CN114220846A - 一种ldmosfet、制备方法及芯片和电路 - Google Patents

一种ldmosfet、制备方法及芯片和电路 Download PDF

Info

Publication number
CN114220846A
CN114220846A CN202210159448.2A CN202210159448A CN114220846A CN 114220846 A CN114220846 A CN 114220846A CN 202210159448 A CN202210159448 A CN 202210159448A CN 114220846 A CN114220846 A CN 114220846A
Authority
CN
China
Prior art keywords
type
ldmosfet
depth
body region
type body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210159448.2A
Other languages
English (en)
Inventor
余山
赵东艳
王于波
陈燕宁
付振
刘芳
王凯
吴波
邓永峰
刘倩倩
郁文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Smartchip Microelectronics Technology Co Ltd
Beijing Core Kejian Technology Co Ltd
Original Assignee
Beijing Smartchip Microelectronics Technology Co Ltd
Beijing Core Kejian Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Smartchip Microelectronics Technology Co Ltd, Beijing Core Kejian Technology Co Ltd filed Critical Beijing Smartchip Microelectronics Technology Co Ltd
Priority to CN202210159448.2A priority Critical patent/CN114220846A/zh
Publication of CN114220846A publication Critical patent/CN114220846A/zh
Pending legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor 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
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types 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
    • H01L29/76Unipolar devices, e.g. field effect transistors
    • H01L29/772Field effect transistors
    • H01L29/78Field effect transistors with field effect produced by an insulated gate
    • H01L29/7801DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
    • H01L29/7816Lateral DMOS transistors, i.e. LDMOS transistors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor 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
    • H01L29/02Semiconductor bodies ; Multistep manufacturing processes therefor
    • H01L29/06Semiconductor 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
    • H01L29/0603Semiconductor 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
    • H01L29/0607Semiconductor 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
    • H01L29/0611Semiconductor 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
    • H01L29/0615Semiconductor 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]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor 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
    • H01L29/02Semiconductor bodies ; Multistep manufacturing processes therefor
    • H01L29/06Semiconductor 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
    • H01L29/0684Semiconductor 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor 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
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/66007Multistep manufacturing processes
    • H01L29/66075Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
    • H01L29/66227Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
    • H01L29/66409Unipolar field-effect transistors
    • H01L29/66477Unipolar field-effect transistors with an insulated gate, i.e. MISFET
    • H01L29/66674DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
    • H01L29/66681Lateral DMOS transistors, i.e. LDMOS transistors

Landscapes

  • 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)
  • Manufacturing & Machinery (AREA)
  • Insulated Gate Type Field-Effect Transistor (AREA)

Abstract

本发明实施例提供一种LDMOSFET、制备方法及芯片和电路,所述LDMOSFET包括:衬底,所述衬底上设有埋层;所述埋层上方设有外延层;所述外延层上方设有N型阱;所述N型阱上方依次设有第一P型体区、N型漂移区和第二P型体区;所述N型漂移区的中间设有间隙,所述间隙的深度小于所述N型漂移区的深度。所述LDMOSFET不仅有效的缩小了器件的尺寸,还大大提升了器件的性能。

Description

一种LDMOSFET、制备方法及芯片和电路
技术领域
本发明涉及半导体领域,具体地涉及一种LDMOSFET、制备方法及芯片和电路。
背景技术
LDMOSFET器件常常被用于各种应用,例如汽车应用中。现有技术中常常通过降低LDMOSFET器件中的表面电场(RESURF)结构来防止高压施加于漏极造成击穿,但是对最高击穿电压的提高不明显。
发明内容
本发明实施例的目的是提供一种LDMOSFET、制备方法及芯片和电路,该LDMOSFET至少解决现有技术的上述部分问题。
本发明的发明人经过研究发现,现有的LDMOSFET最高击穿电压提高不明显的主要原因是,LDMOSFET工艺是平面型的,即器件沟道、源、漏在一个平面,这样限制了其最大击穿电压,并且还造成占用硅片面积较大的问题。
为了实现上述目的,本发明实施例提供一种LDMOSFET,包括:衬底,所述衬底上设有埋层;所述埋层上方设有外延层;所述外延层上方设有N型阱;所述N型阱上方依次设有第一P型体区、N型漂移区和第二P型体区;所述N型漂移区的中间设有间隙,所述间隙的深度小于所述N型漂移区的深度。
可选的,所述间隙的深度小于所述第一P型体区的深度、并且小于第二P型体区的深度。
可选的,所述第一P型体区和第二P型体区上均设有第一高掺杂N离子。
可选的,所述N型漂移区的上方设有第二高掺杂N离子。
可选的,所述间隙的内侧设有侧墙。
可选的,所述第一P型体区的深度和第二P型体区的深度均小于所述N型漂移区的深度。
可选的,所述LDMOSFET的上方设有多晶硅。
可选的,所述衬底为P型衬底。
另一方面,本发明提供一种LDMOSFET的制备方法,包括:形成衬底,所述衬底上设有埋层;所述埋层上方形成外延层;所述外延层上方形成N型阱;所述N型阱上方依次形成第一P型体区、N型漂移区和第二P型体区;所述N型漂移区的中间形成间隙,所述间隙的深度小于所述N型漂移区的深度。
可选的,所述间隙的深度小于所述第一P型体区的深度、并且小于第二P型体区的深度。
可选的,所述第一P型体区和第二P型体区上均形成第一高掺杂N离子。
可选的,所述述N型漂移区的上方形成第二高掺杂N离子。
可选的,所述第一P型体区的深度和第二P型体区的深度均小于所述N型漂移区的深度。
另一方面,本发明提供一种芯片,该芯片包括上述所述的LDMOSFET。
另一方面,本发明提供一种电路,该电路包括上述所述的LDMOSFET。
本发明提供的一种LDMOSFET包括:衬底,所述衬底上设有埋层;所述埋层上方设有外延层;所述外延层上方设有N型阱;所述N型阱上方依次设有第一P型体区、N型漂移区和第二P型体区;所述N型漂移区的中间设有间隙,所述间隙的深度小于所述N型漂移区的深度。所述LDMOSFET通过在N型漂移区的中间设置间隙,提高了器件的击穿电压。
本发明实施例的其它特征和优点将在随后的具体实施方式部分予以详细说明。
附图说明
附图是用来提供对本发明实施例的进一步理解,并且构成说明书的一部分,与下面的具体实施方式一起用于解释本发明实施例,但并不构成对本发明实施例的限制。在附图中:
图1-图2是本发明的一种LDMOSFET的制备方法的示意图。
附图标记说明
100-衬底;
101-埋层;
102-外延层;
103-N型阱;
104-第一P型体区;
105-N型漂移区;
106-第二P型体区;
201-侧墙;
202-多晶硅。
具体实施方式
以下结合附图对本发明实施例的具体实施方式进行详细说明。应当理解的是,此处所描述的具体实施方式仅用于说明和解释本发明实施例,并不用于限制本发明实施例。
本发明提供了一种LDMOSFET,如图2所示,所述LDMOSFET包括:衬底100,所述衬底优选为P型衬底,所述衬底100上设有埋层101;所述埋层101上方设有外延层102;所述外延层102上方设有N型阱103,所述N型阱103优选高压N型阱;所述N型阱103上方依次第一P型体区104、N型漂移区105和第二P型体区106;所述N型漂移区105的中间设有间隙,所述间隙的深度小于所述N型漂移区105的深度。所述间隙的深度小于所述第一P型体区104的深度、并且小于第二P型体区106的深度。所述第一P型体区104和第二P型体区106上均设有第一高掺杂N离子(N+);所述N型漂移区105的上方设有第二高掺杂N离子(N+)。所述第一P型体区104的深度和第二P型体区106的深度均小于所述N型漂移区105的深度。所述LDMOSFET的上方设有多晶硅202。所述间隙的宽度和深度根据具体的LDMOSFET的击穿电压而定,具体的,所述间隙外侧设有两个侧墙201,所述侧墙201为场板,用于隔离,所述间隙也使得所述N型漂移区105的中间内部类似形成一个侧墙,能够承受一部分击穿电压,使得击穿电压不能直接流向第二高掺杂N离子(N+),起到了很好的隔离击穿电压的效果。
本发明还提供了一种LDMOSFET的制备方法,包括:形成衬底100,所述衬底100上设有埋层101;所述埋层101上方形成外延层102;所述外延层102上方形成N型阱103;所述N型阱103上方依次形成第一P型体区104、N型漂移区105和第二P型体区106;所述N型漂移区105的中间形成间隙,所述间隙的深度小于所述N型漂移区105的深度。所述间隙的深度均小于所述第一P型体区104的深度和第二P型体区106的深度。所述第一P型体区104和第二P型体区106上均形成第一高掺杂N离子(N+);所述N型漂移区105的上方形成第二高掺杂N离子(N+)。所述第一P型体区104的深度和第二P型体区106的深度均小于所述N型漂移区105的深度。
图1-图2是本发明的一种LDMOSFET的制备方法的示意图,具体的,如图1所示,在P型衬底上制作N+埋层(BL),然后添加外延层102(EPI),在外延层上面进行离子注入,分布形成N型阱103(HVNW)、第一P型体区104、N型漂移区105及第二P型体区106;然后对N型漂移区105进行光刻操作,最后干法刻蚀N型漂移区105的部分硅及对所述LDMOSFET进行去胶清洗。
如图2所示,接下来对图1的器件的SiO2进行LPCVD,然后干法刻蚀NRF Si的侧面形成侧墙201,所述侧墙201作为场板下面的隔离层,然后栅氧化,LPCVD Polysilicon(多晶硅),Polysilicon(多晶硅)掺杂,栅电极和场板光刻,干法刻蚀后形成栅电极和场板,然后离子注入Arsenic(砷元素),形成LDMOSFET的源极和漏极。
本发明提供的LDMOSFET包括:衬底100,所述衬底100上设有埋层101;所述埋层101上方设有外延层102;所述外延层102上方设有N型阱103;所述N型阱103上方依次设有第一P型体区104、N型漂移区105和第二P型体区106;所述N型漂移区105的中间设有间隙,所述间隙的深度小于所述N型漂移区105的深度。所述LDMOSFET通过在N型漂移区105的中间设置间隙,使得所述N型漂移区105的中间类似形成一个侧墙,能够承受一部分击穿电压,使得击穿电压不能直接流向第二高掺杂N离子(N+),起到了很好的隔离击穿电压的效果,提高了器件的击穿电压。
以上结合附图详细描述了本发明实施例的可选实施方式,但是,本发明实施例并不限于上述实施方式中的具体细节,在本发明实施例的技术构思范围内,可以对本发明实施例的技术方案进行多种简单变型,这些简单变型均属于本发明实施例的保护范围。
另外需要说明的是,在上述具体实施方式中所描述的各个具体技术特征,在不矛盾的情况下,可以通过任何合适的方式进行组合。为了避免不必要的重复,本发明实施例对各种可能的组合方式不再另行说明。
还需要说明的是,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、商品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、商品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括要素的过程、方法、商品或者设备中还存在另外的相同要素。
以上仅为本申请的实施例而已,并不用于限制本申请。对于本领域技术人员来说,本申请可以有各种更改和变化。凡在本申请的精神和原理之内所作的任何修改、等同替换、改进等,均应包含在本申请的权利要求范围之内。

Claims (15)

1.一种LDMOSFET,其特征在于,包括:
衬底,所述衬底上设有埋层;
所述埋层上方设有外延层;
所述外延层上方设有N型阱;
所述N型阱上方依次设有第一P型体区、N型漂移区和第二P型体区;
所述N型漂移区的中间设有间隙,所述间隙的深度小于所述N型漂移区的深度。
2.根据权利要求1所述的LDMOSFET,其特征在于,
所述间隙的深度小于所述第一P型体区的深度、并且小于第二P型体区的深度。
3.根据权利要求1所述的LDMOSFET,其特征在于,
所述第一P型体区和第二P型体区上均设有第一高掺杂N离子。
4.根据权利要求1所述的LDMOSFET,其特征在于,
所述N型漂移区的上方设有第二高掺杂N离子。
5.根据权利要求1所述的LDMOSFET,其特征在于,
所述间隙的内侧设有侧墙。
6.根据权利要求1所述的LDMOSFET,其特征在于,
所述第一P型体区的深度和第二P型体区的深度均小于所述N型漂移区的深度。
7.根据权利要求1所述的LDMOSFET,其特征在于,
所述LDMOSFET的上方设有多晶硅。
8.根据权利要求1所述的LDMOSFET,其特征在于,
所述衬底为P型衬底。
9.一种LDMOSFET的制备方法,特征在于,包括:
形成衬底,所述衬底上设有埋层;
所述埋层上方形成外延层;
所述外延层上方形成N型阱;
所述N型阱上方依次形成第一P型体区、N型漂移区和第二P型体区;
所述N型漂移区的中间形成间隙,所述间隙的深度小于所述N型漂移区的深度。
10.根据权利要求9所述的制备方法,其特征在于,
所述间隙的深度小于所述第一P型体区的深度、并且小于第二P型体区的深度。
11.根据权利要求9所述的制备方法,其特征在于,
所述第一P型体区和第二P型体区上均形成第一高掺杂N离子。
12.根据权利要求9所述的制备方法,其特征在于,
所述述N型漂移区的上方形成第二高掺杂N离子。
13.根据权利要求9所述的制备方法,其特征在于,
所述第一P型体区的深度和第二P型体区的深度均小于所述N型漂移区的深度。
14.一种芯片,其特征在于,该芯片包括权利要求1-8中任一项所述的LDMOSFET。
15.一种电路,其特征在于,该电路包括权利要求1-8中任一项所述的LDMOSFET。
CN202210159448.2A 2022-02-22 2022-02-22 一种ldmosfet、制备方法及芯片和电路 Pending CN114220846A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210159448.2A CN114220846A (zh) 2022-02-22 2022-02-22 一种ldmosfet、制备方法及芯片和电路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210159448.2A CN114220846A (zh) 2022-02-22 2022-02-22 一种ldmosfet、制备方法及芯片和电路

Publications (1)

Publication Number Publication Date
CN114220846A true CN114220846A (zh) 2022-03-22

Family

ID=80709186

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210159448.2A Pending CN114220846A (zh) 2022-02-22 2022-02-22 一种ldmosfet、制备方法及芯片和电路

Country Status (1)

Country Link
CN (1) CN114220846A (zh)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63143860A (ja) * 1986-12-08 1988-06-16 Toshiba Corp 半導体装置及びその製造方法
KR20080001740A (ko) * 2006-06-30 2008-01-04 주식회사 하이닉스반도체 반도체 소자의 리세스 게이트 제조 방법
US20120028426A1 (en) * 2006-08-08 2012-02-02 Alpha And Omega Semiconductor Incorporated Inverted-trench grounded-source FET structure using conductive substrates, with highly doped substrates
CN104538446A (zh) * 2014-12-23 2015-04-22 电子科技大学 一种双向mos型器件及其制造方法
CN105529264A (zh) * 2014-09-30 2016-04-27 中芯国际集成电路制造(上海)有限公司 Ldmos晶体管的形成方法及ldmos晶体管
CN105789055A (zh) * 2016-03-31 2016-07-20 杰华特微电子(杭州)有限公司 Mos结构及其形成方法
CN111668312A (zh) * 2020-06-15 2020-09-15 东南大学 一种低导通电阻的沟槽碳化硅功率器件及其制造工艺

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63143860A (ja) * 1986-12-08 1988-06-16 Toshiba Corp 半導体装置及びその製造方法
KR20080001740A (ko) * 2006-06-30 2008-01-04 주식회사 하이닉스반도체 반도체 소자의 리세스 게이트 제조 방법
US20120028426A1 (en) * 2006-08-08 2012-02-02 Alpha And Omega Semiconductor Incorporated Inverted-trench grounded-source FET structure using conductive substrates, with highly doped substrates
CN105529264A (zh) * 2014-09-30 2016-04-27 中芯国际集成电路制造(上海)有限公司 Ldmos晶体管的形成方法及ldmos晶体管
CN104538446A (zh) * 2014-12-23 2015-04-22 电子科技大学 一种双向mos型器件及其制造方法
CN105789055A (zh) * 2016-03-31 2016-07-20 杰华特微电子(杭州)有限公司 Mos结构及其形成方法
CN111668312A (zh) * 2020-06-15 2020-09-15 东南大学 一种低导通电阻的沟槽碳化硅功率器件及其制造工艺

Similar Documents

Publication Publication Date Title
US10847650B2 (en) Semiconductor structure and associated fabricating method
KR101210014B1 (ko) Mos 장치, mos 장치 제조 방법 및 집적 회로
US20150123199A1 (en) Lateral diffused semiconductor device
JP2008514007A (ja) スタック状ヘテロドーピング周縁部及び徐々に変化するドリフト領域を備えた促進された表面電界低減化高耐圧p型mosデバイス
US8889518B2 (en) LDMOS transistor with asymmetric spacer as gate
CN113964188A (zh) 横向双扩散金属氧化物半导体场效应管及其制作方法
CN114420760B (zh) 横向双扩散场效应晶体管、制作方法、芯片及电路
US7541641B2 (en) Gate structure in a trench region of a semiconductor device and method for manufacturing the same
CN114050181B (zh) 一种nldmos器件及制备方法、芯片
US8450815B2 (en) High voltage device
CN114188402A (zh) 一种ldmosfet、制备方法及芯片、电路
CN111696984B (zh) 半导体器件及其制作方法
CN114171585B (zh) 一种ldmosfet、制备方法及芯片和电路
US8138559B2 (en) Recessed drift region for HVMOS breakdown improvement
CN111509044B (zh) 半导体结构及其形成方法
CN111785637A (zh) 栅极环绕结构的鳍式晶体管及其制造方法
CN109585558B (zh) 具有多个栅极结构的ldmos finfet结构
US20220384641A1 (en) Method for manufacturing semiconductor device, and semiconductor device
CN114220846A (zh) 一种ldmosfet、制备方法及芯片和电路
CN114335156A (zh) 横向双扩散金属氧化物半导体场效应管及其制作方法
CN116207149A (zh) 半导体器件及其制作方法
CN114242777A (zh) 一种ldmosfet、制备方法及芯片和电路
CN111785636A (zh) 并联栅极环绕结构鳍式晶体管及其制造方法
CN114220847B (zh) 一种ldmosfet、制备方法及芯片和电路
CN111883484A (zh) 开关ldmos器件的制造方法

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20220322

RJ01 Rejection of invention patent application after publication