 (Fig. 4) can be applied in the zone of contiguous analogue unit 153 among the embodiment 4 and near the second area 106b of formation.
In addition, in this structure, sealing ring district 106 comprises in the zone of contiguous analogue unit 153 and near non-conductive parts 104.Therefore, to the path of analogue unit 153, non-conductive parts 104 that formed by the pn knot are being arranged by sealing ring 105 from logical block 151.Therefore, as described in Example 4, can stop the noise transmission by sealing ring 105.
With the structure of the present embodiment and embodiment 6 relatively, in embodiment 6, at the direct near surface of the silicon substrate 101 below the first conducting ring 125 n is arranged +Diffusion layer 115, and n is not only arranged in the present embodiment +Diffusion layer 115 and n trap 111 is arranged.Therefore, compare with embodiment 6, the junction capacitance among this embodiment can be less.Namely, in this structure, can increase significantly impedance by forming non-conductive parts 104.Therefore, can stop more reliably noise transmission.
The structure of describing among the embodiment 3 (Fig. 5) can be applied in the zone of contiguous analogue unit 153 among the embodiment 4 and near the second area 106b of formation.
In addition, in this structure, sealing ring district 106 comprises in the zone of contiguous analogue unit 153 and near non-conductive parts 104.Therefore, to the path of analogue unit 153, non-conductive parts 104 that formed by the pn knot are being arranged by sealing ring 105 from logical block 151.Therefore, as described in embodiment 4 and 5, can stop the noise transmission by sealing ring 105.
In above embodiment, tie to increase impedance by the pn that forms as non-conductive parts 104 in the conductive path between logical block 151 and analogue unit 153, so that the path between logical block 151 and the analogue unit 153 is non-conductive.As long as non-conductive parts 104 can stop from logical block 151 by the conductive path of sealing ring 105 to analogue unit 153, then it can have arbitrary structures, can have following structure particularly, namely sealing ring 105 has breach (defective) parts that are buried in the dielectric film.
The semiconductor chip of the present embodiment also has the flat shape shown in Figure 6 among the embodiment 4 to 6.And the structure in the I-I ' cross section among Fig. 6 is as described in reference to figure 7, and the structure in II-II ' cross section as shown in Figure 8.Fig. 8 shows the sectional view according to the structure of the semiconductor chip of the present embodiment.
As shown in Figure 8, near the second area 106b (in the present embodiment, analogue unit 153) logical block 151 or analogue unit 153 that comprises non-conductive parts 104.
Among the second area 106b that comprises non-conductive parts 104 in the sealing ring district 106, silicon substrate 101 and sealing ring 105 are by 123 isolation of the first dielectric film, and the first dielectric film 123 consists of non-conductive parts 104.And in the zone except the second area 106b that comprises non-conductive parts 104 (first area 106a), sealing ring 105 is connected to silicon substrate 101.
More particularly, the basic structure of second area 106b is as described in to first area 106a shown in Figure 7, in p trap 109 terminates in analogue unit 153 and do not form in second area 106b the first conducting ring 125.In second area 106b, the bottom of sealing ring 105 is second conducting rings 129 that are adjacent to the first dielectric film 123, and as the first dielectric film 123 of non-conductive parts 104 between sealing ring 105 and silicon substrate 101.Sealing ring 105 and silicon substrate 101 are by 123 insulation of the first dielectric film.
In addition, in the present embodiment, second area 106b can be formed, as described in Example 4 in the zone of contiguous analogue unit 153.And, except the zone of contiguous analogue unit 153, can also preferably be formed in the zone spaced apart by a predetermined distance, for example the smallest margin between the logical block in the substrate plane 151 and the analogue unit 153.
The below will describe the effect according to the semiconductor chip of the present embodiment (Fig. 6 to 8).
The semiconductor chip of the present embodiment comprises the first conducting ring 125 of partly breach in the layer of the first dielectric film 123.Particularly, as shown in Figure 8, limited the sealing ring district 106 that forms sealing ring 105 by second area 106b, second area 106b comprises in the zone of contiguous analogue unit 153 and near non-conductive parts 104.In second area 106b, the bottom of sealing ring 105 contacts with the first dielectric film 123, thus sealing ring 105 are connected with silicon substrate and connect by the first conducting ring 125, but by 123 insulation of the first dielectric film, namely non-conductive.Therefore, non-conductive parts 104 can be the zones that has large R in the superincumbent formula (1), to increase impedance Z.Therefore, this structure can stop the noise that produces in the logical block 151 for example to be sent to analogue unit 153 by the path that sequentially is made of silicon substrate 101, sealing ring 105 and silicon substrate 101.Therefore, can stop the device in the analogue unit 153 to break down.
Sealing ring 105 does not only contact with silicon substrate 101 in second area 106b, and in the 106a of first area, the p in the first conducting ring 125 and the silicon substrate 101 +The Surface Contact of diffusion layer 113.And conducting ring jaggy only is the first conducting ring 125 among the second area 106b, and another conducting ring is formed on the whole periphery circlewise.Therefore, suitably guaranteed function as sealing ring on the whole periphery of the cutting planes in semiconductor chip 100 103.
Although technical field is different, the open No.2002-270608 of Japanese unsettled publication has described a kind of semiconductor device, and it comprises the conductor fence that consists of moisture-protective ring.This semiconductor device is included in the dielectric film of burying in the silicon substrate.This conductor fence is connected to dielectric film by the conductor region such as the polysilicon on the whole periphery.
After research, the inventor finds: the manufacturing process that is used for above structure may generating device damage, cracked such as the Cu film that consists of the conductor fence or dielectric film.This looks like because be connected to the structure of the dielectric film on the whole periphery for the conductor fence, electric charge can not be escaped from the conductor fence, thereby electric charge is easy to be stored in the conductor fence, for example, in the plasma resonance process in manufacturing process, the electric charge of this storage is easy to cause damage in element.
On the contrary, in the semiconductor chip of the present embodiment (Fig. 6 to 8), in the zone of contiguous analogue unit 153 and near, sealing ring district 106 is first area 106a.In the 106a of first area, the first conducting ring 125 is connected to the zone that has with silicon substrate 101 identical conduction types, particularly, is connected to and comprises p +The surface of the silicon substrate 101 of diffusion layer 113.Therefore, even when in the technique that is used to form sealing ring 105, using plasma, also can stop the charge storage in the sealing ring 105, effectively electric charge is discharged into silicon substrate 101.Therefore, in this structure, can stop from logical block 151 to analogue unit 153 noise transmission, and can further increase and make stability.Therefore, in this semiconductor chip 100, can stop reliably because the component wear that manufacturing process causes.
In above embodiment, described sealing ring 105 and be in the zone of contiguous analogue unit 153 and near the semiconductor chip of annular closed ring, in substrate, extended on the in-plane as the zone of the non-conductive parts 104 of the conduction between baffle seal ring 105 and the silicon substrate 101.But sealing ring 105 can be jagged circle partly, and this structure can comprise: the insulating intermediate layer of cutting sealing ring 105 in the normal of silicon substrate 101, and as non-conductive parts 104.
Particularly, in second area 106b, sealing ring 105 is included in a plurality of cylindrical conductors of burying in the first dielectric film 123 to the 6th dielectric films 143 of mutual isolation, and a plurality of cylindrical conductor is arranged as the grid at diagonal angle in the plane.The first dielectric film 123 to the 6th dielectric films 143 of isolating a plurality of cylindrical conductors are the zones that have large R value in the superincumbent formula (1), and it is as non-conductive parts 104.
Additionally, the structure of the present embodiment can with any one combination of aforesaid embodiment 1 to 7, to stop more reliably noise transmission.
Fig. 9 shows the plane graph of the structure of this semiconductor chip.In semiconductor chip shown in Figure 9, in second area 106b, from the top to bottom cutting sealing ring 105.In second area 106b, the strip ring shaped conductor with the cross sectional shape shown in Fig. 3 to 6 is arranged to the grid at diagonal angle, particularly, and staggered (hound's-tooth) grid.
Although some embodiments of the present invention have been described with reference to the drawings, these only are illustrative, can adopt except the various structures the structure as mentioned above.
For example, are sealing rings 105 of three ring shaped conductors although top embodiment has described sealing ring 105, the number of the ring shaped conductor in the sealing ring 105 is restriction not, and can suitably select this number.A plurality of by adopting sealing ring 105 to comprise, the structure of three or above ring shaped conductor particularly, even when forming non-conductive parts 104, also can more effectively show it as the basic function of sealing ring 105.
Although above embodiment has described in the interior structures that form sealing rings 105 along cutting planes 103 of cutting planes 103, sealing ring 105 is not to form along cutting planes 103, such as the back with reference to as described in Figure 10.
Although top embodiment has described the structure that sealing ring 105 surrounds the periphery of logical block 151 and analogue unit 153; but semiconductor chip can adopt the arbitrary structures of above-described embodiment, and wherein semiconductor chip comprises at least one the guard ring that surrounds logical block 151 and analogue unit 153.
Particularly, can adopt structure shown in Figure 10, wherein arrange the ring protection ring of the periphery that surrounds logical block 151 and analogue unit 153 in the outside of guard ring.And the arbitrary structures of describing in above-described embodiment can be applied to form the zone of guard ring, as sealing ring 106.In addition, in this structure, in the zone of contiguous analogue unit 153 and near can form at least one non-conductive parts 104, be sent to analogue unit 153 from logical block 151 by sealing ring 105 to stop noise.
Although above-described embodiment has been described the structure that logical block 151 and analogue unit 153 comprise complementary field-effect transistor, the structure of logical block 151 or analogue unit 153 is not limited to this.And; although above-described embodiment has been described device region and the formation that logical block 151 and analogue unit 153 form in the silicon substrate 101 and has been surrounded at least protection structure of rings of the periphery of logical block 151; but device region is not limited to logical block 151 or analogue unit 153; and can adopt following replacing structure; wherein there is at least one device region that the noise transmission problem can occur, and in the zone that protected ring surrounds, forms in this zone and another device region at least one.
The present invention is not limited to above-described embodiment obviously, can improve and change under the condition that does not depart from the scope of the present invention with spirit.
1. semiconductor device with first and second device regions comprises:
The insulating intermediate layer that forms in described Semiconductor substrate,
Consist of and surround the ring protection ring (106) of the periphery of described the first device region by a plurality of column conductive plugs of burying in the described insulating intermediate layer and run through described insulating intermediate layer,
Well region with conduction type identical with the conduction type of described Semiconductor substrate, wherein said well region is formed in the described Semiconductor substrate of described the first device region, the second diffusion layer (115) be formed in the described well region and have with described the first device region in the conduction type of conductivity type opposite of described Semiconductor substrate;
Form at guard ring and to form non-conductive parts in the district, these non-conductive parts stop from described the first device region by the described guard ring conduction the path of described the second device region extremely;
At the near surface of described Semiconductor substrate, form at guard ring the first diffusion layer (115) that has with the conduction type of the conductivity type opposite of described Semiconductor substrate is set in the district;
The lower surface of described guard ring contacts with the upper surface of described the first diffusion layer; And
Junction plane between described the first diffusion layer and described Semiconductor substrate consists of described non-conductive parts,
Wherein said the first diffusion layer (115) separates with described the second diffusion layer (115),
Wherein said non-conductive parts between described the first diffusion layer and described well region, and
Wherein in comprising the zone of described non-conductive parts, described a plurality of column conductive plugs are arranged as the grid at diagonal angle in the plane.
2. according to claim 1 semiconductor device, wherein said non-conductive parts be formed on described first or described the second device region near.
3. according to claim 1 semiconductor device, wherein said guard ring also surrounds the periphery of described the second device region.
4. according to claim 1 semiconductor device, wherein said a plurality of column conductive plugs are adjacent one another are.
5. according to claim 1 semiconductor device, wherein said non-conductive parts have the flat shape that extend in the direct whole district below described a plurality of column conductive plugs.
6. according to claim 1 semiconductor device, wherein said guard ring forms along the edge of described Semiconductor substrate.
CN 200810144562 2004-11-16 2005-11-16 Semiconductor device CN101355059B (en)
JP2004332349 2004-11-16
JP2004-332349 2004-11-16
JP2004332349A JP4689244B2 (en) 2004-11-16 2004-11-16 Semiconductor device
CN 200510125334 Division CN100508171C (en) 2004-11-16 2005-11-16 Semiconductor device
CN101355059A CN101355059A (en) 2009-01-28
CN101355059B true CN101355059B (en) 2013-10-16
ID=36385372
CN 200510125334 CN100508171C (en) 2004-11-16 2005-11-16 Semiconductor device
CN 200810144562 CN101355059B (en) 2004-11-16 2005-11-16 Semiconductor device
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Patentee after: Renesas Electronics Corporation
Patentee before: Renesas Electronics Corporation