US20100019318A1 - Device for esd protection circuit - Google Patents
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- US20100019318A1 US20100019318A1 US12/178,058 US17805808A US2010019318A1 US 20100019318 A1 US20100019318 A1 US 20100019318A1 US 17805808 A US17805808 A US 17805808A US 2010019318 A1 US2010019318 A1 US 2010019318A1
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- 210000000746 body region Anatomy 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000002955 isolation Methods 0.000 claims description 9
- 238000002513 implantation Methods 0.000 description 17
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- 238000000034 method Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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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
- H01L29/08—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 with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
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- H—ELECTRICITY
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- 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
- H01L29/0603—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0607—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0626—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 particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a localised breakdown region, e.g. built-in avalanching region
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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
- H01L29/08—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 with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
- H01L29/0852—Source or drain regions of field-effect devices of field-effect transistors with insulated gate of DMOS transistors
- H01L29/0873—Drain regions
- H01L29/0878—Impurity concentration or distribution
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42372—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out
- H01L29/4238—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out characterised by the surface lay-out
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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
- H01L29/66—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
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7816—Lateral DMOS transistors, i.e. LDMOS transistors
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- 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
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
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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
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0266—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using field effect transistors as protective elements
Definitions
- the present invention relates to a semiconductor device, and more particularly to a lateral diffused metal oxide semiconductor (LDMOS) device for an electrostatic discharge (ESD) protection circuit.
- LDMOS lateral diffused metal oxide semiconductor
- ESD electrostatic discharge
- ESD electrical overstress
- the ESD tolerance is getting worse as dimensions of devices are getting smaller.
- the design for ESD protection has been taken into account when designing ICs.
- the ESD tolerance for commercially available ICs is required to pass the human body mode (HBM) test at 2 kV and the machine model (MM) test at 200 V.
- the large-sized ESD protection device for ICs is usually applied.
- This large-sized device is designed as a multi-finger shape in the layout to save the chip area as much as possible.
- the present invention provides a LDMOS device having a higher ESD tolerance.
- the present invention provides a device for an ESD protection circuit, and the device includes at least one LDMOS device.
- the LDMOS device includes a substrate of a first conductivity type and a deep well region of a second conductivity type.
- the substrate includes a first area and a second area.
- the deep well region is disposed in the first and second areas of the substrate.
- the LDMOS device further includes a gate electrode, an implanted region of the first conductivity type, a grade region of the second conductivity type, a first doped region of the second conductivity type, a body region of the first conductivity type, a second doped region of the second conductivity type, and a doped region of the first conductivity type.
- the gate electrode is disposed on the substrate between the first and second areas.
- the implanted region is disposed in the first area of the substrate.
- the grade region is disposed in the deep well region of the first area.
- the first doped region is disposed in the grade region.
- the body region is disposed in the deep well region of the second area.
- the second doped region is disposed in the body region.
- the doped region is disposed in the body region and adjacent to the second doped region.
- the implanted region is disposed between the first doped region and the grade region.
- the implanted region is disposed below the first doped region.
- the implanted region is disposed in the grade region.
- the implanted region is disposed between the grade region and the deep well region.
- the implanted region is disposed in the deep well region.
- the first conductivity type is P-type and the second conductivity is N-type.
- the first conductivity type is N-type and the second conductivity is P-type.
- the LDMOS device further includes a lightly doped region of the second conductivity type.
- the lightly doped region is disposed in the body region between the gate electrode and the second doped region.
- the LDMOS device further includes a well region of the first conductivity type and a guard ring.
- the well region is disposed outside the deep well region.
- the guard ring is disposed in the well region.
- the LDMOS device further includes an isolation structure.
- the isolation structure is disposed between the second doped region and the guard ring.
- the isolation structure includes a FOX structure or a STI structure.
- the device for an ESD protection circuit includes a plurality of the LDMOS devices.
- a plurality of the gate electrodes of the LDMOS devices is connected to each other.
- the gate electrodes are connected to form a multi-finger shape.
- an implanted region is formed below the drain region, so that the ESD tolerance is significantly enhanced.
- FIG. 1 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to an embodiment of the present invention.
- FIG. 1A schematically illustrates a top view of a LDNMOS device for an ESD protection circuit according to an embodiment of the present invention.
- FIG. 2 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to another embodiment of the present invention.
- FIG. 3 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to yet another embodiment of the present invention.
- FIG. 4 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to still another embodiment of the present invention.
- FIG. 5 illustrates the electrical relation diagram upon measurement before the ESD LDNMOS device of the example is packaged.
- a LDMOS device for an ESD protection circuit can be a LDNMOS device or a LDPMOS device.
- a LDNMOS device in which the first conductivity type is P-type and the second conductivity type is N-type is provided for illustration purposes, and is not to be construed as limiting the scope of the present invention. It is appreciated by persons skilled in the art that the first conductivity type can be N-type and the second conductivity type can be P-type so as to form a LDPMOS device.
- a device for an ESD protection circuit including two LDNMOS devices is provided for illustration purposes, and is not to be construed as limiting the present invention.
- the number of the LDMOS devices for the ESD protection circuit is not limited by the present invention.
- FIG. 1 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to an embodiment of the present invention.
- the LDNMOS devices 10 and 20 for an ESD protection circuit includes a P-type substrate 100 and an N-type deep well region 102 .
- the P-type substrate 100 includes a first area 140 and second areas 150 a and 150 b.
- the first area 140 is disposed between second areas 150 a and 150 b.
- the N-type deep well region 102 is disposed in the first area 140 and the second areas 150 a and 150 b of the substrate 100 .
- the energy of implantation for forming the N-type deep well region 102 is about 1600-2000 KeV, and the dosage of the same is about 10 11 ⁇ 3 ⁇ 10 12 /cm 2 , for example.
- the ESD LDNMOS device 10 further includes a gate electrode 110 a, an N-type first doped region 106 , an N-type grade region 130 , two N-type second doped regions 108 a, a P-type doped region 134 a and a P-type body region 104 a.
- the ESD LDNMOS device 20 further includes a gate electrode 110 b, an N-type first doped region 106 , an N-type grade region 130 , two N-type second doped regions 108 b, a P-type doped region 134 b and a P-type body region 104 b.
- the N-type grade region 130 is disposed in the deep well region 102 of the first area 140 .
- the energy of implantation for forming the N-type grade region 130 is about 50-150 KeV, and the dosage of the same is about 10 11 ⁇ 5 ⁇ 10 12 /cm 2 , for example.
- the N-type first doped region 106 may be an N+ doped region disposed in the grade region 130 of the same conductivity.
- the N-type first doped region 106 is the common drain region of the ESD LDNMOS devices 10 and 20 .
- the N-type first doped region 106 is electronically connected to the pad via a contact plug.
- the energy of implantation for forming the N-type first doped region 106 is about 60-100 KeV, and the dosage of the same is about 10 14 ⁇ 2 ⁇ 10 5 /cm 2 , for example.
- the P-type body regions 104 a and 104 b are respectively disposed in the deep well region 102 of the second areas 150 a and 150 b.
- the energy of implantation for forming the P-type body regions 104 a and 104 b is about 160-200 KeV, and the dosage of the same is about 10 12 ⁇ 4 ⁇ 10 13 /cm 2 , for example.
- the N-type second doped regions 108 a and 108 b are respectively disposed in the P-type body regions 104 a and 104 b.
- the N-type second doped regions 108 a and 108 b are source regions respectively for the ESD LDNMOS devices 10 and 20 .
- the energy of implantation for forming the N-type second doped regions is about 60-100 KeV, and the dosage of the same is about 10 14 ⁇ 2 ⁇ 10 15 /cm 2 , for example.
- the P-type doped regions 134 a and 134 b are respectively disposed in the P-type body regions 104 a and 104 b.
- the P-type doped region 134 a is disposed between the two N-type second doped regions 108 a.
- the P-type doped region 134 b is disposed between the two N-type second doped regions 108 b.
- the energy of implantation for forming the P-type doped regions 134 a and 134 b is about 35-75 KeV, and the dosage of the same is about 10 14 ⁇ 3 ⁇ 10 15 /cm 2 , for example.
- the P-type doped region 134 a and the N-type second doped regions 108 a are electronically connected to the source line via a contact plug.
- the P-type doped region 134 b and the N-type second doped regions 108 b are electronically connected to the source line via a contact plug.
- the gate electrode 110 a is disposed on the deep well region 102 between the first area 140 and the second area 150 a, extending over the N-type grade region 130 of the first area 140 and a portion of the P-type body region 104 a of the second area 150 a.
- the gate electrode 110 b is disposed on the deep well region 102 between the first area 140 and the second area 150 b, extending over the N-type grade region 130 of the first area 140 and a portion of the P-type body region 104 b of the second area 150 b.
- the gate electrodes 110 a and 110 b include a gate conductive layer and a gate dielectric layer. Spacers are formed beside the gate conductive layer and the gate dielectric layer.
- the gate electrodes 110 a and 110 b are connected to each other to form a two-finger shape. It is for sure that the device for an ESD protection circuit can include a plurality of LDNMOS devices, and a plurality of gate electrodes of the LDNMOS devices is connected to one another to form a multi-finger shape, as shown in FIG. 1A .
- the ESD LDNMOS devices 10 and 20 further respectively include N-type lightly doped regions 136 a and 136 b.
- the N-type lightly doped region 136 a is disposed between the gate electrode 110 a and the N-type second doped region 108 a.
- the N-type lightly doped region 136 b is disposed between the gate electrode 110 b and the N-type second doped region 108 b.
- the ESD LDNMOS devices 10 and 20 can further include P-type well regions 116 a and 116 b and guard rings 118 a and 118 b.
- the P-type well regions 116 a and 116 b are respectively disposed outside the N-type deep well region 102 .
- the guard rings 118 a and 118 b are respectively disposed in the P-type well regions 116 a and 116 b.
- an isolation structure 101 a is disposed between the guard ring 118 a and the N-type second doped region 108 a
- an isolation structure 101 b is disposed between the guard ring 118 b and the N-type second doped region 108 b.
- the isolation structures 101 a and 101 b can be shallow trench isolation (STI) structures or a field oxide (FOX) structures.
- the ESD LDNMOS devices 10 and 20 further include a P-type implanted region 132 disposed in the first area 140 of the substrate 100 .
- the dopant of the P-type implanted region 132 includes boron, for example.
- the area of the P-type implanted region 132 is greater than that of the N-type first doped region 106 but less than that of the N-type grade region 130 .
- the P-type implanted region 132 can be integrated with the current CDMOS process; that is, the P-type implanted region 132 can be formed by forming the implantation mask and performing the ion implantation.
- the timing of forming the P-type implanted region 132 is not limited.
- the implantation depth of the P-type implanted region 132 is related to the energy of implantation, and the energy of implantation is between about 10 and 250 KeV.
- the implantation dosage of the N-type implanted region 132 is about 0.5-1.5 times that of the N-type grade region 132 .
- the implantation dosage of the N-type implanted region 132 is about 0.7-1.3 times that of the N-type grade region 132 .
- the implantation dosage of the N-type implanted region 132 is about 0.9-1.1 times that of the N-type grade region 132 .
- the P-type implanted region 132 is disposed between the N-type first doped region 106 and the N-type grade region 130 .
- the energy of implantation for forming the P-type implanted region 132 is about 10-15 KeV, and the dosage of the same is about 2 ⁇ 10 13 ⁇ 8 ⁇ 10 13 /cm 2 , for example.
- the P-type implanted region 132 is disposed in the N-type grade region 130 .
- the energy of implantation for forming the P-type implanted region 132 is about 15-25 KeV, and the dosage of the same is about 2 ⁇ 10 13 ⁇ 8 ⁇ 10 13 /cm 2 , for example.
- the P-type implanted region 132 is disposed between the N-type grade region 130 and the N-type deep well region 102 .
- the energy of implantation for forming the P-type implanted region 132 is about 25-35 KeV, and the dosage of the same is about 2 ⁇ 10 13 ⁇ 8 ⁇ 10 13 /cm 2 , for example.
- the N-type implanted region 132 is disposed in the N-type deep well region 102 .
- the energy of implantation for forming the P-type implanted region 132 is about 100-200 KeV, and the dosage of the same is about 2 ⁇ 10 13 ⁇ 8 ⁇ 10 13 /cm 2 , for example.
- the ESD LDNMOS device 10 of FIG. 4 when the applied ESD voltage is greater than the breakdown voltage of junctions between the N-type deep well region 102 , the P-type body region 104 a and the P-type implanted region 132 , the hole and electron currents are generated through the avalanche breakdown mechanism.
- the hole current flows through the P-type body region 104 a and reaches the P-type doped region 134 a connected to the source line, so that the voltage levels of the P-type body region 104 a and the P-type implanted region 132 are increased.
- the lateral npn bipolar junction transistor (BJT) including the N-type deep well region 102 , the P-type body region 104 a and the N-type second doped region 108 a is triggered on when the voltage drop across the P-type body region 104 a is greater than the cut-in voltage of the lateral npn BJT.
- the hole current is injected to the P-type doped region 134 a via the P-type implanted region 132 , so as to increase the voltage level of the P-type implanted region 132 .
- the vertical npn BJT including the N-type first doped region 106 , the P-type implanted region 132 and the N-type deep well region 102 is turned on.
- the low impedance path including the N-type first doped region 106 , the P-type implanted region 132 , the N-type deep well region 102 and the P-type doped region 134 a is formed to effectively release the ESD current.
- the P-type implanted region 132 disposed between the N-type first doped region 106 and the N-type grade region 130 ( FIG. 1 ), the P-type implanted region 132 disposed in the N-type grade region 130 ( FIG. 2 ), or the P-type implanted region 132 disposed between the N-type grade region 130 and the N-type deep well region 102 ( FIG. 3 ) forms a vertical npn BJT with the N-type first doped region 106 and the N-type deep well region 102 .
- the vertical npn BJT forms a low impedance path for effectively releasing the ESD current with the lateral npn BJT including the N-type deep well region 102 , the P-type body region 104 a and the N-type second doped region 108 a.
- a single P-type implanted region 132 disposed right below the N-type first doped region 106 is provided for illustration purposes and is not to be construed as limiting the present invention. It is appreciated by persons skilled in the art that the P-type implanted region 132 can include a plurality of separate small regions. For example, the P-type implanted region 132 may include a plurality of small regions disposed parallel to the surface of the substrate, or disposed in the vertical arrangement. The P-type implanted region 132 can also be optionally disposed in two, three or all of the four regions shown in FIGS. 1 to 4 at the same time.
- the P-type implanted region 132 is not limited to be disposed right below the N-type first doped region 106 .
- the P-type implanted region 132 can be slightly shifted from right below the N-type first doped region 106 and close to the gate electrodes 110 a and 110 b.
- the dopant concentration of the P-type implanted region 132 is not limited to be a uniform distribution; that is, a gradient distribution is allowable.
- the example is a 18V ESD LDNMOS device of the present invention.
- FIG. 5 illustrates the electrical relation diagram upon measurement before the ESD LDNMOS device of the example is packaged.
- Table 1 and Table 2 are respectively the testing results of the HBM and MM tests after the ESD LDNMOS device of the example and the conventional device are packaged.
- the ESD LDNMOS device of the example can sustain the current of more than 8 A, and the trigger voltage thereof is about 23 V.
- the testing results of the HBM test of the example is greater than 8.0 KV, and those of the MM test is greater than 800 V.
- an implanted region having a different conductivity from the drain region is disposed below the drain region, so that the ESD protection ability is enhanced, and the ESD tolerance request for commercially available ICs to pass the HBM test at 2 kV and the MM test at 200 V is easily achieved.
- the ESD LDMOS device of the present invention can be applicable to all power management ICs.
- the process is simple and can be integrated with the current CDMOS process.
- the ESD LDMOS device of the present invention is very competitive because the fabrication cost is low.
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Abstract
Description
- 1. Field of Invention
- The present invention relates to a semiconductor device, and more particularly to a lateral diffused metal oxide semiconductor (LDMOS) device for an electrostatic discharge (ESD) protection circuit.
- 2. Description of Related Art
- ESD is the main factor of electrical overstress (EOS) which causes damage to most of electronic devices or systems. Such damage can result in the permanent damage of semiconductor devices and computer systems, so that the circuit function of ICs is affected and the operation of electronic products is abnormal.
- In a deep submicron semiconductor process, the ESD tolerance is getting worse as dimensions of devices are getting smaller. Hence, the design for ESD protection has been taken into account when designing ICs. Usually the ESD tolerance for commercially available ICs is required to pass the human body mode (HBM) test at 2 kV and the machine model (MM) test at 200 V.
- In order to sustain the above-mentioned high-voltage ESD tests, the large-sized ESD protection device for ICs is usually applied. This large-sized device is designed as a multi-finger shape in the layout to save the chip area as much as possible.
- However, for the frequently used LDMOS device in power management, at the moment, the multi-finger LDMOS device still cannot pass the HBM test at 2 kV and the MM test at 200 V. Therefore, a LDMOS device having enough ESD tolerance is deeply desired for an ESD protection circuit.
- The present invention provides a LDMOS device having a higher ESD tolerance.
- The present invention provides a device for an ESD protection circuit, and the device includes at least one LDMOS device. The LDMOS device includes a substrate of a first conductivity type and a deep well region of a second conductivity type. The substrate includes a first area and a second area. The deep well region is disposed in the first and second areas of the substrate. The LDMOS device further includes a gate electrode, an implanted region of the first conductivity type, a grade region of the second conductivity type, a first doped region of the second conductivity type, a body region of the first conductivity type, a second doped region of the second conductivity type, and a doped region of the first conductivity type. The gate electrode is disposed on the substrate between the first and second areas. The implanted region is disposed in the first area of the substrate. The grade region is disposed in the deep well region of the first area. The first doped region is disposed in the grade region. The body region is disposed in the deep well region of the second area. The second doped region is disposed in the body region. The doped region is disposed in the body region and adjacent to the second doped region.
- According to an embodiment of the present invention, the implanted region is disposed between the first doped region and the grade region.
- According to an embodiment of the present invention, the implanted region is disposed below the first doped region.
- According to an embodiment of the present invention, the implanted region is disposed in the grade region.
- According to an embodiment of the present invention, the implanted region is disposed between the grade region and the deep well region.
- According to an embodiment of the present invention, the implanted region is disposed in the deep well region.
- According to an embodiment of the present invention, the first conductivity type is P-type and the second conductivity is N-type.
- According to an embodiment of the present invention, the first conductivity type is N-type and the second conductivity is P-type.
- According to an embodiment of the present invention, the LDMOS device further includes a lightly doped region of the second conductivity type. The lightly doped region is disposed in the body region between the gate electrode and the second doped region.
- According to an embodiment of the present invention, the LDMOS device further includes a well region of the first conductivity type and a guard ring. The well region is disposed outside the deep well region. The guard ring is disposed in the well region.
- According to an embodiment of the present invention, the LDMOS device further includes an isolation structure. The isolation structure is disposed between the second doped region and the guard ring.
- According to an embodiment of the present invention, the isolation structure includes a FOX structure or a STI structure.
- According to an embodiment of the present invention, the device for an ESD protection circuit includes a plurality of the LDMOS devices.
- According to an embodiment of the present invention, a plurality of the gate electrodes of the LDMOS devices is connected to each other.
- According to an embodiment of the present invention, the gate electrodes are connected to form a multi-finger shape.
- In the LDMOS device for an ESD protection circuit of the present invention, an implanted region is formed below the drain region, so that the ESD tolerance is significantly enhanced.
- In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, a preferred embodiment accompanied with figures is described in detail below.
-
FIG. 1 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to an embodiment of the present invention. -
FIG. 1A schematically illustrates a top view of a LDNMOS device for an ESD protection circuit according to an embodiment of the present invention. -
FIG. 2 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to another embodiment of the present invention. -
FIG. 3 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to yet another embodiment of the present invention. -
FIG. 4 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to still another embodiment of the present invention. -
FIG. 5 illustrates the electrical relation diagram upon measurement before the ESD LDNMOS device of the example is packaged. - In the present invention, a LDMOS device for an ESD protection circuit can be a LDNMOS device or a LDPMOS device. In the following embodiments, a LDNMOS device in which the first conductivity type is P-type and the second conductivity type is N-type is provided for illustration purposes, and is not to be construed as limiting the scope of the present invention. It is appreciated by persons skilled in the art that the first conductivity type can be N-type and the second conductivity type can be P-type so as to form a LDPMOS device.
- A device for an ESD protection circuit including two LDNMOS devices is provided for illustration purposes, and is not to be construed as limiting the present invention. The number of the LDMOS devices for the ESD protection circuit is not limited by the present invention.
-
FIG. 1 schematically illustrates a cross-section view of a LDNMOS device for an ESD protection circuit according to an embodiment of the present invention. - Referring to
FIG. 1 , the LDNMOSdevices ESD LDNMOS devices 10 and 20) includes a P-type substrate 100 and an N-typedeep well region 102. The P-type substrate 100 includes afirst area 140 andsecond areas first area 140 is disposed betweensecond areas deep well region 102 is disposed in thefirst area 140 and thesecond areas substrate 100. In an embodiment, the energy of implantation for forming the N-typedeep well region 102 is about 1600-2000 KeV, and the dosage of the same is about 1011−3×1012/cm2, for example. - The
ESD LDNMOS device 10 further includes agate electrode 110 a, an N-type first dopedregion 106, an N-type grade region 130, two N-type second dopedregions 108 a, a P-type dopedregion 134 a and a P-type body region 104 a. TheESD LDNMOS device 20 further includes agate electrode 110 b, an N-type first dopedregion 106, an N-type grade region 130, two N-type second dopedregions 108 b, a P-type dopedregion 134 b and a P-type body region 104 b. - The N-
type grade region 130 is disposed in thedeep well region 102 of thefirst area 140. In an embodiment, the energy of implantation for forming the N-type grade region 130 is about 50-150 KeV, and the dosage of the same is about 1011−5×1012/cm2, for example. - The N-type first doped
region 106 may be an N+ doped region disposed in thegrade region 130 of the same conductivity. The N-type first dopedregion 106 is the common drain region of theESD LDNMOS devices region 106 is electronically connected to the pad via a contact plug. In an embodiment, the energy of implantation for forming the N-type first dopedregion 106 is about 60-100 KeV, and the dosage of the same is about 1014−2×105/cm2, for example. - The P-
type body regions deep well region 102 of thesecond areas type body regions - The N-type second doped
regions type body regions regions ESD LDNMOS devices - The P-type doped
regions type body regions region 134 a is disposed between the two N-type second dopedregions 108 a. The P-type dopedregion 134 b is disposed between the two N-type second dopedregions 108 b. In an embodiment, the energy of implantation for forming the P-type dopedregions region 134 a and the N-type second dopedregions 108 a are electronically connected to the source line via a contact plug. Similarly, the P-type dopedregion 134 b and the N-type second dopedregions 108 b are electronically connected to the source line via a contact plug. - The
gate electrode 110 a is disposed on thedeep well region 102 between thefirst area 140 and thesecond area 150 a, extending over the N-type grade region 130 of thefirst area 140 and a portion of the P-type body region 104 a of thesecond area 150 a. Thegate electrode 110 b is disposed on thedeep well region 102 between thefirst area 140 and thesecond area 150 b, extending over the N-type grade region 130 of thefirst area 140 and a portion of the P-type body region 104 b of thesecond area 150 b. Thegate electrodes gate electrodes FIG. 1A . - In an embodiment, the
ESD LDNMOS devices regions region 136 a is disposed between thegate electrode 110 a and the N-type second dopedregion 108 a. The N-type lightly dopedregion 136 b is disposed between thegate electrode 110 b and the N-type second dopedregion 108 b. - The
ESD LDNMOS devices type well regions guard rings 118 a and 118 b. The P-type well regions deep well region 102. The guard rings 118 a and 118 b are respectively disposed in the P-type well regions isolation structure 101 a is disposed between theguard ring 118 a and the N-type second dopedregion 108 a, and an isolation structure 101 b is disposed between the guard ring 118 b and the N-type second dopedregion 108 b. Theisolation structures 101 a and 101 b can be shallow trench isolation (STI) structures or a field oxide (FOX) structures. - In this invention, it is noted that the
ESD LDNMOS devices region 132 disposed in thefirst area 140 of thesubstrate 100. The dopant of the P-type implantedregion 132 includes boron, for example. The area of the P-type implantedregion 132 is greater than that of the N-type first dopedregion 106 but less than that of the N-type grade region 130. The P-type implantedregion 132 can be integrated with the current CDMOS process; that is, the P-type implantedregion 132 can be formed by forming the implantation mask and performing the ion implantation. The timing of forming the P-type implantedregion 132 is not limited. The implantation depth of the P-type implantedregion 132 is related to the energy of implantation, and the energy of implantation is between about 10 and 250 KeV. In an embodiment, the implantation dosage of the N-type implantedregion 132 is about 0.5-1.5 times that of the N-type grade region 132. In another embodiment, the implantation dosage of the N-type implantedregion 132 is about 0.7-1.3 times that of the N-type grade region 132. In yet another embodiment, the implantation dosage of the N-type implantedregion 132 is about 0.9-1.1 times that of the N-type grade region 132. - Referring to
FIG. 1 , in an embodiment, the P-type implantedregion 132 is disposed between the N-type first dopedregion 106 and the N-type grade region 130. The energy of implantation for forming the P-type implantedregion 132 is about 10-15 KeV, and the dosage of the same is about 2×1013−8×1013/cm2, for example. - Referring to
FIG. 2 , in another embodiment, the P-type implantedregion 132 is disposed in the N-type grade region 130. The energy of implantation for forming the P-type implantedregion 132 is about 15-25 KeV, and the dosage of the same is about 2×1013−8×1013/cm2, for example. - Referring to
FIG. 3 , in yet another embodiment, the P-type implantedregion 132 is disposed between the N-type grade region 130 and the N-typedeep well region 102. The energy of implantation for forming the P-type implantedregion 132 is about 25-35 KeV, and the dosage of the same is about 2×1013−8×1013/cm2, for example. - Referring to
FIG. 4 , in still another embodiment, the N-type implantedregion 132 is disposed in the N-typedeep well region 102. The energy of implantation for forming the P-type implantedregion 132 is about 100-200 KeV, and the dosage of the same is about 2×1013−8×1013/cm2, for example. - In the
ESD LDNMOS device 10 ofFIG. 4 , when the applied ESD voltage is greater than the breakdown voltage of junctions between the N-typedeep well region 102, the P-type body region 104 a and the P-type implantedregion 132, the hole and electron currents are generated through the avalanche breakdown mechanism. The hole current flows through the P-type body region 104 a and reaches the P-type dopedregion 134 a connected to the source line, so that the voltage levels of the P-type body region 104 a and the P-type implantedregion 132 are increased. In details, the lateral npn bipolar junction transistor (BJT) including the N-typedeep well region 102, the P-type body region 104 a and the N-type second dopedregion 108 a is triggered on when the voltage drop across the P-type body region 104 a is greater than the cut-in voltage of the lateral npn BJT. When the lateral npn BJT is turned on, the hole current is injected to the P-type dopedregion 134 a via the P-type implantedregion 132, so as to increase the voltage level of the P-type implantedregion 132. Thereafter, when the injected hole current is greater than a critical value, the vertical npn BJT including the N-type first dopedregion 106, the P-type implantedregion 132 and the N-typedeep well region 102 is turned on. Once the lateral npn BJT and the vertical npn BJT are turned on simultaneously, the low impedance path including the N-type first dopedregion 106, the P-type implantedregion 132, the N-typedeep well region 102 and the P-type dopedregion 134 a is formed to effectively release the ESD current. - Similarly, referring to
FIGS. 1 to 3 , the P-type implantedregion 132 disposed between the N-type first dopedregion 106 and the N-type grade region 130 (FIG. 1 ), the P-type implantedregion 132 disposed in the N-type grade region 130 (FIG. 2 ), or the P-type implantedregion 132 disposed between the N-type grade region 130 and the N-type deep well region 102 (FIG. 3 ) forms a vertical npn BJT with the N-type first dopedregion 106 and the N-typedeep well region 102. Further, the vertical npn BJT forms a low impedance path for effectively releasing the ESD current with the lateral npn BJT including the N-typedeep well region 102, the P-type body region 104 a and the N-type second dopedregion 108 a. - In the above-mentioned embodiments, a single P-type implanted
region 132 disposed right below the N-type first dopedregion 106 is provided for illustration purposes and is not to be construed as limiting the present invention. It is appreciated by persons skilled in the art that the P-type implantedregion 132 can include a plurality of separate small regions. For example, the P-type implantedregion 132 may include a plurality of small regions disposed parallel to the surface of the substrate, or disposed in the vertical arrangement. The P-type implantedregion 132 can also be optionally disposed in two, three or all of the four regions shown inFIGS. 1 to 4 at the same time. - The P-type implanted
region 132 is not limited to be disposed right below the N-type first dopedregion 106. In other words, the P-type implantedregion 132 can be slightly shifted from right below the N-type first dopedregion 106 and close to thegate electrodes region 132 is not limited to be a uniform distribution; that is, a gradient distribution is allowable. - The example is a 18V ESD LDNMOS device of the present invention.
FIG. 5 illustrates the electrical relation diagram upon measurement before the ESD LDNMOS device of the example is packaged. Table 1 and Table 2 are respectively the testing results of the HBM and MM tests after the ESD LDNMOS device of the example and the conventional device are packaged. -
TABLE 1 HBM test (KV) HBM Reverse test Chip Chip Forward (KV) 1 Chip 2Chip 3Chip 45 Chip 6Conventional 1 1 1.2 1.8 1.8 1.8 >−8 device Example >8 >8 >8 >8 >8 >8 >−8 -
TABLE 2 MM test (KV) MM Reverse Forward test Chip Chip (V) 1 Chip 2Chip 3Chip 45 Chip 6Conventional 125 200 150 125 −275 −825 −750 device Example >800 >800 >800 >800 −750 −750 −800 - Referring to
FIG. 5 , the ESD LDNMOS device of the example can sustain the current of more than 8 A, and the trigger voltage thereof is about 23 V. - Referring to Tables 1 and 2, the testing results of the HBM test of the example is greater than 8.0 KV, and those of the MM test is greater than 800 V.
- In summary, in the ESD LDMOS device of the present invention, an implanted region having a different conductivity from the drain region is disposed below the drain region, so that the ESD protection ability is enhanced, and the ESD tolerance request for commercially available ICs to pass the HBM test at 2 kV and the MM test at 200 V is easily achieved.
- Further, the ESD LDMOS device of the present invention can be applicable to all power management ICs. The process is simple and can be integrated with the current CDMOS process. In addition, the ESD LDMOS device of the present invention is very competitive because the fabrication cost is low.
- This invention has been disclosed above in the preferred embodiments, but is not limited to those. It is known to persons skilled in the art that some modifications and innovations may be made without departing from the spirit and scope of this invention. Hence, the scope of this invention should be defined by the following claims.
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