CN113517354B - 一种高压jfet器件 - Google Patents

一种高压jfet器件 Download PDF

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CN113517354B
CN113517354B CN202110475900.1A CN202110475900A CN113517354B CN 113517354 B CN113517354 B CN 113517354B CN 202110475900 A CN202110475900 A CN 202110475900A CN 113517354 B CN113517354 B CN 113517354B
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CN113517354A (zh
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乔明
袁章亦安
李欣键
张波
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University of Electronic Science and Technology of China
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    • 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
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    • H01L29/772Field effect transistors
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
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    • H01ELECTRIC ELEMENTS
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    • 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
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Abstract

本发明提供一种高压JFET器件,包括p型衬底、n型漂移区、p型体区、p+区、第一p型降场层、第二p型降场层、n+有源区、n+漏区、场氧化层、n型漂移区、多晶硅栅;n型漂移区内部表面n+源区和p型体区之间包括多个可变掺杂区,多个可变掺杂区沿Y方向、或者X方向交替分布,相邻可变掺杂区之间为p型衬底,可变掺杂区为条形或块状;本发明在器件尺寸不变的前提下,在JFET中引入了一个稀释电阻区域,以减轻空间电荷调制效应,从而增大器件的开态击穿电压。

Description

一种高压JFET器件
技术领域
本发明属于半导体功率器件技术领域。尤其是一种高压JFET器件。
背景技术
对于传统的HV JFET,ON-BV远小于OFF-BV,不能满足高压启动电路中的应用要求。高压JFET在实际工作时,由于空间电荷调制,造成开态击穿电压降低。使得器件在高压应用时,发生开态击穿,限制了高压JFET器件在高压功率集成电路中的应用,尤其是在要求较高电流能力的电路中。在器件尺寸不变的前提下,在JFET中引入了一个稀释电阻区域,以减轻空间电荷调制效应,同时通过适当增加深N阱剂量,弥补由于割条牺牲的电流能力并使ON-BV接近OFF-BV。
发明内容
鉴于以上所述现有技术的缺点,本发明的目的在于提供一种高压JFET器件。
为实现上述发明目的,本发明技术方案如下:
一种高压JFET器件,包括p型衬底1、p型衬底1上方的n型漂移区2、n型漂移区2内部的p型体区6、p型体区6内部的p+区4和第一p型降场层71,p型体区6内部的p+区4位于第一p型降场层17的上方,p型体区6右侧的n型漂移区2内部设有第二p型降场层72,n型漂移区2内部左上方设有n+有源区3;n型漂移区2内部右上方设有n+漏区5,第二p型降场层72上方为场氧化层9,第二p型降场层72和场氧化层9之间为n型漂移区,多晶硅栅8覆盖部分p型体区6、部分场氧化层9、和部分n型漂移区2的上表面,
在平行于器件表面的平面上,沿从n+有源区3到n+漏区5的方向为Y方向,沿垂直于从n+有源区3到n+漏区5的方向为X方向,n型漂移区2内部表面n+源区3和p型体区6之间包括多个可变掺杂区10,多个可变掺杂区10沿Y方向、或者X方向交替分布,相邻可变掺杂区10之间为p型衬底1,可变掺杂区10为条形或块状。
作为优选方式,可变掺杂区10沿Y方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在Y方向上的条宽为Lb,各La相同,各Lb相同。
作为优选方式,可变掺杂区10沿Y方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在Y方向上的条宽为Lb,在Y方向上各间距La渐变,各条宽Lb相同。
作为优选方式,可变掺杂区10沿Y方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在Y方向上的条宽为Lb,各间距La相同,在Y方向上各条宽Lb渐变。
作为优选方式,可变掺杂区10沿X方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在X方向上的条宽为Lb,各La相同,各Lb相同。
作为优选方式,可变掺杂区10沿X方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在X方向上的条宽为Lb,沿X方向上间距La渐变、各条宽Lb相同。
作为优选方式,可变掺杂区10沿X方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在X方向上的条宽为Lb,沿X方向上各间距La相同、条宽Lb渐变。
作为优选方式,可变掺杂区10呈块状,相邻可变掺杂区10之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区10沿X方向的条宽为Lc、Y方向的条宽为Ld,各可变掺杂区10的Lb分别相同,Lc分别相同,Lc分别相同,Ld分别相同。
作为优选方式,可变掺杂区10呈块状,相邻可变掺杂区10之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区10沿X方向的条宽为Lc、Y方向的条宽为Ld,沿X防线各间距La渐变,沿Y方向各间距Lb渐变,各条宽Lc相同,各条宽Ld相同。
作为优选方式,可变掺杂区10呈块状,相邻可变掺杂区10之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区10沿X方向的条宽为Lc、Y方向的条宽为Ld,各间距La相同,各间距Lb相同,沿X方向条宽Lc渐变,沿Y方向条宽Ld渐变。
本发明的有益效果为:在器件尺寸不变的前提下,在JFET中引入了一个稀释电阻区域,以减轻空间电荷调制效应,从而增大器件的开态击穿电压。
附图说明
图1是本发明的半导体器件的结构示意图。
图2是实施例1的结构示意图。
图3是实施例2的结构示意图。
图4是实施例3的结构示意图。
图5是实施例4的结构示意图。
图6是实施例5的结构示意图。
图7是实施例6的结构示意图。
图8是实施例7的结构示意图。
图9是实施例8的结构示意图。
图10是实施例9的结构示意图。
图中,1是p型衬底,2是n型漂移区,3是n+源区,4是p+区,5是n+漏区,6是p型体区,71是第一p型降场层,72是第二p型降场层,8是多晶硅栅,9是场氧化层,10是可变掺杂区。
具体实施方式
以下通过特定的具体实例说明本发明的实施方式,本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用,本说明书中的各项细节也可以基于不同观点与应用,在没有背离本发明的精神下进行各种修饰或改变。
实施例1
一种高压JFET器件,如图1所示,包括p型衬底1、p型衬底1上方的n型漂移区2、n型漂移区2内部的p型体区6、p型体区6内部的p+区4和第一p型降场层71,p型体区6内部的p+区4位于第一p型降场层17的上方,p型体区6右侧的n型漂移区2内部设有第二p型降场层72,n型漂移区2内部左上方设有n+有源区3;n型漂移区2内部右上方设有n+漏区5,第二p型降场层72上方为场氧化层9,第二p型降场层72和场氧化层9之间为n型漂移区,多晶硅栅8覆盖部分p型体区6、部分场氧化层9、和部分n型漂移区2的上表面,
在平行于器件表面的平面上,沿从n+有源区3到n+漏区5的方向为Y方向,沿垂直于从n+有源区3到n+漏区5的方向为X方向,n型漂移区2内部表面n+源区3和p型体区6之间包括多个可变掺杂区10。
如图2所示,多个可变掺杂区10沿Y方向交替分布,相邻可变掺杂区10之间为p型衬底1,可变掺杂区10为条形。相邻可变掺杂区10的间距为La,可变掺杂区10在Y方向上的条宽为Lb,各La相同,各Lb相同。
实施例2
本实施例和实施例1的区别在于:在Y方向上各间距La渐变(沿Y方向La逐渐增大),各条宽Lb相同,条形可变掺杂区数目可变,如图3所示。
实施例3
本实施例和实施例1的区别在于:各间距La相同,在Y方向上各条宽Lb渐变(沿Y方向Lb逐渐减小),条形可变掺杂区数目可变,如图4所示。
实施例4
本实施例和实施例1的区别在于:可变掺杂区10沿X方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在X方向上的条宽为Lb,各La相同,各Lb相同。如图5所示。
实施例5
本实施例和实施例1的区别在于:可变掺杂区10沿X方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在X方向上的条宽为Lb,沿X方向上间距La渐变(从中间到两端La逐渐较小)、各条宽Lb相同。条形可变掺杂区数目可变,如图6所示。
实施例6
本实施例和实施例1的区别在于:可变掺杂区10沿X方向交替分布,可变掺杂区10为条形,相邻可变掺杂区10的间距为La,可变掺杂区10在X方向上的条宽为Lb,沿X方向上各间距La相同、条宽Lb渐变(从中间到两端Lb逐渐增大),条形可变掺杂区数目可变,如图7所示。
实施例7
本实施例和实施例1的区别在于:可变掺杂区10呈块状,相邻可变掺杂区10之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区10沿X方向的条宽为Lc、Y方向的条宽为Ld,各可变掺杂区10的Lb分别相同,Lc分别相同,Lc分别相同,Ld分别相同。块状可变掺杂区数目可变,如图8所示。
实施例8
本实施例和实施例1的区别在于:可变掺杂区10呈块状,相邻可变掺杂区10之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区10沿X方向的条宽为Lc、Y方向的条宽为Ld,沿X方向各间距La渐变(从中间到两端La逐渐增大),沿Y方向各间距Lb渐变(沿Y方向Lb不断增大),各条宽Lc相同,各条宽Ld相同。块状可变掺杂区数目可变,如图9所示。
实施例9
本实施例和实施例1的区别在于:可变掺杂区10呈块状,相邻可变掺杂区10之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区10沿X方向的条宽为Lc、Y方向的条宽为Ld,各间距La相同,各间距Lb相同,沿X方向条宽Lc渐变(从中间到两端Lc不断增大),沿Y方向条宽Ld渐变(沿Y方向Ld不断减小)。块状可变掺杂区数目可变,如图10所示。
上述实施例仅例示性说明本发明的原理及其功效,而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下,对上述实施例进行修饰或改变。因此,凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变,仍应由本发明的权利要求所涵盖。

Claims (10)

1.一种高压JFET器件,其特征在于:包括p型衬底(1)、p型衬底(1)上方的n型漂移区(2)、n型漂移区(2)内部的p型体区(6)、p型体区(6)内部的p+区(4)和第一p型降场层(71),p型体区(6)内部的p+区(4)位于第一p型降场层(71)的上方,p型体区(6)右侧的n型漂移区(2)内部设有第二p型降场层(72),n型漂移区(2)内部左上方设有n+有源区(3);n型漂移区(2)内部右上方设有n+漏区(5),第二p型降场层(72)上方为场氧化层(9),第二p型降场层(72)和场氧化层(9)之间为n型漂移区,多晶硅栅(8)覆盖部分p型体区(6)、部分场氧化层(9)、和部分n型漂移区(2)的上表面,
在平行于器件表面的平面上,沿从n+有源区(3)到n+漏区(5)的方向为Y方向,沿垂直于从n+有源区(3)到n+漏区(5)的方向为X方向,n型漂移区(2)内部表面n+源区(3)和p型体区(6)之间包括多个可变掺杂区(10),多个可变掺杂区(10)沿Y方向、或者X方向交替分布,相邻可变掺杂区(10)之间为p型衬底(1),可变掺杂区(10)为条形或块状。
2.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)沿Y方向交替分布,可变掺杂区(10)为条形,相邻可变掺杂区(10)的间距为La,可变掺杂区(10)在Y方向上的条宽为Lb,各La相同,各Lb相同。
3.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)沿Y方向交替分布,可变掺杂区(10)为条形,相邻可变掺杂区(10)的间距为La,可变掺杂区(10)在Y方向上的条宽为Lb,在Y方向上各间距La渐变,各条宽Lb相同。
4.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)沿Y方向交替分布,可变掺杂区(10)为条形,相邻可变掺杂区(10)的间距为La,可变掺杂区(10)在Y方向上的条宽为Lb,各间距La相同,在Y方向上各条宽Lb渐变。
5.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)沿X方向交替分布,可变掺杂区(10)为条形,相邻可变掺杂区(10)的间距为La,可变掺杂区(10)在X方向上的条宽为Lb,各La相同,各Lb相同。
6.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)沿X方向交替分布,可变掺杂区(10)为条形,相邻可变掺杂区(10)的间距为La,可变掺杂区(10)在X方向上的条宽为Lb,沿X方向上间距La渐变、各条宽Lb相同。
7.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)沿X方向交替分布,可变掺杂区(10)为条形,相邻可变掺杂区(10)的间距为La,可变掺杂区(10)在X方向上的条宽为Lb,沿X方向上各间距La相同、条宽Lb渐变。
8.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)呈块状,相邻可变掺杂区(10)之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区(10)沿X方向的条宽为Lc、Y方向的条宽为Ld,各可变掺杂区(10)的Lb分别相同,Lc分别相同,Lc分别相同,Ld分别相同。
9.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)呈块状,相邻可变掺杂区(10)之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区(10)沿X方向的条宽为Lc、Y方向的条宽为Ld,沿X防线各间距La渐变,沿Y方向各间距Lb渐变,各条宽Lc相同,各条宽Ld相同。
10.根据权利要求1所述的一种高压JFET器件,其特征在于:可变掺杂区(10)呈块状,相邻可变掺杂区(10)之间沿Y方向的间距为Lb、X方向的间距为La,每个可变掺杂区(10)沿X方向的条宽为Lc、Y方向的条宽为Ld,各间距La相同,各间距Lb相同,沿X方向条宽Lc渐变,沿Y方向条宽Ld渐变。
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