CN112086361A - 一种SiC沟槽MOSFET及其制造工艺 - Google Patents

一种SiC沟槽MOSFET及其制造工艺 Download PDF

Info

Publication number
CN112086361A
CN112086361A CN202011034331.9A CN202011034331A CN112086361A CN 112086361 A CN112086361 A CN 112086361A CN 202011034331 A CN202011034331 A CN 202011034331A CN 112086361 A CN112086361 A CN 112086361A
Authority
CN
China
Prior art keywords
layer
mask
sic
manufacturing process
etching
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
CN202011034331.9A
Other languages
English (en)
Inventor
夏华忠
黄传伟
李健
谈益民
吕文生
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.)
Wuxi Roum Semiconductor Technology Co ltd
Original Assignee
Wuxi Roum Semiconductor 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 Wuxi Roum Semiconductor Technology Co ltd filed Critical Wuxi Roum Semiconductor Technology Co ltd
Priority to CN202011034331.9A priority Critical patent/CN112086361A/zh
Publication of CN112086361A publication Critical patent/CN112086361A/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
    • H01L29/66007Multistep 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
    • H01L29/66568Lateral single gate silicon 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
    • H01L29/10Semiconductor 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
    • H01L29/1025Channel region of field-effect devices
    • H01L29/1029Channel region of field-effect devices of field-effect transistors
    • H01L29/1033Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure
    • 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
    • H01L29/12Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
    • H01L29/16Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
    • H01L29/1608Silicon carbide
    • 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
    • H01L29/40Electrodes ; Multistep manufacturing processes therefor
    • H01L29/41Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
    • H01L29/423Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
    • H01L29/42312Gate electrodes for field effect devices
    • H01L29/42316Gate electrodes for field effect devices for field-effect transistors
    • H01L29/4232Gate electrodes for field effect devices for field-effect transistors with insulated gate
    • H01L29/42356Disposition, e.g. buried gate electrode
    • H01L29/4236Disposition, e.g. buried gate electrode within a trench, e.g. trench gate electrode, groove gate electrode
    • 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

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)
  • Electrodes Of Semiconductors (AREA)

Abstract

本发明涉及功率器件技术领域,具体涉及一种SiC沟槽MOSFET及其制造工艺,旨在解决现有技术中因SiC硬度过高,高温推结对掺杂杂质的再分布基本无效果形成的缺陷,其技术要点在于:选用SiC晶圆衬底,并在所述晶圆衬底外延上进行P‑well的注入。淀积第一层掩膜,在晶圆外延表面注入N+Source;去除第一层掩膜,淀积第二层掩膜,并进行P+注入。去除第二层掩膜,然后进行高温退火;淀积第三层掩膜,通过刻蚀打开所述第三层掩膜,并进行栅氧氧化形成栅氧化层及多晶沉积。上述一种SiC沟槽MOSFET制造工艺,先进行掺杂,然后在进行栅氧与多晶的制造,因沟道为垂直结构,对光刻精度要求较低,制造工艺步骤较少,且有效地降低了制造过程的复杂程度。

Description

一种SiC沟槽MOSFET及其制造工艺
技术领域
本发明涉及功率器件技术领域,具体涉及一种SiC沟槽MOSFET制造工艺。
背景技术
碳化硅(SiC)属于第三代半导体材料,具有1X1共价键的硅和碳化合物,其莫氏硬度为13,仅次于钻石(15)和碳化硼(14)。SiC在天然环境下非常罕见,最早是人们在太阳系刚诞生的46亿年前的陨石中,发现了少量这种物质,所以它又被称为“经历46亿年时光之旅的半导体材料”。
SiC作为半导体材料具有优异的性能,尤其是用于功率转换和控制的功率元器件。与传统硅器件相比可以实现低导通电阻、高速开关和耐高温高压工作,因此在电源、汽车、铁路、工业设备和家用消费电子设备中倍受欢迎。
目前SiC通过人工合成可以制造,其也通常应用于沟槽MOSFET的制造,但是由于其材质异常坚硬,制作沟槽MOSFET器件时,高温推结对掺杂杂质的再分布基本无效果。
发明内容
因此,本发明要解决的技术问题在于克服现有技术中因SiC硬度过高,制作沟槽MOSFET器件时,高温推结对掺杂杂质的再分布基本无效果形成的缺陷,从而提供一种SiC沟槽MOSFET制造工艺。
本发明的上述技术目的是通过以下技术方案得以实现的:
一种SiC沟槽MOSFET制造工艺,包含以下步骤:
S1:选用SiC晶圆衬底,并在所述晶圆衬底外延上进行P-well的注入。
S2:淀积生长第一层掩膜,并刻蚀第一层掩膜,然后注入N+source;
S3:去除第一层掩膜,淀积生长第二层掩膜,并进行P+注入。
S4:去除第二层掩膜,然后进行高温退火,以激活掺杂;
S5:淀积生长第三层掩膜,通过刻蚀打开所述第三层掩膜,再进行刻蚀,形成沟槽结构并进行栅氧氧化形成栅氧化层及多晶沉积。
S6:对多晶硅进行光刻、刻蚀,保留沟槽内的多晶硅。
S7:在晶圆外延上进行金属层的生长、光刻及刻蚀形成源极及栅极。
S8:制作背面金属。
在本申请的一些实施方式中,所述第一层掩膜为氧化硅-氮化硅-氧化硅结构的硬掩膜板,第一层掩膜淀积完成后,通过干法刻蚀去除第一层掩膜沟槽处的硬掩膜,注入形成源区N+source。
在本申请的一些实施方式中,所述栅氧化层的形成是通过以下步骤实现的:在晶圆外延生长牺牲氧化膜,刻蚀去除牺牲氧化膜,在沟槽区的沟槽壁形成栅氧化层。
在本申请的一些实施方式中,所述金属层的生长是通过铝溅射得到的。
本申请还提供了一种SiC沟槽MOSFET,使用上述所述一种SiC沟槽MOSFET制造工艺制造得到。
本申请所提供的一种SiC沟槽MOSFET制造工艺,制造过程中,先进行掺杂,然后在进行栅氧与多晶的制造,因沟道为垂直结构,对光刻精度要求较低,制造工艺步骤较少,且有效地降低了制造过程的复杂程度。
附图说明
为了更清楚地说明本发明具体实施方式或现有技术中的技术方案,下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图是本发明的一些实施方式,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明的一种实施方式的一种SiC沟槽MOSFET制造工艺的S1和S2示意图;
图2为本发明的一种实施方式的一种SiC沟槽MOSFET制造工艺的S3-S5示意图;
图3为本发明的一种实施方式的一种SiC沟槽MOSFET制造工艺的S6示意图;
图4为本发明的一种实施方式的一种SiC沟槽MOSFET制造工艺的S7-S8示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
一种SiC沟槽MOSFET制造工艺,包含以下步骤:
S1:请参阅图1,选用SiC晶圆衬底,并在所述晶圆衬底外延上进行P-well的注入。
S2:请参阅图1,淀积生长第一层掩膜,并刻蚀第一层掩膜,然后注入N+source;
在一实施方式中,所述第一层掩膜为氧化硅-氮化硅-氧化硅结构的硬掩膜板,第一层掩膜淀积完成后,通过干法刻蚀去除第一层掩膜沟槽处的硬掩膜,注入形成源区N+source。
S3:请参阅图2,去除第一层掩膜,淀积生长第二层掩膜,并进行P+注入。
S4:去除第二层掩膜,然后进行高温退火,以激活掺杂;
S5:请参阅图2,淀积生长第三层掩膜,通过刻蚀打开所述第三层掩膜,再进行刻蚀,形成沟槽结构并进行栅氧氧化及多晶沉积。
在一实施方式中,所述栅氧化层的形成是通过以下步骤实现的:在晶圆外延上生长牺牲氧化膜,刻蚀去除牺牲氧化膜,在沟槽区的沟槽壁形成栅氧化层。
S6:请参阅图3,对多晶硅进行光刻、刻蚀,保留沟槽内的多晶硅。
S7:请参阅图4,在晶圆外延上进行金属层的生长、光刻及刻蚀形成源极及栅极。
在一实施方式中,所述金属层的生长是通过铝溅射得到的。
S8:请参阅图4,制作背面金属。
一种SiC沟槽MOSFET,通过上述工艺制作得到。
本申请所提供的一种SiC沟槽MOSFET制造工艺,其先进行掺杂,然后再进行栅氧与多晶的制造,因沟道为垂直结构,对光刻精度要求较低,制造工艺步骤较少,且有效地降低了制造过程的复杂程度。
显然,上述实施例仅仅是为清楚地说明所作的举例,而并非对实施方式的限定。对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引伸出的显而易见的变化或变动仍处于本发明创造的保护范围之中。

Claims (5)

1.一种SiC沟槽MOSFET制造工艺,其特征在于:包含以下步骤:
S1:选用SiC晶圆衬底,并在所述晶圆衬底外延上进行P-well的注入;
S2:淀积生长第一层掩膜,并刻蚀第一层掩膜,在晶圆外延表面注入N+source;
S3:去除第一层掩膜,淀积生长第二层掩膜,刻蚀后进行P+注入;
S4:去除第二层掩膜,然后进行高温退火,以激活掺杂;
S5:淀积生长第三层掩膜,通过刻蚀打开所述第三层掩膜后再进行刻蚀,形成沟槽结构,再进行栅氧氧化形成栅氧化层及多晶沉积;
S6:对多晶硅进行光刻、刻蚀,保留沟槽内的多晶硅;
S7:在晶圆外延上进行金属层的生长、光刻及刻蚀形成源极及栅极;
S8:制作背面金属。
2.根据权利要求1所述的一种SiC沟槽MOSFET制造工艺,其特征在于:所述第一层掩膜为氧化硅-氮化硅-氧化硅结构的硬掩膜板,第一层掩膜淀积完成后,通过干法刻蚀去除第一层掩膜沟槽处的硬掩膜,以形成源区。
3.根据权利要求2所述的一种SiC沟槽MOSFET制造工艺,其特征在于:所述栅氧化层的形成是通过以下步骤实现的:在晶圆外延上生长牺牲氧化膜,刻蚀去除牺牲氧化膜,在沟槽区的沟槽壁形成栅氧化层。
4.根据权利要求3所述的一种SiC沟槽MOSFET制造工艺,其特征在于:所述金属层的生长是通过铝溅射得到的。
5.一种SiC沟槽MOSFET,其特征在于:使用权利要求1-4任一一项所述一种SiC沟槽MOSFET制造工艺制造得到。
CN202011034331.9A 2020-09-27 2020-09-27 一种SiC沟槽MOSFET及其制造工艺 Pending CN112086361A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011034331.9A CN112086361A (zh) 2020-09-27 2020-09-27 一种SiC沟槽MOSFET及其制造工艺

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011034331.9A CN112086361A (zh) 2020-09-27 2020-09-27 一种SiC沟槽MOSFET及其制造工艺

Publications (1)

Publication Number Publication Date
CN112086361A true CN112086361A (zh) 2020-12-15

Family

ID=73739097

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011034331.9A Pending CN112086361A (zh) 2020-09-27 2020-09-27 一种SiC沟槽MOSFET及其制造工艺

Country Status (1)

Country Link
CN (1) CN112086361A (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1977386A (zh) * 2004-06-22 2007-06-06 克里公司 碳化硅器件及其制造方法
US20120061682A1 (en) * 2010-09-14 2012-03-15 Toyota Jidosha Kabushiki Kaisha Sic semiconductor device and method for manufacturing the same
CN105047721A (zh) * 2015-08-26 2015-11-11 国网智能电网研究院 一种碳化硅沟槽栅功率MOSFETs器件及其制备方法
CN105633168A (zh) * 2015-12-31 2016-06-01 国网智能电网研究院 一种集成肖特基二极管的SiC沟槽型MOSFET器件及其制造方法
CN107785438A (zh) * 2017-11-27 2018-03-09 北京品捷电子科技有限公司 一种SiC基UMOSFET的制备方法及SiC基UMOSFET

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1977386A (zh) * 2004-06-22 2007-06-06 克里公司 碳化硅器件及其制造方法
US20120061682A1 (en) * 2010-09-14 2012-03-15 Toyota Jidosha Kabushiki Kaisha Sic semiconductor device and method for manufacturing the same
CN105047721A (zh) * 2015-08-26 2015-11-11 国网智能电网研究院 一种碳化硅沟槽栅功率MOSFETs器件及其制备方法
CN105633168A (zh) * 2015-12-31 2016-06-01 国网智能电网研究院 一种集成肖特基二极管的SiC沟槽型MOSFET器件及其制造方法
CN107785438A (zh) * 2017-11-27 2018-03-09 北京品捷电子科技有限公司 一种SiC基UMOSFET的制备方法及SiC基UMOSFET

Similar Documents

Publication Publication Date Title
CN110112215B (zh) 兼具栅介质与刻蚀阻挡功能结构的功率器件及制备方法
CN103928320B (zh) 沟槽栅碳化硅绝缘栅双极型晶体管的制备方法
CN108346688B (zh) 具有CSL输运层的SiC沟槽结势垒肖特基二极管及其制作方法
CN106711207B (zh) 一种纵向沟道的SiC结型栅双极型晶体管及其制备方法
CN105047721A (zh) 一种碳化硅沟槽栅功率MOSFETs器件及其制备方法
CN107680998A (zh) 一种GaN基p型栅HFET器件及其制备方法
JP4449814B2 (ja) 炭化けい素半導体素子の製造方法
CN105720110A (zh) 一种SiC环状浮点型P+结构结势垒肖特基二极管及制备方法
CN109037326A (zh) 一种具有p型埋层结构的增强型hemt器件及其制备方法
CN104810282A (zh) 一种采用n型碳化硅衬底制作n沟道igbt器件的方法
CN106876256A (zh) SiC双槽UMOSFET器件及其制备方法
CN103928309B (zh) N沟道碳化硅绝缘栅双极型晶体管的制备方法
CN103928345B (zh) 离子注入形成n型重掺杂漂移层台面的umosfet制备方法
CN109686667A (zh) 一种SiC基MOS器件及其制备方法和应用
CN109713029A (zh) 一种改善反向恢复特性的多次外延超结器件制作方法
CN115763233B (zh) 一种SiC MOSFET的制备方法
CN116013989A (zh) 具有SiO2阻挡层的垂直结构Ga2O3晶体管及制备方法
CN112086361A (zh) 一种SiC沟槽MOSFET及其制造工艺
CN104900701B (zh) 带有双区浮动结的碳化硅umosfet器件及制作方法
EP1908118B1 (en) Method for producing a semiconductor device
CN103928346B (zh) 外延生长形成n型重掺杂漂移层台面的umosfet器件制备方法
CN111863951A (zh) 增强型复合栅晶体管及其制作方法
CN205621743U (zh) 一种SiC环状浮点型P+结构结势垒肖特基二极管
CN113990918B (zh) 一种具有阶梯屏蔽环的垂直型ⅲ族氮化物功率半导体器件及其制备方法
CN110556415B (zh) 一种高可靠性外延栅的SiC MOSFET器件及其制备方法

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: 20201215

RJ01 Rejection of invention patent application after publication