CN113421925B - 一种基于scr的新型凹槽结构esd防护器件 - Google Patents
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Abstract
本发明公开了基于SCR的新型凹槽结构ESD防护器件,包括衬底,衬底上形成n阱区和p阱区,n阱区的右侧与p阱区的左侧相连,n阱区上从左至右形成n阱接触n+区、p+区,p阱区上从左至右形成n+区、p阱接触p+区,n阱接触n+区接阳极电位,n+区接阴极电位,p阱接触p+区接阴极电位,p+区接阳极电位,n阱区的左上角形成第一隔离槽,n阱区上且位于n阱接触n+区和p+区之间形成第二隔离槽,n阱区和p阱区之间形成第三隔离槽,p阱区上且位于n+区和p阱接触p+区之间形成第四隔离槽,p阱区的右上角形成第五隔离槽,第三隔离槽中填充有凹槽,凹槽接阳极电位。本发明防护器件具有维持电压高、触发电压低的特点。
Description
技术领域
本发明属于微电子学与固体电子技术领域,涉及一种基于SCR的新型凹槽结构ESD防护器件。
背景技术
静电放电(ESD)是一种常见的自然现象,在集成电路领域,静电放电是引起电子产品失效、可靠性降低的主要原因之一。随着半导体集成电路的迅速发展,器件特征尺寸不断缩小,遭受静电损伤的风险也随之增大,因此如何有效进行静电防护变得越来越重要。
常用的ESD防护器件有二极管、双极晶体管、场效应管、可控硅整流器等。这其中可控硅整流器(SCR)由于其优异的单位面积电流泄放能力,在静电防护领域备受推崇。传统的SCR用作ESD器件时,其导通时内部寄生的NPN与PNP管相互提供基区电流形成强的正反馈效应,导致其触发后发生明显的回滞(snapback)现象,因此它的维持电压较低,容易引起电源电压的闩锁(latch up)效应,而由于阱区的低掺杂,也导致传统SCR的触发电压较高。为了更好的满足深亚微米乃至纳米工艺中对于ESD设计窗口的要求,需要对传统的SCR进行改进,降低触发电压、提高维持电压,充分发挥其优势,做到扬长避短。
发明内容
本发明的目的是提供一种基于SCR的新型凹槽结构ESD防护器件,解决了现有SCR用作ESD防护器件的维持电压较低、触发电压较高的问题。
本发明所采用的技术方案是,一种基于SCR的新型凹槽结构ESD防护器件,包括衬底,衬底上形成n阱区和p阱区,n阱区的右侧边缘与p阱区的左侧边缘相连,n阱区上从左至右形成n阱接触n+区、p+区,p阱区上从左至右形成n+区、p阱接触p+区,n阱接触n+区接阳极电位,n+区接阴极电位,p阱接触p+区接阴极电位,p+区接阳极电位,n阱区的左上角形成第一隔离槽,第一隔离槽的左侧边缘与衬底的左侧边缘相连,n阱区上且位于n阱接触n+区和p+区之间形成第二隔离槽,n阱区和p阱区之间形成第三隔离槽,p阱区上且位于n+区和p阱接触p+区之间形成第四隔离槽,p阱区的右上角形成第五隔离槽,第五隔离槽的右侧边缘和衬底的右侧边缘相连,第三隔离槽中填充有凹槽,凹槽接阳极电位。
本发明的特征还在于,
凹槽为金属材料或者多晶硅。
凹槽的厚度为0.15μm,宽度为0.5μm。
衬底采用Si,厚度为4μm~4.8μm,掺杂类型为B离子,掺杂浓度为1×1016cm-3。
n阱区采用Si,厚度为0.8μm~0.95μm,掺杂类型为As离子,掺杂浓度为1×1017cm-3。
p阱区采用Si,厚度为0.8μm~0.95μm,掺杂类型为B离子,掺杂浓度为1×1017cm-3。
第一隔离槽、第二隔离槽、第三隔离槽、第四隔离槽和第五隔离槽均采用SiO2,宽度为0.6μm~1μm,厚度为0.2μm。
n阱接触n+区和n+区均采用Si,宽度为0.6μm~1μm,厚度为0.2μm;掺杂类型为As离子,掺杂浓度为1×1020cm-3。
p+区和阱接触p+区均采用Si,宽度为1μm,厚度为0.05μm,掺杂类型为B离子,掺杂浓度为1×1020cm-3。
本发明的有益效果是,本发明一种基于SCR的新型凹槽结构ESD防护器件,在第三隔离槽中填充金属或多晶硅凹槽,接阳极电位的凹槽产生的电场叠加在势垒区原有电场之上,改变了n阱区与p阱区反偏pn结电场分布与电场峰值,从而降低SCR的触发电压。
附图说明
图1是本发明一种基于SCR的新型凹槽结构ESD防护器件结构示意图;
图2是常规基于SCR的ESD防护器件结构示意图;
图3是本发明一种基于SCR的新型凹槽结构ESD防护器件触发时电场分布图;
图4是常规基于SCR的ESD防护器件触发时电场分布图;
图5是本发明一种基于SCR的新型凹槽结构ESD防护器件与常规基于SCR的ESD防护器件阱区反偏pn结附近横向电场分布曲线对比图;
图6是本发明一种基于SCR的新型凹槽结构ESD防护器件与常规基于SCR的ESD防护器件阱区反偏pn结附近纵向电场分布曲线对比图;
图7是本发明一种基于SCR的新型凹槽结构ESD防护器件与常规基于SCR的ESD防护器件准静态I-V特性仿真曲线对比图。
图中,1.衬底,2.n阱区,3.p阱区,4.第一隔离槽,5.n阱接触n+区,6.p+区,7.n+区,8.阱接触p+区,9.凹槽,10.第二隔离槽,11.第三隔离槽,12.第四隔离槽,13.第五隔离槽。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细说明。
本发明提供一种基于SCR的新型凹槽结构ESD防护器件,结构如图1所示,包括衬底1,衬底1上形成n阱区2和p阱区3,n阱区2的右侧边缘与p阱区3的左侧边缘相连,n阱区2上从左至右形成n阱接触n+区5、p+区6,p阱区3上从左至右形成n+区7、p阱接触p+区8,n阱接触n+区5接阳极电位,n+区7接阴极电位,p阱接触p+区8接阴极电位,p+区6接阳极电位,n阱区2的左上角形成第一隔离槽4,第一隔离槽4的左侧边缘与衬底1的左侧边缘相连,n阱区2上且位于n阱接触n+区5和p+区6之间形成第二隔离槽10,n阱区2和p阱区3之间形成第三隔离槽11,p阱区3上且位于n+区7和p阱接触p+区8之间形成第四隔离槽12,p阱区3的右上角形成第五隔离槽13,第五隔离槽13的右侧边缘和衬底1的右侧边缘相连,第三隔离槽11中填充有凹槽9,凹槽9接阳极电位。
凹槽9为金属材料或者多晶硅。
凹槽9的厚度为0.15μm,宽度为0.5μm。
衬底1采用Si,厚度为4μm~4.8μm,掺杂类型为B离子,掺杂浓度为1×1016cm-3。
n阱区2采用Si,厚度为0.8μm~0.95μm,掺杂类型为As离子,掺杂浓度为1×1017cm-3。
p阱区3采用Si,厚度为0.8μm~0.95μm,掺杂类型为B离子,掺杂浓度为1×1017cm-3。
第一隔离槽4、第二隔离槽10、第三隔离槽11、第四隔离槽12和第五隔离槽13均采用SiO2,宽度为0.6μm~1μm,厚度为0.2μm。
n阱接触n+区5和n+区7均采用Si,宽度为0.6μm~1μm,厚度为0.2μm;掺杂类型为As离子,掺杂浓度为1×1020cm-3。
p+区6和阱接触p+区8均采用Si,宽度为1μm,厚度为0.05μm,掺杂类型为B离子,掺杂浓度为1×1020cm-3。
针对本发明基于SCR的新型凹槽结构ESD防护器件与图2所示的常规基于SCR的ESD防护器件结构进行对比,其中掺杂分布,接触面积,尺寸等参数一致;基于Sentaurus TCAD仿真软件,对电学特性进行对比,仿真中采用金属铝作为凹槽9的填充物,结合图3和图4触发时两种防护器件内部的电场分布可得,凹槽9的引入使得器件内部的电场分布发生变化,接阳极电位的凹槽产生新的电场,其方向和阱区反偏pn结势垒区电场方向一致,这个新产生的电场的叠加使得阱区反偏pn结的击穿不再需要较高的外加反向偏压,从而达到降低触发电压的效果;再结合图5和图6触发时两种防护器件阱区反偏pn结附近横向和纵向电场分布曲线对比图可得,在阱区反偏pn结附近,无论是横向还是纵向电场分布曲线,凹槽的引入使得局部位置电场峰值的强度和位置发生改变,使得在外加反向偏压不高的情况下,阱区反向pn结就已经发生击穿。
本发明一种基于SCR的新型凹槽结构ESD防护器件,在第三隔离槽中填充凹槽,凹槽接阳极电位,目的为:增加阱区反偏pn结的电场强度,改变电场分布,以此降低反偏pn结的外加耐压值,使得SCR在用作ESD防护时,更容易触发,更好的满足窄窗口设计;如图7本发明一种基于SCR的新型凹槽结构ESD防护器件与常规基于SCR的ESD防护器件准静态I-V特性仿真曲线对比图,本发明防护器件在不增加工艺难度的情况下,实现了触发电压的显著降低,触发电压由21.53V降低到8.36V,降低了大约61%。
Claims (8)
1.一种基于SCR的凹槽结构ESD防护器件,其特征在于,包括衬底(1),所述衬底(1)上形成n阱区(2)和p阱区(3),所述n阱区(2)的右侧边缘与p阱区(3)的左侧边缘相连,所述n阱区(2)上从左至右形成n阱接触n+区(5)、p+区(6),所述p阱区(3)上从左至右形成n+区(7)、p阱接触p+区(8),所述n阱接触n+区(5)接阳极电位,所述n+区(7)接阴极电位,所述p阱接触p+区(8)接阴极电位,所述p+区(6)接阳极电位,所述n阱区(2)的左上角形成第一隔离槽(4),所述第一隔离槽(4)的左侧边缘与衬底(1)的左侧边缘相连,所述n阱区(2)上且位于n阱接触n+区(5)和p+区(6)之间形成第二隔离槽(10),所述n阱区(2)和p阱区(3)之间形成第三隔离槽(11),所述p阱区(3)上且位于n+区(7)和p阱接触p+区(8)之间形成第四隔离槽(12),所述p阱区(3)的右上角形成第五隔离槽(13),所述第五隔离槽(13)的右侧边缘和衬底(1)的右侧边缘相连,所述第三隔离槽(11)中填充有凹槽(9),所述凹槽(9)接阳极电位;
所述凹槽(9)为金属材料或者多晶硅。
2.根据权利要求1所述的一种基于SCR的凹槽结构ESD防护器件,其特征在于,所述凹槽(9)的厚度为0.15μm,宽度为0.5μm。
3.根据权利要求1所述的一种基于SCR的凹槽结构ESD防护器件,其特征在于,所述衬底(1)采用Si,厚度为4μm~4.8μm,掺杂类型为B离子,掺杂浓度为1×1016cm-3。
4.根据权利要求1所述的一种基于SCR的凹槽结构ESD防护器件,其特征在于,所述n阱区(2)采用Si,厚度为0.8μm~0.95μm,掺杂类型为As离子,掺杂浓度为1×1017cm-3。
5.根据权利要求1所述的一种基于SCR的凹槽结构ESD防护器件,其特征在于,所述p阱区(3)采用Si,厚度为0.8μm~0.95μm,掺杂类型为B离子,掺杂浓度为1×1017cm-3。
6.根据权利要求1所述的一种基于SCR的凹槽结构ESD防护器件,其特征在于,所述第一隔离槽(4)、第二隔离槽(10)、第三隔离槽(11)、第四隔离槽(12)和第五隔离槽(13)均采用SiO2,宽度为0.6μm~1μm,厚度为0.2μm。
7.根据权利要求1所述的一种基于SCR的凹槽结构ESD防护器件,其特征在于,所述n阱接触n+区(5)和n+区(7)均采用Si,宽度为0.6μm~1μm,厚度为0.2μm;掺杂类型为As离子,掺杂浓度为1×1020cm-3。
8.根据权利要求1所述的一种基于SCR的凹槽结构ESD防护器件,其特征在于,所述p+区(6)和阱接触p+区(8)均采用Si,宽度为1μm,厚度为0.05μm,掺杂类型为B离子,掺杂浓度为1×1020cm-3。
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