WO2005057661A1 - 半導体素子とその製造方法 - Google Patents
半導体素子とその製造方法 Download PDFInfo
- Publication number
- WO2005057661A1 WO2005057661A1 PCT/JP2004/018383 JP2004018383W WO2005057661A1 WO 2005057661 A1 WO2005057661 A1 WO 2005057661A1 JP 2004018383 W JP2004018383 W JP 2004018383W WO 2005057661 A1 WO2005057661 A1 WO 2005057661A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- region
- semiconductor region
- semiconductor
- current
- emitter
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 206
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 230000001629 suppression Effects 0.000 claims abstract description 35
- 239000012535 impurity Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 18
- 239000012212 insulator Substances 0.000 claims description 10
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 2
- 230000003321 amplification Effects 0.000 description 18
- 238000003199 nucleic acid amplification method Methods 0.000 description 18
- 239000000758 substrate Substances 0.000 description 14
- 238000002955 isolation Methods 0.000 description 11
- 230000007423 decrease Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000005468 ion implantation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/73—Bipolar junction transistors
- H01L29/735—Lateral transistors
-
- 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
- H01L29/0692—Surface layout
-
- 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
- H01L29/10—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 not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1004—Base region of bipolar transistors
- H01L29/1008—Base region of bipolar transistors of lateral transistors
Definitions
- the present invention relates to a semiconductor device, and more particularly, to a semiconductor device having a lateral structure and a method for manufacturing the same.
- a lateral PNP transistor having a configuration in which an emitter region, a collector region, and a base region are formed adjacent to each other in a horizontal direction is used.
- the semiconductor element used in the lateral PNP transistor includes, for example, an N- type base region, a P + type emitter region formed in the surface region of the base region, and a surface region of the base region separated from the emitter region.
- a P + type collector region formed at a position opposite to the emitter region across the collector region, an N + type base contact region formed at a distance from the emitter region, and a surface region of the base region.
- a P + type isolation region for electrically separating the elements.
- Patent Document 1 proposes a lateral PNP transistor having a structure in which the emitter region is surrounded by a collector region.
- the collector region of the lateral PNP transistor has a structure that is separated from the emitter region and surrounds the emitter region, so that most of the current flowing through the emitter region flows into the collector region 44 . As a result, it is possible to prevent generation of a leak current during the operation of the transistor.
- a lateral PNP transistor having such an element structure includes a transistor on the side surface of the emitter region and a transistor on the bottom surface of the emitter region. Since the bottom-side transistor has a larger base width than the side-side transistor, the current gain of the bottom-side transistor is generally much lower than that of the side-side transistor. The current amplification factor of the transistor at the bottom is lower than that at the side, so the current amplification of the lateral PNP transistor as a whole is lower. This is because, for example, the current amplification factor of the transistor on the side portion is set to 100, and the current amplification factor of the transistor on the bottom portion is set to 10.
- the current is 1Z2 because the transistors are in parallel, so the current gain of the transistor on the side is 50 and the current gain of the transistor on the bottom is 5. Therefore, the current gain of the lateral PNP transistor as a whole is 55. In this way, the presence of a transistor with a long base width V and a bottom portion lowers the current amplification factor of the lateral PNP transistor as a whole.
- Patent Document 1 JP-A-10-270458
- the present invention has been made in view of the above situation, and has as its object to provide a semiconductor element capable of improving a current amplification factor.
- Another object of the present invention is to provide a semiconductor device capable of suppressing a current flowing through a bottom surface force collector region of an emitter region.
- Another object of the present invention is to provide a semiconductor device in which the current amplification factor is unlikely to decrease even when the ratio of the emitter area to the emitter length is large!
- a semiconductor device comprises:
- a second conductivity type second semiconductor region formed in a surface region of the first semiconductor region;
- a third semiconductor region of a second conductivity type formed in the surface region of the first semiconductor region so as to be separated from the second semiconductor region;
- the third semiconductor region is formed between the first semiconductor region and the second semiconductor region so as to cover at least a bottom surface of the second semiconductor region, and the third semiconductor region extends from the bottom surface of the second semiconductor region via the first semiconductor region.
- a current suppression region for suppressing a current flowing through the region is formed between the first semiconductor region and the second semiconductor region so as to cover at least a bottom surface of the second semiconductor region, and the third semiconductor region extends from the bottom surface of the second semiconductor region via the first semiconductor region.
- the current suppression region may be a semiconductor region of the first conductivity type having a higher impurity concentration than the first semiconductor region.
- the current suppression region may be an insulator
- the insulator in the current suppression region may be SiO.
- the third semiconductor region may be ring-shaped, and may be formed to surround the second semiconductor region.
- a semiconductor device includes:
- a second semiconductor region of a second conductivity type formed in a surface region of the first semiconductor region; and a surface region of the first semiconductor region spaced apart from the second semiconductor region and surrounding the second semiconductor region.
- the third semiconductor region is formed between the first semiconductor region and the second semiconductor region so as to cover a bottom surface of the second semiconductor region, and the third semiconductor region extends from the bottom surface of the second semiconductor region via the first semiconductor region.
- a current suppression region for suppressing a current flowing through the region is formed between the first semiconductor region and the second semiconductor region so as to cover a bottom surface of the second semiconductor region, and the third semiconductor region extends from the bottom surface of the second semiconductor region via the first semiconductor region.
- the current suppression region may be a semiconductor region of a first conductivity type having a higher impurity concentration than the first semiconductor region.
- the current suppressing region may be an insulator.
- the insulator in the current suppression region may be SiO.
- the third semiconductor region may have a ring shape and may be formed to surround the second semiconductor region.
- the semiconductor device includes: A first semiconductor region of a first conductivity type
- a second conductivity type second semiconductor region formed in a surface region of the first semiconductor region; and a second conductivity type second semiconductor region formed in the surface region of the first semiconductor region so as to be separated from the second semiconductor region.
- a fourth semiconductor region of a first conductivity type formed in a surface region of the first semiconductor region so as to be spaced and opposed to the third semiconductor region;
- a fifth semiconductor region of a second conductivity type formed in a surface region of the first semiconductor region and separating semiconductor elements
- the third semiconductor region is formed between the first semiconductor region and the second semiconductor region so as to cover at least a bottom surface of the second semiconductor region, and the third semiconductor region extends from the bottom surface of the second semiconductor region via the first semiconductor region.
- Current suppression region for suppressing the current flowing through the region is formed between the first semiconductor region and the second semiconductor region so as to cover at least a bottom surface of the second semiconductor region, and the third semiconductor region extends from the bottom surface of the second semiconductor region via the first semiconductor region.
- a method for manufacturing a semiconductor device includes:
- a method for manufacturing a semiconductor device A method for manufacturing a semiconductor device
- the current suppression region may be formed by diffusing a first conductivity type impurity so as to have a higher impurity concentration than the first semiconductor region.
- the current suppression region may be formed by an insulator.
- the current suppression region may be formed by ion implantation of oxygen atoms.
- the third semiconductor region may be formed in a ring shape so as to surround the second semiconductor region.
- the present invention has been made in view of the above situation, and it is possible to improve the current amplification factor. It is possible to provide a semiconductor device that can be used.
- the present invention can provide a semiconductor device capable of suppressing a current flowing through a bottom surface force collector region of an emitter region.
- the present invention can provide a semiconductor device in which the current amplification factor is unlikely to decrease even when the ratio of the emitter area to the emitter peripheral length increases.
- FIG. 1 is a cross-sectional view of a semiconductor device according to the present embodiment.
- FIG. 2 is a plan view of a semiconductor device according to an embodiment of the present invention.
- FIG. 3 is a diagram showing an equivalent circuit of a lateral PNP transistor when a current suppression region is provided.
- FIG. 4 is a view for explaining the method for manufacturing the semiconductor device of the present embodiment.
- FIG. 5 is a view for explaining the method for manufacturing the semiconductor device of the present embodiment.
- FIG. 1 and FIG. 2 show the configuration of the semiconductor element 1 according to the present embodiment.
- FIG. 2 is a plan view of the semiconductor device 1
- FIG. 1 is a cross-sectional view taken along a dashed-dotted line AA 'of FIG.
- the semiconductor device 1 includes a semiconductor substrate 11, a collector electrode 21, an emitter electrode 22, and a base electrode 23, as shown in FIGS. In FIG. 2, each electrode (collector electrode 21, emitter electrode 22, base electrode 23) and the like are omitted.
- the semiconductor substrate 11 includes a P-type semiconductor substrate 12 and a semiconductor layer 20 formed on the P-type semiconductor substrate 12.
- the P-type semiconductor substrate 12 is formed by diffusing a P-type impurity (for example, boron) into a silicon single crystal substrate.
- a P-type impurity for example, boron
- the semiconductor layer 20 is formed by, for example, epitaxially growing an N-type semiconductor layer on the P-type semiconductor substrate 12.
- the semiconductor layer 20 has a base region 13, an emitter region 14, a collector region 15, a base contact region 16, a current suppression region 17, and an isolation (isolation) region 18.
- the base region 13 is an island-shaped region of the semiconductor layer 20 divided by the isolation region 18.
- the emitter region 14 is composed of a semiconductor region having P-type conductivity, and is formed in the surface region of the base region 13.
- Collector region 15 is formed of a semiconductor region having P-type conductivity, and is formed in the surface region of base region 13.
- the collector region 15 is formed, for example, in a ring shape so as to be spaced from the emitter region 14 and surround the emitter region 14.
- the base contact region 16 is composed of a semiconductor region having N-type conductivity, and is formed in the surface region of the base region 13.
- Base contact region 16 has a higher impurity concentration than base region 13, and is formed at a position facing emitter region 14 with collector region 15 interposed therebetween and spaced apart from emitter region 14.
- the current suppression region 17 is formed below the emitter region 14 so as to cover the bottom surface of the emitter region 14.
- the current suppression region 17 has a function of suppressing the bottom surface force of the emitter region 14 and the current flowing toward the collector region 15.
- the current suppression region 1 7 is composed of a semiconductor region having N-type conductivity and has a higher impurity concentration than the base region 13.
- the bottom portion of the emitter region 14 intersecting with the current suppression region 17 has an increased concentration and a forward voltage. Therefore, the bottom surface force of the emitter region 14 can also suppress the current flowing toward the collector region 15.
- the isolation region 18 is formed on the P-type semiconductor substrate 12 so as to surround the base region 13, and is formed of a semiconductor region having P-type conductivity.
- the isolation region 18 is maintained at a constant potential and functions as a region for electrically separating a plurality of elements.
- the insulating film 19 also has a force such as a silicon oxide film, and is disposed on a predetermined region of the semiconductor layer 20.
- the insulating film 19 covers one main surface of the semiconductor substrate 11, and has a contact hole 191 at a position corresponding to the collector electrode 21, the emitter electrode 22, and the base electrode 23.
- the collector region 15, the emitter region 14, and the base contact region 16 are electrically connected to the respective electrodes via the contact holes 191.
- the collector electrode 21 is formed on the collector region 15 and is electrically connected to the collector region 15 via a contact hole 191.
- the emitter electrode 22 is formed on the emitter region 14 and is electrically connected to the emitter region 14 via a contact hole 191.
- Base electrode 23 is formed on base contact region 16 and is electrically connected to base contact region 16 via contact hole 191.
- the collector electrode 21, the emitter electrode 22, and the base electrode 23 are each made of a metal such as aluminum, copper, and nickel.
- FIG. 3 shows an equivalent circuit of a lateral PNP transistor provided with the current suppression region 17. The two transistors in FIG.
- the current flows to the lateral PNP transistor on the side part having a low forward voltage, and hardly flows to the lateral PNP transistor on the bottom part. This is because the forward voltage of the lateral PNP transistor at the bottom becomes higher than the forward voltage of the lateral PNP transistor at the side due to the current suppression region 17. As a result, no current flows through the lateral PNP transistor on the bottom portion having a large base width, and the current amplification factor of the lateral PNP transistor is improved. For example, if the current gain of the side portion is 100 and the current gain of the bottom portion is 10, the current gain of the lateral PNP transistor can be maintained at almost 100.
- a P-type impurity is diffused and introduced into a silicon single crystal substrate to form a P-type semiconductor substrate 12.
- a semiconductor layer 20 is formed on one main surface of the P-type semiconductor substrate 12 by using, for example, an epitaxial growth method.
- a resist film (not shown) is formed on one surface of the semiconductor layer 20, and a portion of the formed resist film corresponding to a region where the isolation region 18 is to be formed is selectively etched to form a window. I do.
- a P-type impurity for example, boron
- boron is ion-implanted to a predetermined depth to form an isolation region 18 as shown in FIG.
- an inner island region divided by the isolation region 18 becomes the base region 13.
- a P-type impurity for example, boron
- boron a P-type impurity
- a collector region 15 are formed. Note that the emitter region 14 and the collector region 15 may be formed separately.
- an N-type impurity for example, phosphorus
- an N-type impurity for example, phosphorus
- an N-type impurity eg, phosphorus
- an N-type impurity is selectively ion-implanted to a predetermined depth through the emitter region 14 into the region where the current suppression region 17 is to be formed, as shown in FIG. As shown in FIG. 7, a current suppression region 17 is formed.
- contact holes 191 for emitters, bases, and collectors are formed in predetermined regions on the insulating film 19.
- a metal (aluminum, copper, nickel, etc.) is vacuum-deposited on insulating film 19. Then, the deposited metal is selectively patterned to form a collector electrode 21 contacting the collector region 15 via the contact hole 191 and an emitter electrode 22 contacting the emitter region 14 via the contact hole 191. Then, a base electrode 23 which is in contact with the base contact region 16 via the contact hole 191 is formed.
- the semiconductor element 1 of the present embodiment as shown in FIG. 1 is formed.
- base region 13 has a relatively constant impurity concentration distribution.
- the ion implantation method is used for forming the current suppression region 17, the depth can be easily controlled, and the current suppression region 17 having a desired depth can be obtained.
- the present invention has been described by taking as an example the case where an N-type conductive semiconductor region having a higher impurity concentration than the base region 13 is used as the current suppression region 17.
- Any material may be used as long as it can suppress the current flowing toward the collector region 15 from the bottom surface of the emitter region 14, and may be formed of, for example, an insulator.
- oxygen is ion-implanted from the upper surface of the emitter region to form an insulating film made of SiO on the lower surface of the emitter region 14.
- the present invention has been described by exemplifying a case where the current suppressing region 17 is formed by an ion implantation method.
- the current suppressing region 17 may be formed by a thermal diffusion method.
- the present invention has been described by taking as an example a case where collector region 15 is formed in a ring shape so as to be spaced apart from emitter region 14 and to surround emitter region 14. As long as it is formed apart from the power emitter region 14, it need not be formed in a ring shape so as to surround the emitter region 14. For example, it may be a case in which it is formed so as to be separated from the emitter region 14. Also in this case, if the current suppression region 17 is formed so as to cover at least the bottom surface of the emitter region 14, the bottom surface force of the emitter region 14 can also suppress the current flowing toward the collector region 15, thereby improving the current amplification factor. Can be done.
- the semiconductor element 1 of the present invention has been described by taking the case of a PNP transistor as an example.
- the semiconductor element 1 can be formed to be used for an NPN transistor.
- the method for manufacturing the semiconductor device 1 of the present invention is not limited to the method described in the above embodiment, and the order of the steps can be changed or another step can be used as necessary.
- the case where the semiconductor layer 20 is formed by an epitaxy growth method has been described as an example.
- the present invention is not limited to this. It is also possible to form the layer 20.
- the present invention it is possible to provide a semiconductor element in which the current amplification factor is unlikely to decrease even when the ratio of the emitter area to the emitter peripheral length increases.
- the present invention can be used for a semiconductor device having a lateral structure used for an analog integrated circuit.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Bipolar Transistors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-415523 | 2003-12-12 | ||
JP2003415523A JP2005175318A (ja) | 2003-12-12 | 2003-12-12 | 半導体素子 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005057661A1 true WO2005057661A1 (ja) | 2005-06-23 |
Family
ID=34675134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/018383 WO2005057661A1 (ja) | 2003-12-12 | 2004-12-09 | 半導体素子とその製造方法 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2005175318A (ja) |
TW (1) | TWI270144B (ja) |
WO (1) | WO2005057661A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01305565A (ja) * | 1988-06-03 | 1989-12-08 | Hitachi Ltd | トランジスタ |
JPH025429A (ja) * | 1988-06-22 | 1990-01-10 | Nec Corp | 横型pnpトランジスタの製造方法 |
JPH038342A (ja) * | 1989-06-06 | 1991-01-16 | Toshiba Corp | 半導体集積回路 |
JPH04162568A (ja) * | 1990-10-25 | 1992-06-08 | Iwatsu Electric Co Ltd | 横方向バイポーラトランジスタ及びその製造方法 |
JPH04364736A (ja) * | 1991-06-12 | 1992-12-17 | Hitachi Ltd | 半導体集積回路装置 |
-
2003
- 2003-12-12 JP JP2003415523A patent/JP2005175318A/ja active Pending
-
2004
- 2004-12-09 WO PCT/JP2004/018383 patent/WO2005057661A1/ja active Application Filing
- 2004-12-10 TW TW93138446A patent/TWI270144B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01305565A (ja) * | 1988-06-03 | 1989-12-08 | Hitachi Ltd | トランジスタ |
JPH025429A (ja) * | 1988-06-22 | 1990-01-10 | Nec Corp | 横型pnpトランジスタの製造方法 |
JPH038342A (ja) * | 1989-06-06 | 1991-01-16 | Toshiba Corp | 半導体集積回路 |
JPH04162568A (ja) * | 1990-10-25 | 1992-06-08 | Iwatsu Electric Co Ltd | 横方向バイポーラトランジスタ及びその製造方法 |
JPH04364736A (ja) * | 1991-06-12 | 1992-12-17 | Hitachi Ltd | 半導体集積回路装置 |
Also Published As
Publication number | Publication date |
---|---|
TW200527545A (en) | 2005-08-16 |
JP2005175318A (ja) | 2005-06-30 |
TWI270144B (en) | 2007-01-01 |
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