High-Voltage Polarization-Superjunction GaN HEMT With Built-In SBD for Low Reverse Conduction Loss

High-Voltage Polarization-Superjunction GaN HEMT With Built-In SBD for Low Reverse Conduction Loss
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具有内置 SBD 的高压极化超结 GaN HEMT,可实现低反向传导损耗

DOI:
10.1109/jeds.2022.3208731
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发表时间:
2022
影响因子:
2.3
通讯作者:
Xiaorong Luo
Xiaorong Luo
中科院分区:
工程技术3区
文献类型:
--
作者:
Tao Sun;Kemeng Yang;Jie Wei;Yanjiang Jia;Siyu Deng;Zhijia Zhao;Bo Zhang;Xiaorong Luo

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提出并在GaN/AlGaN/GaN平台上制作了GaN反向导电HEMT(RC-HEMT)。它的特点是集成肖特基势垒二极管(SBD)实现反向导通和双异质结提高击穿电压(BV)。与传统HEMT(Con. HEMT)固有的反向导通能力相比,内建SBD具有较低的反向导通电压(<inline-formula><tex-math notation="LaTeX">$V_{\text{RT}}$</tex-math></inline-formula>),且其<inline-formula><tex-math notation="LaTeX">V_{\text{RT}}$</tex-math></inline-formula>与阈值电压和栅偏置无关。在关断状态下,固定的正负极化电荷形成极化超结(PSJ)。因此,扩展了耗尽区,并且获得了更均匀的电场分布。实验结果表明,RC-PSJ-HEMT器件<inline-formula><tex-math notation="LaTeX">的RT值</tex-math></inline-formula>为0.68 V,比Con. HEMT器件的RT值降低了69.1%。RC-PSJ-HEMT的BV(<inline-formula><tex-math notation="LaTeX">7.5\mu \text{m}$</tex-math></inline-formula><inline-formula><tex-math notation="LaTeX">$V_{\text{GD}}$</tex-math></inline-formula>)从Con. HEMT的202 V增加到723 V。
A GaN Reverse-Conducting HEMT (RC-HEMT) is proposed and fabricated on the GaN/AlGaN/GaN platform. It features an integrated Schottky barrier diode (SBD) to realize reverse conduction and the double-heterojunction to enhance breakdown voltage (BV). Compared with the inherent reverse conduction capability of the conventional HEMT (Con. HEMT), the built-in SBD exhibits a low reverse turn-on voltage (<inline-formula> <tex-math notation="LaTeX">$V_{\text{RT}}$ </tex-math></inline-formula>) and its <inline-formula> <tex-math notation="LaTeX">$V_{\text{RT}}$ </tex-math></inline-formula> is independent of the threshold voltage and gate bias. At the off-state, the fixed positive and negative polarization charges form the polarization superjunction (PSJ). Therefore, the depletion region is extended and more uniform E-field distribution is obtained. Experimental results show that the RC-PSJ-HEMT achieves a low <inline-formula> <tex-math notation="LaTeX">$V_{\text{RT}}$ </tex-math></inline-formula> of 0.68 V, which decreases 69.1% compared with that of the Con. HEMT. The BV of the RC-PSJ-HEMT (with <inline-formula> <tex-math notation="LaTeX">$7.5 \mu \text{m}$ </tex-math></inline-formula> <inline-formula> <tex-math notation="LaTeX">$V_{\text{GD}}$ </tex-math></inline-formula>) is increased to 723 V from 202 V of the Con. HEMT.
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