An Improved Superjunction Structure With Variation Vertical Doping Profile

An Improved Superjunction Structure With Variation Vertical Doping Profile
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具有变化垂直掺杂分布的改进超结结构

DOI:
10.1109/ted.2014.2372819
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发表时间:
2015
影响因子:
3.1
通讯作者:
Chen Xingbi
Chen Xingbi
中科院分区:
工程技术2区
文献类型:
--
作者:
Lin Zhi;Huang Haimeng;Chen Xingbi

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本文分析了一种改进的垂直掺杂剖面变化超结结构(VVD-SJ)。由于柱中的较高平均掺杂浓度,其特征在于比现有技术在击穿电压(BV)和比导通电阻(罗恩)之间更好的折衷。基于电荷叠加原理,推导了VVD-SJ结构的二维电场模型。优化结果表明,在相同的BV和深宽比下,VVD-SJ结构比SJ结构的导通电阻降低了约10%.目前主流的多重外延生长和注入技术适合于制作VVD-SJ功率MOSFET,且不需要额外的工艺成本。
An analysis of an improved superjunction structure with variation vertical doping profile (VVD-SJ) is presented in this brief. It features a better tradeoff between breakdown voltage (BV) and specific ON-resistance (Ron) than the prior art, due to a higher average doping concentration in columns. A simple 2-D electric field model of the VVD-SJ structure is derived based on charge superposition principle. Optimized results show that the specific ON-resistance of the VVD-SJ structure is reduced by ~10%, compared with the SJ one under the same BV and aspect ratio. The mainstream multiple epitaxial growth and implantation technology is suitable to fabricate the VVD-SJ power MOSFET without extra process cost.
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