US20200168598A1 - Silicon controlled rectifier - Google Patents
Silicon controlled rectifier Download PDFInfo
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- US20200168598A1 US20200168598A1 US16/202,297 US201816202297A US2020168598A1 US 20200168598 A1 US20200168598 A1 US 20200168598A1 US 201816202297 A US201816202297 A US 201816202297A US 2020168598 A1 US2020168598 A1 US 2020168598A1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 47
- 239000010703 silicon Substances 0.000 title claims abstract description 47
- 239000000758 substrate Substances 0.000 claims abstract description 64
- 239000004065 semiconductor Substances 0.000 abstract description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
- H01L29/87—Thyristor diodes, e.g. Shockley diodes, break-over diodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0207—Geometrical layout of the components, e.g. computer aided design; custom LSI, semi-custom LSI, standard cell technique
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- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0259—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using bipolar transistors as protective elements
- H01L27/0262—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using bipolar transistors as protective elements including a PNP transistor and a NPN transistor, wherein each of said transistors has its base coupled to the collector of the other transistor, e.g. silicon controlled rectifier [SCR] devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0684—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by the shape, relative sizes or dispositions of the semiconductor regions or junctions between the regions
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- H—ELECTRICITY
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0684—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by the shape, relative sizes or dispositions of the semiconductor regions or junctions between the regions
- H01L29/0692—Surface layout
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- H—ELECTRICITY
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41716—Cathode or anode electrodes for thyristors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/70—Bipolar devices
- H01L29/74—Thyristor-type devices, e.g. having four-zone regenerative action
Definitions
- the present invention relates to a rectifier, particularly to a silicon controlled rectifier that reduces the surface area of a semiconductor substrate.
- TVS Transient voltage suppressor
- FIG. 1 The working principle of TVS is shown in FIG. 1 .
- the TVS device 10 is connected in parallel with the protected circuit 12 on the printed circuit board (PCB).
- the TVS device 10 would be triggered immediately when the ESD event occurs. In that way, the TVS device 10 can provide a superiorly low resistance path for discharging the transient ESD current, so that the energy of the ESD transient current can be bypassed by the TVS device 10 .
- Silicon-controlled rectifier (SCR) devices exhibit strong ESD robustness and strong current discharge capacity per unit area. SCR devices are widely used as on-chip structures for electrostatic discharge (ESD) protection.
- ESD electrostatic discharge
- Zener diode triggered SCR alternatively referred to as Zener-triggered SCR
- Conventional SCR devices face the problems of lower current discharge capacity per unit area.
- the present invention provides a silicon controlled rectifier, so as to solve the afore-mentioned problems of the prior art.
- a primary objective of the present invention is to provide a silicon controlled rectifier, which arranges at least one N-type heavily-doped area or at least one P-type heavily-doped area outside a first P-type strip-shaped heavily-doped area and a first N-type strip-shaped heavily-doped area to reduce the surface area of a semiconductor substrate and enhance the electrostatic discharge (ESD) efficiency.
- ESD electrostatic discharge
- the present invention provides a silicon controlled rectifier, which comprises a P-type substrate, a N-type doped well arranged in the P-type substrate, a first P-type strip-shaped heavily-doped area arranged in the N-type doped well, a first N-type strip-shaped heavily-doped area arranged in the P-type substrate, a second P-type strip-shaped heavily-doped area arranged in the P-type substrate, and at least one N-type heavily-doped area arranged in the P-type substrate and the N-type doped well.
- the first N-type strip-shaped heavily-doped area is arranged in parallel to the first P-type strip-shaped heavily-doped area.
- the second P-type strip-shaped heavily-doped area is arranged in the P-type substrate and arranged in parallel to the first N-type strip-shaped heavily-doped area.
- the at least one N-type heavily-doped area is arranged outside the first P-type strip-shaped heavily-doped area and the first N-type strip-shaped heavily-doped area and closer to the first P-type strip-shaped heavily-doped area rather than the first N-type strip-shaped heavily-doped area, and the at least one N-type heavily-doped area is not arranged between the first P-type strip-shaped heavily-doped area and the first N-type strip-shaped heavily-doped area.
- the first P-type strip-shaped heavily-doped area is coupled to an anode, and the first N-type strip-shaped heavily-doped area and the second P-type strip-shaped heavily-doped area are coupled to a cathode.
- the P-type substrate is a P-type lightly-doped substrate and the N-type doped well is an N-type lightly-doped well.
- the at least one N-type heavily-doped area further comprises two N-type heavily-doped areas.
- the second P-type strip-shaped heavily-doped area contacts the first N-type strip-shaped heavily-doped area.
- the silicon controlled rectifier further comprises a second N-type strip-shaped heavily-doped area coupled to the anode and arranged in the N-type doped well and arranged in parallel to the first P-type strip-shaped heavily-doped area, and the at least one N-type heavily-doped area is closer to the second N-type strip-shaped heavily-doped area rather than the first N-type strip-shaped heavily-doped area.
- the first P-type strip-shaped heavily-doped area contacts the second N-type strip-shaped heavily-doped area.
- the silicon controlled rectifier further comprises at least one P-type heavily-doped area, the at least one P-type heavily-doped area is arranged in the P-type substrate to contact the at least one N-type heavily-doped area, and the at least one N-type heavily-doped area is arranged between the at least one P-type heavily-doped area and the first P-type strip-shaped heavily-doped area.
- the silicon controlled rectifier further comprises at least one P-type heavily-doped area, the at least one P-type heavily-doped area is arranged in the P-type substrate and the at least one N-type heavily-doped area, the at least one P-type heavily-doped area is deeper rather than the at least one N-type heavily-doped area, and a part of the sidewall of the at least one P-type heavily-doped area is surrounded by the at least one N-type heavily-doped area.
- the present invention also provides a silicon controlled rectifier, which comprises an N-type substrate, a P-type doped well arranged in the N-type substrate, a first N-type strip-shaped heavily-doped area arranged in the P-type doped well, a first P-type strip-shaped heavily-doped area arranged in the N-type substrate, a second P-type strip-shaped heavily-doped area arranged in the P-type doped well, and at least one P-type heavily-doped area arranged in the N-type substrate and the P-type doped well.
- the first P-type strip-shaped heavily-doped area is arranged in parallel to the first N-type strip-shaped heavily-doped area.
- the second P-type strip-shaped heavily-doped area is arranged in parallel to the first N-type strip-shaped heavily-doped area.
- the at least one P-type heavily-doped area is arranged outside the first N-type strip-shaped heavily-doped area and the first P-type strip-shaped heavily-doped area and closer to the first N-type strip-shaped heavily-doped area and the second P-type strip-shaped heavily-doped area rather than the first P-type strip-shaped heavily-doped area, and the at least one P-type heavily-doped area is not arranged between the first N-type strip-shaped heavily-doped area and the first P-type strip-shaped heavily-doped area.
- the first N-type strip-shaped heavily-doped area and the second P-type strip-shaped heavily-doped area are coupled to a cathode, and the first P-type strip-shaped heavily-doped area is coupled to an anode.
- the at least one P-type heavily-doped area further comprises two P-type heavily-doped areas.
- the second P-type strip-shaped heavily-doped area contacts the first N-type strip-shaped heavily-doped area.
- the silicon controlled rectifier further comprises a second N-type strip-shaped heavily-doped area coupled to the anode and arranged in the N-type substrate and arranged in parallel to the first P-type strip-shaped heavily-doped area.
- the first P-type strip-shaped heavily-doped area contacts the second N-type strip-shaped heavily-doped area.
- the silicon controlled rectifier further comprises at least one N-type heavily-doped area arranged in the N-type substrate to contact the at least one P-type heavily-doped area, and the at least one P-type heavily-doped area is arranged between the at least one N-type heavily-doped area and the first N-type strip-shaped heavily-doped area.
- the silicon controlled rectifier further comprises at least one N-type heavily-doped area arranged in the N-type substrate and the at least one P-type heavily-doped area, the at least one N-type heavily-doped area is deeper rather than the at least one P-type heavily-doped area, and a part of the sidewall of the at least one N-type heavily-doped area is surrounded by the at least one P-type heavily-doped area.
- FIG. 1 is a schematic diagram illustrating a transient voltage suppressor (TVS) connected with a protected circuit;
- TVS transient voltage suppressor
- FIG. 2 is a layout schematically showing a silicon controlled rectifier according to the first embodiment of the present invention
- FIG. 3 is a sectional view taken along Line A-A′ of FIG. 2 ;
- FIG. 4 is a sectional view taken along Line B-B′ of FIG. 2 ;
- FIG. 5 is a sectional view taken along Line C-C′ of FIG. 2 ;
- FIG. 6 is a layout schematically showing a silicon controlled rectifier according to the second embodiment of the present invention.
- FIG. 7 is a sectional view taken along Line D-D′ of FIG. 6 ;
- FIG. 8 is a sectional view taken along Line E-E′ of FIG. 6 ;
- FIG. 9 is a layout schematically showing a silicon controlled rectifier according to the third embodiment of the present invention.
- FIG. 10 is a sectional view taken along Line F-F′ of FIG. 9 ;
- FIG. 11 is a sectional view taken along Line G-G′ of FIG. 9 ;
- FIG. 12 is a layout schematically showing a silicon controlled rectifier according to the fourth embodiment of the present invention.
- FIG. 13 is a layout schematically showing a silicon controlled rectifier according to the fifth embodiment of the present invention.
- FIG. 14 is a layout schematically showing a silicon controlled rectifier according to the sixth embodiment of the present invention.
- FIG. 15 is a layout schematically showing a silicon controlled rectifier according to the seventh embodiment of the present invention.
- FIG. 16 is a sectional view taken along Line H-H′ of FIG. 15 ;
- FIG. 17 is a sectional view taken along Line I-I′ of FIG. 15 ;
- FIG. 18 is a sectional view taken along Line J-J′ of FIG. 15 ;
- FIG. 19 is a layout schematically showing a silicon controlled rectifier according to the eighth embodiment of the present invention.
- FIG. 20 is a sectional view taken along Line K-K′ of FIG. 19 ;
- FIG. 21 is a sectional view taken along Line L-L′ of FIG. 19 ;
- FIG. 22 is a layout schematically showing a silicon controlled rectifier according to the ninth embodiment of the present invention.
- FIG. 23 is a sectional view taken along Line M-M′ of FIG. 22 ;
- FIG. 24 is a sectional view taken along Line O-O′ of FIG. 22 ;
- FIG. 25 is a layout schematically showing a silicon controlled rectifier according to the tenth embodiment of the present invention.
- FIG. 26 is a layout schematically showing a silicon controlled rectifier according to the eleventh embodiment of the present invention.
- FIG. 27 is a layout schematically showing a silicon controlled rectifier according to the twelfth embodiment of the present invention.
- the first embodiment of a silicon controlled rectifier (SCR) is introduced as follows.
- the SCR comprises a P-type substrate 14 , an N-type doped well 16 arranged in the P-type substrate 14 , a first P-type strip-shaped heavily-doped area 18 arranged in the N-type doped well 16 , a first N-type strip-shaped heavily-doped area 20 arranged in the P-type substrate 14 , a second P-type strip-shaped heavily-doped area 22 arranged in the P-type substrate 14 , a second N-type strip-shaped heavily-doped area 24 arranged in the N-type doped well 16 , and at least one N-type heavily-doped area 26 arranged in the P-type substrate 14 and the N-type doped well 16 .
- the first P-type strip-shaped heavily-doped area 18 and the second N-type strip-shaped heavily-doped area 24 are coupled to an anode
- the first N-type strip-shaped heavily-doped area 20 and the second P-type strip-shaped heavily-doped area 22 are coupled to a cathode.
- the cathode may be grounded.
- the number of the N-type heavily-doped area 26 is two
- the P-type substrate 14 is a P-type lightly-doped substrate
- the N-type doped well 16 is an N-type lightly-doped well.
- the first N-type strip-shaped heavily-doped area 20 is arranged in parallel to the first P-type strip-shaped heavily-doped area 18 .
- the second P-type strip-shaped heavily-doped area 22 is arranged in parallel to the first N-type strip-shaped heavily-doped area 20 .
- the second N-type strip-shaped heavily-doped area 24 is arranged in parallel to the first P-type strip-shaped heavily-doped area 18 .
- the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 are commonly arranged between the second P-type strip-shaped heavily-doped area 22 and the second N-type strip-shaped heavily-doped area 24 .
- the N-type heavily-doped areas 26 are arranged outside the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 and closer to the first P-type strip-shaped heavily-doped area 18 and the second N-type strip-shaped heavily-doped area 24 rather than the first N-type strip-shaped heavily-doped area 20 and the second P-type strip-shaped heavily-doped area 22 .
- the N-type heavily-doped areas 26 are not arranged between the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 .
- each of the first P-type strip-shaped heavily-doped area 18 , the first N-type strip-shaped heavily-doped area 20 , the second P-type strip-shaped heavily-doped area 22 , and the second N-type strip-shaped heavily-doped area 24 has two ends and two sidewalls.
- the sidewall of the first P-type strip-shaped heavily-doped area 18 faces the sidewall of the second N-type strip-shaped heavily-doped area 24 .
- the sidewall of the first P-type strip-shaped heavily-doped area 18 faces the sidewall of the first N-type strip-shaped heavily-doped area 20 .
- the sidewall of the first N-type strip-shaped heavily-doped area 20 faces the sidewall of the second P-type strip-shaped heavily-doped area 22 .
- the N-type heavily-doped areas 26 are respectively closer to two ends of the first P-type strip-shaped heavily-doped area 18 rather than the sidewalls of the first P-type strip-shaped heavily-doped area 18 .
- the N-type heavily-doped areas 26 are respectively closer to two ends of the second N-type strip-shaped heavily-doped area 24 rather than the sidewalls of the second N-type strip-shaped heavily-doped area 24 .
- the first P-type strip-shaped heavily-doped area 18 , the first N-type strip-shaped heavily-doped area 20 , the second P-type strip-shaped heavily-doped area 22 , and the second N-type strip-shaped heavily-doped area 24 have to be arranged in parallel.
- the N-type heavily-doped areas 26 are not arranged between the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 , such that the surface area of the P-type substrate 14 is reduced. Due to existence of the N-type heavily-doped areas 26 , the ESD efficiency of the SCR is enhanced.
- the second N-type strip-shaped heavily-doped area 24 is used as an ohmic contact.
- the second N-type strip-shaped heavily-doped area 24 is alternatively omitted.
- the second embodiment of a SCR is introduced as follows.
- the second embodiment is different from the first embodiment in that the second embodiment further comprises at least one P-type heavily-doped area 28 .
- the number of the P-type heavily-doped area 28 is two.
- the P-type heavily-doped areas 28 are arranged in the P-type substrate 14 to respectively contact the N-type heavily-doped areas 26 .
- the N-type heavily-doped area 26 is arranged between the P-type heavily-doped area 28 and the first P-type strip-shaped heavily-doped area 18 .
- the N-type heavily-doped area 26 is arranged between the P-type heavily-doped area 28 and the second N-type strip-shaped heavily-doped area 24 .
- the third embodiment of a SCR is introduced as follows.
- the third embodiment is different from the first embodiment in that the third embodiment further comprises at least one P-type heavily-doped area 28 .
- the number of the P-type heavily-doped area 28 is two.
- the P-type heavily-doped areas 28 are arranged in the P-type substrate 14 and respectively arranged in the N-type heavily-doped areas 26 , and the P-type heavily-doped areas 28 are deeper rather than the N-type heavily-doped areas 26 .
- a part of the sidewall of the P-type heavily-doped area 28 is surrounded by the N-type heavily-doped area 26 .
- the fourth embodiment of a SCR is introduced as follows.
- the fourth embodiment is different from the first embodiment in positions of the first P-type strip-shaped heavily-doped area 18 , the first N-type strip-shaped heavily-doped area 20 , the second P-type strip-shaped heavily-doped area 22 , and the second N-type strip-shaped heavily-doped area 24 .
- the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 respectively separate from the second N-type strip-shaped heavily-doped area 24 and the second P-type strip-shaped heavily-doped area 22 .
- the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 respectively contact the second N-type strip-shaped heavily-doped area 24 and the second P-type strip-shaped heavily-doped area 22 .
- the fifth embodiment of a SCR is introduced as follows.
- the fifth embodiment is different from the second embodiment in positions of the first P-type strip-shaped heavily-doped area 18 , the first N-type strip-shaped heavily-doped area 20 , the second P-type strip-shaped heavily-doped area 22 , and the second N-type strip-shaped heavily-doped area 24 .
- the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 respectively separate from the second N-type strip-shaped heavily-doped area 24 and the second P-type strip-shaped heavily-doped area 22 .
- the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 respectively contact the second N-type strip-shaped heavily-doped area 24 and the second P-type strip-shaped heavily-doped area 22 .
- the sixth embodiment of a SCR is introduced as follows.
- the sixth embodiment is different from the third embodiment in positions of the first P-type strip-shaped heavily-doped area 18 , the first N-type strip-shaped heavily-doped area 20 , the second P-type strip-shaped heavily-doped area 22 , and the second N-type strip-shaped heavily-doped area 24 .
- the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 respectively separate from the second N-type strip-shaped heavily-doped area 24 and the second P-type strip-shaped heavily-doped area 22 .
- the first P-type strip-shaped heavily-doped area 18 and the first N-type strip-shaped heavily-doped area 20 respectively contact the second N-type strip-shaped heavily-doped area 24 and the second P-type strip-shaped heavily-doped area 22 .
- the seventh embodiment of a SCR is introduced as follows.
- the SCR comprises an N-type substrate 30 , a P-type doped well 32 arranged in the N-type substrate 30 , a first N-type strip-shaped heavily-doped area 34 arranged in the P-type doped well 32 , a first P-type strip-shaped heavily-doped area 36 arranged in the N-type substrate 30 , a second N-type strip-shaped heavily-doped area 38 arranged in the N-type substrate 30 , a second P-type strip-shaped heavily-doped area 40 arranged in the P-type doped well 32 , and at least one P-type heavily-doped area 42 arranged in the N-type substrate 30 and the P-type doped well 32 .
- the first N-type strip-shaped heavily-doped area 34 and the second P-type strip-shaped heavily-doped area 40 are coupled to a cathode, and the first P-type strip-shaped heavily-doped area 36 and the second N-type strip-shaped heavily-doped area 38 are coupled to an anode.
- the cathode may be grounded.
- the number of the P-type heavily-doped area 42 is two
- the N-type substrate 30 is an N-type lightly-doped substrate
- the P-type doped well 32 is a P-type lightly-doped well.
- the first P-type strip-shaped heavily-doped area 36 is arranged in parallel to the first N-type strip-shaped heavily-doped area 34 .
- the second P-type strip-shaped heavily-doped area 40 is arranged in parallel to the first N-type strip-shaped heavily-doped area 34 .
- the second N-type strip-shaped heavily-doped area 38 is arranged in parallel to the first P-type strip-shaped heavily-doped area 36 .
- the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 are commonly arranged between the second N-type strip-shaped heavily-doped area 38 and the second P-type strip-shaped heavily-doped area 40 .
- the P-type heavily-doped areas 42 are arranged outside the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 and closer to the first N-type strip-shaped heavily-doped area 34 and the second P-type strip-shaped heavily-doped area 40 rather than the first P-type strip-shaped heavily-doped area 36 and the second N-type strip-shaped heavily-doped area 38 .
- the P-type heavily-doped areas 42 are not arranged between the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 .
- each of the first N-type strip-shaped heavily-doped area 34 , the first P-type strip-shaped heavily-doped area 36 , the second N-type strip-shaped heavily-doped area 38 , and the second P-type strip-shaped heavily-doped area 40 has two ends and two sidewalls.
- the sidewall of the first N-type strip-shaped heavily-doped area 34 faces the sidewall of the second P-type strip-shaped heavily-doped area 40 .
- the sidewall of the first N-type strip-shaped heavily-doped area 34 faces the sidewall of the first P-type strip-shaped heavily-doped area 36 .
- the sidewall of the first P-type strip-shaped heavily-doped area 36 faces the second N-type strip-shaped heavily-doped area 38 .
- the P-type heavily-doped areas 42 are respectively closer to two ends of the first N-type strip-shaped heavily-doped area 34 rather than the sidewalls of the first N-type strip-shaped heavily-doped area 34 .
- the P-type heavily-doped areas 42 are respectively closer to two ends of the second P-type strip-shaped heavily-doped area 40 rather than the sidewalls of the second P-type strip-shaped heavily-doped area 40 .
- the first N-type strip-shaped heavily-doped area 34 , the first P-type strip-shaped heavily-doped area 36 , the second N-type strip-shaped heavily-doped area 38 , and the second P-type strip-shaped heavily-doped area 40 have to be arranged in parallel.
- the P-type heavily-doped areas 42 are not arranged between the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 , such that the surface area of the N-type substrate 30 is reduced. Due to existence of the P-type heavily-doped areas 42 , the ESD efficiency of the SCR is enhanced.
- the second N-type strip-shaped heavily-doped area 38 is used as an ohmic contact.
- the second N-type strip-shaped heavily-doped area 38 is alternatively omitted.
- the eighth embodiment of a SCR is introduced as follows.
- the eighth embodiment is different from the seventh embodiment in that the eighth embodiment further comprises at least one N-type heavily-doped area 44 .
- the number of the N-type heavily-doped area 44 is two.
- the N-type heavily-doped areas 44 are arranged in the N-type substrate 30 to contact the P-type heavily-doped areas 42 .
- the P-type heavily-doped area 42 is arranged between the N-type heavily-doped area 44 and the first N-type strip-shaped heavily-doped area 34 .
- the P-type heavily-doped area 42 is arranged between the N-type heavily-doped area 44 and the second P-type strip-shaped heavily-doped area 40 .
- the ninth embodiment of a SCR is introduced as follows.
- the ninth embodiment is different from the seventh embodiment in that the ninth embodiment further comprises at least one N-type heavily-doped area 44 .
- the number of the N-type heavily-doped area 44 is two.
- the N-type heavily-doped areas 44 are arranged in the N-type substrate 30 and respectively arranged in the P-type heavily-doped areas 42 .
- the N-type heavily-doped areas 44 are deeper rather than the P-type heavily-doped areas 42 .
- a part of the sidewall of the N-type heavily-doped area 44 is surrounded by the P-type heavily-doped area 42 .
- the tenth embodiment of a SCR is introduced as follows.
- the tenth embodiment is different from the seventh embodiment in positions of the first N-type strip-shaped heavily-doped area 34 , the first P-type strip-shaped heavily-doped area 36 , the second N-type strip-shaped heavily-doped area 38 , and the second P-type strip-shaped heavily-doped area 40 .
- the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 respectively separate from the second P-type strip-shaped heavily-doped area 40 and the second N-type strip-shaped heavily-doped area 38 .
- the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 respectively contact the second P-type strip-shaped heavily-doped area 40 and the second N-type strip-shaped heavily-doped area 38 .
- the eleventh embodiment of a SCR is introduced as follows.
- the eleventh embodiment is different from the eighth embodiment in positions of the first N-type strip-shaped heavily-doped area 34 , the first P-type strip-shaped heavily-doped area 36 , the second N-type strip-shaped heavily-doped area 38 , and the second P-type strip-shaped heavily-doped area 40 .
- the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 respectively separate from the second P-type strip-shaped heavily-doped area 40 and the second N-type strip-shaped heavily-doped area 38 .
- the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 respectively contact the second P-type strip-shaped heavily-doped area 40 and the second N-type strip-shaped heavily-doped area 38 .
- the twelfth embodiment of a SCR is introduced as follows.
- the twelfth embodiment is different from the ninth embodiment in positions of the first N-type strip-shaped heavily-doped area 34 , the first P-type strip-shaped heavily-doped area 36 , the second N-type strip-shaped heavily-doped area 38 , and the second P-type strip-shaped heavily-doped area 40 .
- the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 respectively separate from the second P-type strip-shaped heavily-doped area 40 and the second N-type strip-shaped heavily-doped area 38 .
- the first N-type strip-shaped heavily-doped area 34 and the first P-type strip-shaped heavily-doped area 36 respectively contact the second P-type strip-shaped heavily-doped area 40 and the second N-type strip-shaped heavily-doped area 38 .
- the present invention arranges at least one N-type heavily-doped area or at least one P-type heavily-doped area outside the first P-type strip-shaped heavily-doped area and the first N-type strip-shaped heavily-doped area to reduce the surface area of the semiconductor substrate and enhance the ESD efficiency.
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Abstract
Description
- The present invention relates to a rectifier, particularly to a silicon controlled rectifier that reduces the surface area of a semiconductor substrate.
- As the IC device sizes have been shrunk to nanometer scale, the consumer electronics, like the laptop and mobile devices, have been designed to be much smaller than ever. Without suitable protection devices, the functions of these electronics could be reset or even damaged under electrostatic discharge (ESD) events. Currently, all consumer electronics are expected to pass the ESD test requirement of IEC 61000-4-2 standard. Transient voltage suppressor (TVS) is generally designed to bypass the ESD energy, so that the electronic systems can be prevented from ESD damages.
- The working principle of TVS is shown in
FIG. 1 . InFIG. 1 , theTVS device 10 is connected in parallel with the protectedcircuit 12 on the printed circuit board (PCB). TheTVS device 10 would be triggered immediately when the ESD event occurs. In that way, theTVS device 10 can provide a superiorly low resistance path for discharging the transient ESD current, so that the energy of the ESD transient current can be bypassed by theTVS device 10. Silicon-controlled rectifier (SCR) devices exhibit strong ESD robustness and strong current discharge capacity per unit area. SCR devices are widely used as on-chip structures for electrostatic discharge (ESD) protection. When the on-chip structures are integrated in a low-operating power source IC device, the high triggering voltage of an SCR device faces limitations in the range of applications. Therefore, some advanced techniques, such as Zener diode triggered SCR (alternatively referred to as Zener-triggered SCR) devices have been proposed to enhance the ESD efficiency. However, conventional Zener-triggered SCR devices consume a large silicon real estate. Conventional SCR devices also face the problems of lower current discharge capacity per unit area. - To overcome the abovementioned problems, the present invention provides a silicon controlled rectifier, so as to solve the afore-mentioned problems of the prior art.
- A primary objective of the present invention is to provide a silicon controlled rectifier, which arranges at least one N-type heavily-doped area or at least one P-type heavily-doped area outside a first P-type strip-shaped heavily-doped area and a first N-type strip-shaped heavily-doped area to reduce the surface area of a semiconductor substrate and enhance the electrostatic discharge (ESD) efficiency.
- To achieve the abovementioned objectives, the present invention provides a silicon controlled rectifier, which comprises a P-type substrate, a N-type doped well arranged in the P-type substrate, a first P-type strip-shaped heavily-doped area arranged in the N-type doped well, a first N-type strip-shaped heavily-doped area arranged in the P-type substrate, a second P-type strip-shaped heavily-doped area arranged in the P-type substrate, and at least one N-type heavily-doped area arranged in the P-type substrate and the N-type doped well. The first N-type strip-shaped heavily-doped area is arranged in parallel to the first P-type strip-shaped heavily-doped area. The second P-type strip-shaped heavily-doped area is arranged in the P-type substrate and arranged in parallel to the first N-type strip-shaped heavily-doped area. The at least one N-type heavily-doped area is arranged outside the first P-type strip-shaped heavily-doped area and the first N-type strip-shaped heavily-doped area and closer to the first P-type strip-shaped heavily-doped area rather than the first N-type strip-shaped heavily-doped area, and the at least one N-type heavily-doped area is not arranged between the first P-type strip-shaped heavily-doped area and the first N-type strip-shaped heavily-doped area. The first P-type strip-shaped heavily-doped area is coupled to an anode, and the first N-type strip-shaped heavily-doped area and the second P-type strip-shaped heavily-doped area are coupled to a cathode.
- In an embodiment of the present invention, the P-type substrate is a P-type lightly-doped substrate and the N-type doped well is an N-type lightly-doped well.
- In an embodiment of the present invention, the at least one N-type heavily-doped area further comprises two N-type heavily-doped areas.
- In an embodiment of the present invention, the second P-type strip-shaped heavily-doped area contacts the first N-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the silicon controlled rectifier further comprises a second N-type strip-shaped heavily-doped area coupled to the anode and arranged in the N-type doped well and arranged in parallel to the first P-type strip-shaped heavily-doped area, and the at least one N-type heavily-doped area is closer to the second N-type strip-shaped heavily-doped area rather than the first N-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the first P-type strip-shaped heavily-doped area contacts the second N-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the silicon controlled rectifier further comprises at least one P-type heavily-doped area, the at least one P-type heavily-doped area is arranged in the P-type substrate to contact the at least one N-type heavily-doped area, and the at least one N-type heavily-doped area is arranged between the at least one P-type heavily-doped area and the first P-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the silicon controlled rectifier further comprises at least one P-type heavily-doped area, the at least one P-type heavily-doped area is arranged in the P-type substrate and the at least one N-type heavily-doped area, the at least one P-type heavily-doped area is deeper rather than the at least one N-type heavily-doped area, and a part of the sidewall of the at least one P-type heavily-doped area is surrounded by the at least one N-type heavily-doped area.
- The present invention also provides a silicon controlled rectifier, which comprises an N-type substrate, a P-type doped well arranged in the N-type substrate, a first N-type strip-shaped heavily-doped area arranged in the P-type doped well, a first P-type strip-shaped heavily-doped area arranged in the N-type substrate, a second P-type strip-shaped heavily-doped area arranged in the P-type doped well, and at least one P-type heavily-doped area arranged in the N-type substrate and the P-type doped well. The first P-type strip-shaped heavily-doped area is arranged in parallel to the first N-type strip-shaped heavily-doped area. The second P-type strip-shaped heavily-doped area is arranged in parallel to the first N-type strip-shaped heavily-doped area. The at least one P-type heavily-doped area is arranged outside the first N-type strip-shaped heavily-doped area and the first P-type strip-shaped heavily-doped area and closer to the first N-type strip-shaped heavily-doped area and the second P-type strip-shaped heavily-doped area rather than the first P-type strip-shaped heavily-doped area, and the at least one P-type heavily-doped area is not arranged between the first N-type strip-shaped heavily-doped area and the first P-type strip-shaped heavily-doped area. The first N-type strip-shaped heavily-doped area and the second P-type strip-shaped heavily-doped area are coupled to a cathode, and the first P-type strip-shaped heavily-doped area is coupled to an anode.
- In an embodiment of the present invention, the at least one P-type heavily-doped area further comprises two P-type heavily-doped areas.
- In an embodiment of the present invention, the second P-type strip-shaped heavily-doped area contacts the first N-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the silicon controlled rectifier further comprises a second N-type strip-shaped heavily-doped area coupled to the anode and arranged in the N-type substrate and arranged in parallel to the first P-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the first P-type strip-shaped heavily-doped area contacts the second N-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the silicon controlled rectifier further comprises at least one N-type heavily-doped area arranged in the N-type substrate to contact the at least one P-type heavily-doped area, and the at least one P-type heavily-doped area is arranged between the at least one N-type heavily-doped area and the first N-type strip-shaped heavily-doped area.
- In an embodiment of the present invention, the silicon controlled rectifier further comprises at least one N-type heavily-doped area arranged in the N-type substrate and the at least one P-type heavily-doped area, the at least one N-type heavily-doped area is deeper rather than the at least one P-type heavily-doped area, and a part of the sidewall of the at least one N-type heavily-doped area is surrounded by the at least one P-type heavily-doped area.
- Below, the embodiments are described in detail in cooperation with the drawings to make easily understood the technical contents, characteristics and accomplishments of the present invention.
-
FIG. 1 is a schematic diagram illustrating a transient voltage suppressor (TVS) connected with a protected circuit; -
FIG. 2 is a layout schematically showing a silicon controlled rectifier according to the first embodiment of the present invention; -
FIG. 3 is a sectional view taken along Line A-A′ ofFIG. 2 ; -
FIG. 4 is a sectional view taken along Line B-B′ ofFIG. 2 ; -
FIG. 5 is a sectional view taken along Line C-C′ ofFIG. 2 ; -
FIG. 6 is a layout schematically showing a silicon controlled rectifier according to the second embodiment of the present invention; -
FIG. 7 is a sectional view taken along Line D-D′ ofFIG. 6 ; -
FIG. 8 is a sectional view taken along Line E-E′ ofFIG. 6 ; -
FIG. 9 is a layout schematically showing a silicon controlled rectifier according to the third embodiment of the present invention; -
FIG. 10 is a sectional view taken along Line F-F′ ofFIG. 9 ; -
FIG. 11 is a sectional view taken along Line G-G′ ofFIG. 9 ; -
FIG. 12 is a layout schematically showing a silicon controlled rectifier according to the fourth embodiment of the present invention; -
FIG. 13 is a layout schematically showing a silicon controlled rectifier according to the fifth embodiment of the present invention; -
FIG. 14 is a layout schematically showing a silicon controlled rectifier according to the sixth embodiment of the present invention -
FIG. 15 is a layout schematically showing a silicon controlled rectifier according to the seventh embodiment of the present invention; -
FIG. 16 is a sectional view taken along Line H-H′ ofFIG. 15 ; -
FIG. 17 is a sectional view taken along Line I-I′ ofFIG. 15 ; -
FIG. 18 is a sectional view taken along Line J-J′ ofFIG. 15 ; -
FIG. 19 is a layout schematically showing a silicon controlled rectifier according to the eighth embodiment of the present invention; -
FIG. 20 is a sectional view taken along Line K-K′ ofFIG. 19 ; -
FIG. 21 is a sectional view taken along Line L-L′ ofFIG. 19 ; -
FIG. 22 is a layout schematically showing a silicon controlled rectifier according to the ninth embodiment of the present invention; -
FIG. 23 is a sectional view taken along Line M-M′ ofFIG. 22 ; -
FIG. 24 is a sectional view taken along Line O-O′ ofFIG. 22 ; -
FIG. 25 is a layout schematically showing a silicon controlled rectifier according to the tenth embodiment of the present invention; -
FIG. 26 is a layout schematically showing a silicon controlled rectifier according to the eleventh embodiment of the present invention; and -
FIG. 27 is a layout schematically showing a silicon controlled rectifier according to the twelfth embodiment of the present invention. - Reference will now be made in detail to embodiments illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. In the drawings, the shape and thickness may be exaggerated for clarity and convenience. This description will be directed in particular to elements forming part of, or cooperating more directly with, methods and apparatus in accordance with the present disclosure. It is to be understood that elements not specifically shown or described may take various forms well known to those skilled in the art. Many alternatives and modifications will be apparent to those skilled in the art, once informed by the present disclosure.
- Refer to
FIG. 2 ,FIG. 3 ,FIG. 4 , andFIG. 5 . The first embodiment of a silicon controlled rectifier (SCR) is introduced as follows. The SCR comprises a P-type substrate 14, an N-type doped well 16 arranged in the P-type substrate 14, a first P-type strip-shaped heavily-dopedarea 18 arranged in the N-type doped well 16, a first N-type strip-shaped heavily-dopedarea 20 arranged in the P-type substrate 14, a second P-type strip-shaped heavily-dopedarea 22 arranged in the P-type substrate 14, a second N-type strip-shaped heavily-dopedarea 24 arranged in the N-type doped well 16, and at least one N-type heavily-dopedarea 26 arranged in the P-type substrate 14 and the N-type doped well 16. The first P-type strip-shaped heavily-dopedarea 18 and the second N-type strip-shaped heavily-dopedarea 24 are coupled to an anode, and the first N-type strip-shaped heavily-dopedarea 20 and the second P-type strip-shaped heavily-dopedarea 22 are coupled to a cathode. The cathode may be grounded. In the first embodiment, the number of the N-type heavily-dopedarea 26 is two, the P-type substrate 14 is a P-type lightly-doped substrate, and the N-type doped well 16 is an N-type lightly-doped well. - The first N-type strip-shaped heavily-doped
area 20 is arranged in parallel to the first P-type strip-shaped heavily-dopedarea 18. The second P-type strip-shaped heavily-dopedarea 22 is arranged in parallel to the first N-type strip-shaped heavily-dopedarea 20. The second N-type strip-shaped heavily-dopedarea 24 is arranged in parallel to the first P-type strip-shaped heavily-dopedarea 18. The first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 are commonly arranged between the second P-type strip-shaped heavily-dopedarea 22 and the second N-type strip-shaped heavily-dopedarea 24. The N-type heavily-dopedareas 26 are arranged outside the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 and closer to the first P-type strip-shaped heavily-dopedarea 18 and the second N-type strip-shaped heavily-dopedarea 24 rather than the first N-type strip-shaped heavily-dopedarea 20 and the second P-type strip-shaped heavily-dopedarea 22. The N-type heavily-dopedareas 26 are not arranged between the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20. Specifically, each of the first P-type strip-shaped heavily-dopedarea 18, the first N-type strip-shaped heavily-dopedarea 20, the second P-type strip-shaped heavily-dopedarea 22, and the second N-type strip-shaped heavily-dopedarea 24 has two ends and two sidewalls. The sidewall of the first P-type strip-shaped heavily-dopedarea 18 faces the sidewall of the second N-type strip-shaped heavily-dopedarea 24. The sidewall of the first P-type strip-shaped heavily-dopedarea 18 faces the sidewall of the first N-type strip-shaped heavily-dopedarea 20. The sidewall of the first N-type strip-shaped heavily-dopedarea 20 faces the sidewall of the second P-type strip-shaped heavily-dopedarea 22. The N-type heavily-dopedareas 26 are respectively closer to two ends of the first P-type strip-shaped heavily-dopedarea 18 rather than the sidewalls of the first P-type strip-shaped heavily-dopedarea 18. The N-type heavily-dopedareas 26 are respectively closer to two ends of the second N-type strip-shaped heavily-dopedarea 24 rather than the sidewalls of the second N-type strip-shaped heavily-dopedarea 24. In order to increase the amount of the electrostatic discharge (ESD) current, the first P-type strip-shaped heavily-dopedarea 18, the first N-type strip-shaped heavily-dopedarea 20, the second P-type strip-shaped heavily-dopedarea 22, and the second N-type strip-shaped heavily-dopedarea 24 have to be arranged in parallel. However, in order to reduce the surface area of the P-type substrate 14, the N-type heavily-dopedareas 26 are not arranged between the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20, such that the surface area of the P-type substrate 14 is reduced. Due to existence of the N-type heavily-dopedareas 26, the ESD efficiency of the SCR is enhanced. - The second N-type strip-shaped heavily-doped
area 24 is used as an ohmic contact. Thus, the second N-type strip-shaped heavily-dopedarea 24 is alternatively omitted. - Refer to
FIG. 6 ,FIG. 7 , andFIG. 8 . The second embodiment of a SCR is introduced as follows. The second embodiment is different from the first embodiment in that the second embodiment further comprises at least one P-type heavily-dopedarea 28. In the second embodiment, the number of the P-type heavily-dopedarea 28 is two. The P-type heavily-dopedareas 28 are arranged in the P-type substrate 14 to respectively contact the N-type heavily-dopedareas 26. The N-type heavily-dopedarea 26 is arranged between the P-type heavily-dopedarea 28 and the first P-type strip-shaped heavily-dopedarea 18. The N-type heavily-dopedarea 26 is arranged between the P-type heavily-dopedarea 28 and the second N-type strip-shaped heavily-dopedarea 24. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 9 ,FIG. 10 , andFIG. 11 . The third embodiment of a SCR is introduced as follows. The third embodiment is different from the first embodiment in that the third embodiment further comprises at least one P-type heavily-dopedarea 28. In the third embodiment, the number of the P-type heavily-dopedarea 28 is two. The P-type heavily-dopedareas 28 are arranged in the P-type substrate 14 and respectively arranged in the N-type heavily-dopedareas 26, and the P-type heavily-dopedareas 28 are deeper rather than the N-type heavily-dopedareas 26. A part of the sidewall of the P-type heavily-dopedarea 28 is surrounded by the N-type heavily-dopedarea 26. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 12 . The fourth embodiment of a SCR is introduced as follows. The fourth embodiment is different from the first embodiment in positions of the first P-type strip-shaped heavily-dopedarea 18, the first N-type strip-shaped heavily-dopedarea 20, the second P-type strip-shaped heavily-dopedarea 22, and the second N-type strip-shaped heavily-dopedarea 24. In the first embodiment, the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 respectively separate from the second N-type strip-shaped heavily-dopedarea 24 and the second P-type strip-shaped heavily-dopedarea 22. In the fourth embodiment, the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 respectively contact the second N-type strip-shaped heavily-dopedarea 24 and the second P-type strip-shaped heavily-dopedarea 22. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 13 . The fifth embodiment of a SCR is introduced as follows. The fifth embodiment is different from the second embodiment in positions of the first P-type strip-shaped heavily-dopedarea 18, the first N-type strip-shaped heavily-dopedarea 20, the second P-type strip-shaped heavily-dopedarea 22, and the second N-type strip-shaped heavily-dopedarea 24. In the second embodiment, the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 respectively separate from the second N-type strip-shaped heavily-dopedarea 24 and the second P-type strip-shaped heavily-dopedarea 22. In the fifth embodiment, the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 respectively contact the second N-type strip-shaped heavily-dopedarea 24 and the second P-type strip-shaped heavily-dopedarea 22. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 14 . The sixth embodiment of a SCR is introduced as follows. The sixth embodiment is different from the third embodiment in positions of the first P-type strip-shaped heavily-dopedarea 18, the first N-type strip-shaped heavily-dopedarea 20, the second P-type strip-shaped heavily-dopedarea 22, and the second N-type strip-shaped heavily-dopedarea 24. In the third embodiment, the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 respectively separate from the second N-type strip-shaped heavily-dopedarea 24 and the second P-type strip-shaped heavily-dopedarea 22. In the sixth embodiment, the first P-type strip-shaped heavily-dopedarea 18 and the first N-type strip-shaped heavily-dopedarea 20 respectively contact the second N-type strip-shaped heavily-dopedarea 24 and the second P-type strip-shaped heavily-dopedarea 22. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 15 ,FIG. 16 ,FIG. 17 , andFIG. 18 . The seventh embodiment of a SCR is introduced as follows. The SCR comprises an N-type substrate 30, a P-type doped well 32 arranged in the N-type substrate 30, a first N-type strip-shaped heavily-dopedarea 34 arranged in the P-type doped well 32, a first P-type strip-shaped heavily-dopedarea 36 arranged in the N-type substrate 30, a second N-type strip-shaped heavily-dopedarea 38 arranged in the N-type substrate 30, a second P-type strip-shaped heavily-dopedarea 40 arranged in the P-type doped well 32, and at least one P-type heavily-dopedarea 42 arranged in the N-type substrate 30 and the P-type doped well 32. The first N-type strip-shaped heavily-dopedarea 34 and the second P-type strip-shaped heavily-dopedarea 40 are coupled to a cathode, and the first P-type strip-shaped heavily-dopedarea 36 and the second N-type strip-shaped heavily-dopedarea 38 are coupled to an anode. The cathode may be grounded. In the seventh embodiment, the number of the P-type heavily-dopedarea 42 is two, the N-type substrate 30 is an N-type lightly-doped substrate and the P-type doped well 32 is a P-type lightly-doped well. - The first P-type strip-shaped heavily-doped
area 36 is arranged in parallel to the first N-type strip-shaped heavily-dopedarea 34. The second P-type strip-shaped heavily-dopedarea 40 is arranged in parallel to the first N-type strip-shaped heavily-dopedarea 34. The second N-type strip-shaped heavily-dopedarea 38 is arranged in parallel to the first P-type strip-shaped heavily-dopedarea 36. The first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 are commonly arranged between the second N-type strip-shaped heavily-dopedarea 38 and the second P-type strip-shaped heavily-dopedarea 40. The P-type heavily-dopedareas 42 are arranged outside the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 and closer to the first N-type strip-shaped heavily-dopedarea 34 and the second P-type strip-shaped heavily-dopedarea 40 rather than the first P-type strip-shaped heavily-dopedarea 36 and the second N-type strip-shaped heavily-dopedarea 38. The P-type heavily-dopedareas 42 are not arranged between the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36. Specifically, each of the first N-type strip-shaped heavily-dopedarea 34, the first P-type strip-shaped heavily-dopedarea 36, the second N-type strip-shaped heavily-dopedarea 38, and the second P-type strip-shaped heavily-dopedarea 40 has two ends and two sidewalls. The sidewall of the first N-type strip-shaped heavily-dopedarea 34 faces the sidewall of the second P-type strip-shaped heavily-dopedarea 40. The sidewall of the first N-type strip-shaped heavily-dopedarea 34 faces the sidewall of the first P-type strip-shaped heavily-dopedarea 36. The sidewall of the first P-type strip-shaped heavily-dopedarea 36 faces the second N-type strip-shaped heavily-dopedarea 38. The P-type heavily-dopedareas 42 are respectively closer to two ends of the first N-type strip-shaped heavily-dopedarea 34 rather than the sidewalls of the first N-type strip-shaped heavily-dopedarea 34. The P-type heavily-dopedareas 42 are respectively closer to two ends of the second P-type strip-shaped heavily-dopedarea 40 rather than the sidewalls of the second P-type strip-shaped heavily-dopedarea 40. In order to increase the amount of the electrostatic discharge (ESD) current, the first N-type strip-shaped heavily-dopedarea 34, the first P-type strip-shaped heavily-dopedarea 36, the second N-type strip-shaped heavily-dopedarea 38, and the second P-type strip-shaped heavily-dopedarea 40 have to be arranged in parallel. In order to reduce the surface area of the N-type substrate 30, the P-type heavily-dopedareas 42 are not arranged between the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36, such that the surface area of the N-type substrate 30 is reduced. Due to existence of the P-type heavily-dopedareas 42, the ESD efficiency of the SCR is enhanced. - The second N-type strip-shaped heavily-doped
area 38 is used as an ohmic contact. Thus, the second N-type strip-shaped heavily-dopedarea 38 is alternatively omitted. - Refer to
FIG. 19 ,FIG. 20 , andFIG. 21 . The eighth embodiment of a SCR is introduced as follows. The eighth embodiment is different from the seventh embodiment in that the eighth embodiment further comprises at least one N-type heavily-dopedarea 44. In the eighth embodiment, the number of the N-type heavily-dopedarea 44 is two. The N-type heavily-dopedareas 44 are arranged in the N-type substrate 30 to contact the P-type heavily-dopedareas 42. The P-type heavily-dopedarea 42 is arranged between the N-type heavily-dopedarea 44 and the first N-type strip-shaped heavily-dopedarea 34. The P-type heavily-dopedarea 42 is arranged between the N-type heavily-dopedarea 44 and the second P-type strip-shaped heavily-dopedarea 40. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 22 ,FIG. 23 , andFIG. 24 . The ninth embodiment of a SCR is introduced as follows. The ninth embodiment is different from the seventh embodiment in that the ninth embodiment further comprises at least one N-type heavily-dopedarea 44. In the ninth embodiment, the number of the N-type heavily-dopedarea 44 is two. The N-type heavily-dopedareas 44 are arranged in the N-type substrate 30 and respectively arranged in the P-type heavily-dopedareas 42. The N-type heavily-dopedareas 44 are deeper rather than the P-type heavily-dopedareas 42. A part of the sidewall of the N-type heavily-dopedarea 44 is surrounded by the P-type heavily-dopedarea 42. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 25 . The tenth embodiment of a SCR is introduced as follows. The tenth embodiment is different from the seventh embodiment in positions of the first N-type strip-shaped heavily-dopedarea 34, the first P-type strip-shaped heavily-dopedarea 36, the second N-type strip-shaped heavily-dopedarea 38, and the second P-type strip-shaped heavily-dopedarea 40. In the seventh embodiment, the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 respectively separate from the second P-type strip-shaped heavily-dopedarea 40 and the second N-type strip-shaped heavily-dopedarea 38. In the tenth embodiment, the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 respectively contact the second P-type strip-shaped heavily-dopedarea 40 and the second N-type strip-shaped heavily-dopedarea 38. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 26 . The eleventh embodiment of a SCR is introduced as follows. The eleventh embodiment is different from the eighth embodiment in positions of the first N-type strip-shaped heavily-dopedarea 34, the first P-type strip-shaped heavily-dopedarea 36, the second N-type strip-shaped heavily-dopedarea 38, and the second P-type strip-shaped heavily-dopedarea 40. In the eighth embodiment, the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 respectively separate from the second P-type strip-shaped heavily-dopedarea 40 and the second N-type strip-shaped heavily-dopedarea 38. In the eleventh embodiment, the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 respectively contact the second P-type strip-shaped heavily-dopedarea 40 and the second N-type strip-shaped heavily-dopedarea 38. The other technical features have been described previously so will not be reiterated. - Refer to
FIG. 27 . The twelfth embodiment of a SCR is introduced as follows. The twelfth embodiment is different from the ninth embodiment in positions of the first N-type strip-shaped heavily-dopedarea 34, the first P-type strip-shaped heavily-dopedarea 36, the second N-type strip-shaped heavily-dopedarea 38, and the second P-type strip-shaped heavily-dopedarea 40. In the ninth embodiment, the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 respectively separate from the second P-type strip-shaped heavily-dopedarea 40 and the second N-type strip-shaped heavily-dopedarea 38. In the twelfth embodiment, the first N-type strip-shaped heavily-dopedarea 34 and the first P-type strip-shaped heavily-dopedarea 36 respectively contact the second P-type strip-shaped heavily-dopedarea 40 and the second N-type strip-shaped heavily-dopedarea 38. The other technical features have been described previously so will not be reiterated. - In conclusion, the present invention arranges at least one N-type heavily-doped area or at least one P-type heavily-doped area outside the first P-type strip-shaped heavily-doped area and the first N-type strip-shaped heavily-doped area to reduce the surface area of the semiconductor substrate and enhance the ESD efficiency.
- The embodiments described above are only to exemplify the present invention but not to limit the scope of the present invention. Therefore, any equivalent modification or variation according to the shapes, structures, features, or spirit disclosed by the present invention is to be also included within the scope of the present invention.
Claims (20)
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US5343053A (en) * | 1993-05-21 | 1994-08-30 | David Sarnoff Research Center Inc. | SCR electrostatic discharge protection for integrated circuits |
US6246079B1 (en) * | 1998-05-13 | 2001-06-12 | Winbond Electronics Corp. | SCR circuit with a high trigger current |
US20040178455A1 (en) * | 2003-03-14 | 2004-09-16 | Rohm Co., Ltd. | Semiconductor device |
US20090278168A1 (en) * | 2008-05-07 | 2009-11-12 | United Microelectronics Corp. | Structure of silicon controlled rectifier |
US20120205714A1 (en) * | 2011-02-11 | 2012-08-16 | Analog Devices, Inc. | Apparatus and method for protection of electronic circuits operating under high stress conditions |
US20150091054A1 (en) * | 2013-10-02 | 2015-04-02 | Taiwan Semiconductor Manufacturing Company, Ltd. | SCRs with Checker Board Layouts |
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US5856214A (en) | 1996-03-04 | 1999-01-05 | Winbond Electronics Corp. | Method of fabricating a low voltage zener-triggered SCR for ESD protection in integrated circuits |
US20110133247A1 (en) | 2009-12-08 | 2011-06-09 | Hossein Sarbishaei | Zener-Triggered SCR-Based Electrostatic Discharge Protection Devices For CDM And HBM Stress Conditions |
CN106298764B (en) | 2015-05-19 | 2019-06-28 | 中芯国际集成电路制造(上海)有限公司 | A kind of semiconductor devices and electronic device |
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US5343053A (en) * | 1993-05-21 | 1994-08-30 | David Sarnoff Research Center Inc. | SCR electrostatic discharge protection for integrated circuits |
US6246079B1 (en) * | 1998-05-13 | 2001-06-12 | Winbond Electronics Corp. | SCR circuit with a high trigger current |
US20040178455A1 (en) * | 2003-03-14 | 2004-09-16 | Rohm Co., Ltd. | Semiconductor device |
US20090278168A1 (en) * | 2008-05-07 | 2009-11-12 | United Microelectronics Corp. | Structure of silicon controlled rectifier |
US20120205714A1 (en) * | 2011-02-11 | 2012-08-16 | Analog Devices, Inc. | Apparatus and method for protection of electronic circuits operating under high stress conditions |
US20150091054A1 (en) * | 2013-10-02 | 2015-04-02 | Taiwan Semiconductor Manufacturing Company, Ltd. | SCRs with Checker Board Layouts |
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US10685954B1 (en) | 2020-06-16 |
TWI726385B (en) | 2021-05-01 |
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