CN104934466B - 一种阳极抬高的ligbt器件及制造方法 - Google Patents

一种阳极抬高的ligbt器件及制造方法 Download PDF

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CN104934466B
CN104934466B CN201510292293.XA CN201510292293A CN104934466B CN 104934466 B CN104934466 B CN 104934466B CN 201510292293 A CN201510292293 A CN 201510292293A CN 104934466 B CN104934466 B CN 104934466B
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成建兵
刘雪松
俞露露
陈旭东
郭厚东
滕国兵
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Nanjing Post and Telecommunication University
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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
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    • H01L29/739Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
    • H01L29/7393Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
    • H01L29/7394Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET on an insulating layer or substrate, e.g. thin film device or device isolated from the bulk substrate
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    • 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
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    • H01L29/083Anode or cathode regions of thyristors or gated bipolar-mode devices
    • H01L29/0834Anode regions of thyristors or gated bipolar-mode devices, e.g. supplementary regions surrounding anode regions
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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
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
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    • 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
    • H01L29/66234Bipolar junction transistors [BJT]
    • H01L29/66325Bipolar junction transistors [BJT] controlled by field-effect, e.g. insulated gate bipolar transistors [IGBT]

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Abstract

本发明涉及一种阳极抬高的LIGBT器件及制造方法,属于电子技术领域。该LIGBT器件将常规短路LIGBT的阳极区的N+抬高,并且将阳极N+和阳极P+之间用介质隔离。这种新型的阳极N+抬高的结构一方面在保证器件较少的关断时间的基础上,在导通时可以消除器件的负阻效应,提高器件的性能和稳定性;另外一方面也可以减小器件的横向尺寸面积。

Description

一种阳极抬高的LIGBT器件及制造方法
技术领域
本发明涉及一种阳极抬高的LIGBT器件及制造方法,属于电子技术领域。
背景技术
横向绝缘栅双极晶体管LIGBT(Lateral Insulator Gate Bipolar Transistor)是MOS栅器件结构与双极晶体管结构相结合而成的复合型功率器件,具有高输入阻抗和低导通压降的特点。和LDMOS不同的是LIGBT是一种双极型器件,导通时不仅有电子电流,阳极P+会向漂移区注入空穴产生电子电流,这就造成关断时间变长。通常降低关断时间的阳极短路结构可以在器件关断时提供一个电子的抽取通道,但是导通时有一个由LDMOS模式向LIGBT模式转变的过程,因此带来负阻效应,影响器件的稳定性。介质隔离LIGBT可以抑制负阻效应,但是因为介质槽深度,宽度的要求会使器件的尺寸变大。阳极P+、N+分离的结构也可以抑制负阻效应,但是同样由于两者之间的距离使器件整体尺寸变大。
发明内容
本发明解决的技术问题是:提出一种在保证器件较少的关断时间的基础上,在导通时可以消除器件的负阻效应,提高器件的性能和稳定性,同时可以减小器件的横向尺寸面积的阳极抬高的LIGBT器件及制造方法。
为了解决上述技术问题所提出的技术方案是:一种阳极抬高的LIGBT器件:在硅衬底1上具有埋氧层2;埋氧层上具有漂移区3;漂移区一侧为阴极区,一侧为阳极区;在P体区4中依次为阴极重掺杂P+区5、阴极重掺杂N+区6;阳极P+区8下轻掺杂N缓冲区7,阳极重掺杂N+区11抬高,抬高部分10高度为d,阳极P+区8和N+区11之间用二氧化硅介质9隔离;器件上部依次为阴极12、栅极13、阳极15、阳极16;阴极重掺杂N+区6、漂移区3之间,P体区4的上端为沟道17;栅极13横跨阴极重掺杂N+区6、沟道17、漂移区3上方,中间有较薄的氧化层14隔离;所述硅衬底1、漂移区3、阴极重掺杂N+区6、N缓冲区7、阳极重掺杂N+区11为N型;阴极P体区4、阴极重掺杂P+区5、阳极重掺杂P+区8为P型。
优选的,所述硅衬底1为SOI硅衬底。
优选的,所述阳极N+抬高的高度d可调。
为了解决上述技术问题提出的技术方案是:一种基于阳极抬高的LIGBT器件,其制造方法包括以下步骤:
第1步,在SOI硅衬底1上外延N漂移区3;
第2步,在N漂移区3注入轻掺杂N缓冲区7;
第3步,在N漂移区3中注入轻掺杂P体区4;
第4步,在表面生长氧化层14,在N漂移区3中刻槽二氧化硅介质9;
第5步,在P体区4中注入阴极重掺杂N+区6,在N漂移区3中注入阳极重掺杂N+区11;
第6步,在P体区4中注入阴极重掺杂P+区5,在N缓冲区7中注入阳极重掺杂P+区8;
第7步,在表面制造电极阴极12,栅极13,阳极15、阳极16。
优选的,所述第一步中,N漂移区3浓度为2×1015cm-3,所述第2、3步中,N缓冲区7、P体区4浓度为3×1016cm-3,所述第5、6步中,阴极重掺杂N+区6、阳极重掺杂N+区11、阴极重掺杂P+区5、阳极重掺杂P+区8浓度为1×1020cm-3
本发明的有益效果是:
本发明将常规短路LIGBT的阳极区的N+抬高,并且将阳极N+和阳极P+之间用介质隔离。与现有技术相比一方面介质9的深度和宽度的要求降低,减小了器件的横向尺寸,另一方面阳极N+抬高改变了导通时电子的流通路径,增大了电子从阳极重掺杂N+区11到阳极重掺杂P+区8的距离,使得器件能够更早的进入LIGBT模式,抑制负阻效应,随着高度d的增加,对负阻效应的抑制作用也增强,提高器件的性能和稳定性;而且关断时依然存在电子抽取通道,使关断时间降低。
附图说明
下面结合附图对本发明的作进一步说明。
图1是普通短路LIGBT剖面示意图;
图2是介质隔离LIGBT器件的剖面示意图;
图3是阳极分离LIGBT器件的剖面示意图;
图4是阳极N+抬高的LIGBT器件的剖面示意图;
具体实施方式
下面对本发明的具体实施方式作进一步的详细描述。
如附图4所示,基于介质隔离与结隔离相结合的LIGBT器件,在硅衬底1上具有埋氧层2;埋氧层上具有漂移区3;漂移区一侧为阴极区,一侧为阳极区;在P体区4中依次为阴极重掺杂P+区5、阴极重掺杂N+区6;阳极P+区8下轻掺杂N缓冲区7,阳极重掺杂N+区11抬高,抬高部分10的高度为d,阳极P+区8和N+区11之间用二氧化硅介质9隔离;器件上部依次为阴极12、栅极13、阳极15、阳极16;阴极重掺杂N+区6、漂移区3之间,P体区4的上端为沟道17;栅极13横跨阴极重掺杂N+区6、沟道17、漂移区3上方,中间有较薄的氧化层14隔离;所述硅衬底1、漂移区3、阴极重掺杂N+区6、N缓冲区7、阳极重掺杂N+区11为N型;阴极P体区4、阴极重掺杂P+区5、阳极重掺杂P+区8为P型。
与普通的阳极短路LIGBT相比较,本发明创新之处在于阳极区的改变,普通阳极短路结构中,如图1所示,阳极N缓冲区包围P+、N+,且二者相连。本发明结构阳极N+抬高,并且N+、P+之间用介质隔离。
该发明结构的优势体现在当LIGBT导通时,由于阳极N+抬高,电子电流的路径改变,电流从阳极N+绕过介质流向阳极P+的距离增加,阳极P+和N缓冲区之间的节点电压升高,使器件能够更早的进入LIGBT模式,因此可以抑制负阻效应;另外器件关断时,因为器件仍然属于短路结构,阳极N+可以对电子进行抽取,保证了关断速度,降低开关损耗。
该发明结构的优势还体现于在消除负阻效应的目标下介质隔离LIGBT,如图2所示,对氧化槽的深度和宽度要求比较大,阳极分离LIGBT,如图3所示,阳极区N+和P+之间同样需要很大的距离,本结构与之相比由于有阳极N+抬高,所以氧化槽的深度、宽度要求相对小得多,在同等P+和N+宽度的情况下器件横向尺寸更小。
基于阳极N+抬高的LIGBT器件,其制造方法包括以下步骤:
第1步,在SOI硅衬底1上外延N漂移区3;
第2步,在N漂移区3注入轻掺杂N缓冲区7;
第3步,在N漂移区3中注入轻掺杂P体区4;
第4步,在表面生长氧化层14,在N漂移区3中刻槽二氧化硅介质9;
第5步,在P体区4中阴极注入重掺杂N+区6,在N漂移区3中注入阳极重掺杂N+区11;
第6步,在P体区4中注入阴极重掺杂P+区5,在N缓冲区7中注入阳极重掺杂P+区8;
第7步,在表面制造电极阴极12、栅极13、阳极15、阳极16。
所述第1步中,N漂移区3浓度为2×1015cm-3,所述第2、3步中,N缓冲区7、P体区4浓度为3×1016cm-3,所述第5、6步中,阴极重掺杂N+区6、阳极重掺杂N+区11、阴极重掺杂P+区5、阳极重掺杂P+区8浓度为1×1020cm-3
与常规阳极短路LIGBT相比此结构在降低关断时间的基础上消除了负阻效应;与介质隔离LIGBT和阳极分离LIGBT相比,此结构器件横向尺寸更小利于集成和节省成本。
上述实施例中的结构、步骤、数值等均为示意,在不违反本发明思想的前提下,本领域的一般技术人员可以进行同等替换,也可以做出若干变形和改进,这些都属于本发明的保护范围。

Claims (5)

1.一种阳极抬高的LIGBT器件,其特征在于:在硅衬底(1)上具有埋氧层(2);埋氧层上具有漂移区(3);漂移区一侧为阴极区,一侧为阳极区;在P体区(4)中依次为阴极重掺杂P+区(5)、阴极重掺杂N+区(6);阳极P+区(8)下轻掺杂N缓冲区(7),阳极重掺杂N+区(11)抬高,抬高部分(10)高度为d,阳极P+区(8)和阳极重掺杂N+区(11)之间用二氧化硅介质(9)隔离;器件上部依次为阴极(12)、栅极(13)、第一阳极(15)、第二阳极(16);阴极重掺杂N+区(6)、漂移区(3)之间,P体区(4)的上端为沟道(17);栅极(13)横跨阴极重掺杂N+区(6)、沟道(17)、漂移区(3)上方,中间有较薄的氧化层(14)隔离;所述硅衬底(1)、漂移区(3)、阴极重掺杂N+区(6)、N缓冲区(7)、阳极重掺杂N+区(11)为N型;阴极P体区(4)、阴极重掺杂P+区(5)、阳极重掺杂P+区(8)为P型。
2.根据权利要求1所述的阳极抬高的LIGBT器件,其特征在于:所述硅衬底(1)为SOI硅衬底。
3.根据权利要求2所述的阳极抬高的LIGBT器件,其特征在于:所述阳极N+抬高,高度d可调。
4.根据权利要求3所述的阳极抬高的LIGBT器件的制造方法,包括以下步骤:
第1步,在SOI硅衬底(1)上外延N漂移区(3);
第2步,在N漂移区(3)注入轻掺杂N缓冲区(7);
第3步,在N漂移区(3)中注入轻掺杂P体区(4);
第4步,在表面生长氧化层(14),在N漂移区(3)中刻槽二氧化硅介质(9);
第5步,在P体区(4)中注入阴极重掺杂N+区(6),在N漂移区(3)中形成N型层抬高部分(10),离子注入或扩散形成阳极重掺杂N+区(11);
第6步,在P体区(4)中注入阴极重掺杂P+区(5),在N缓冲区(7)中注入阳极重掺杂P+区(8);
第7步,在表面制造电极阴极(12)、栅极(13)、第一阳极(15)、第二阳极(16)。
5.根据权利要求4所述的阳极抬高的LIGBT器件的制造方法,其特征在于:所述第1步中,N漂移区(3)浓度为2×1015cm-3,所述第2、3步中,N缓冲区(7)、P体区(4)浓度为3×1016cm-3,所述第5、6步中,阴极重掺杂N+区(6)、阳极重掺杂N+区(11)、阴极重掺杂P+区(5)、阳极重掺杂P+区(8)浓度为1×1020cm-3
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CN204680673U (zh) * 2015-06-01 2015-09-30 南京邮电大学 一种阳极抬高的ligbt器件

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