Control of Buffer-Induced Current Collapse in AlGaN/GaN HEMTs Using SiNx Deposition

Control of Buffer-Induced Current Collapse in AlGaN/GaN HEMTs Using SiNx Deposition
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使用 SiNx 沉积控制 AlGaN/GaN HEMT 中缓冲器引起的电流崩塌

DOI:
10.1109/ted.2017.2738669
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发表时间:
2017
影响因子:
3.1
通讯作者:
Martin Kuball
Martin Kuball
中科院分区:
工程技术2区
文献类型:
--
作者:
W. M. Waller;M. Gajda;S. Pandey;J. Donkers;D. Calton;J. Croon;J. Sonsky;M. Uren;Martin Kuball

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研究表明,低压化学气相沉积氮化硅(SiNx)表面钝化的化学计量比会改变硅基氮化镓功率高电子迁移率晶体管(HEMT)外延堆叠顶部的垂直导电性。这会改变高压操作期间碳掺杂氮化镓层中存储的电荷,并能够直接控制HEMT中与缓冲层相关的电流崩塌。衬底偏压斜坡用于识别碳掺杂氮化镓(C:GaN)电荷俘获和垂直泄漏的变化。沟道长度依赖性表明碳掺杂氮化镓(C:GaN)中存在横向导电性,且在欧姆接触下方垂直导电性局部增加。确定了一种最佳的氮化硅工艺配方,该配方可同时实现低电流崩塌和低漏极泄漏。
The stoichiometry of low-pressure chemical vapor deposition SiNx surface passivation is shown to change vertical conductivity at the top of the epitaxial stack in GaN-on-Si power high-electron mobility transistors (HEMTs). This changes the charge stored in the carbon-doped GaN layer during high-voltage operation, and allows direct control of buffer-related current collapse in HEMTs. Substrate bias ramps are used to identify the changes in C:GaN charge trapping and vertical leakage. Channel length dependence indicates a lateral conductivity in the C:GaN with a localized increase in vertical conductivity under the ohmic contacts. An optimum SiNx recipe is identified which simultaneously delivers low current collapse and low drain leakage.
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