Investigation of Surge Current Capability of GaN E-HEMTs in The Third Quadrant: The Impact of P-GaN Contact

Investigation of Surge Current Capability of GaN E-HEMTs in The Third Quadrant: The Impact of P-GaN Contact
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第三象限 GaN E-HEMT 浪涌电流能力研究:P-GaN 接触的影响

DOI:
10.1109/jestpe.2019.2917523
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发表时间:
2019-05
影响因子:
5.5
通讯作者:
Sheng Kuang
Sheng Kuang
中科院分区:
工程技术1区
文献类型:
--
作者:
Liu Yinxiang;Yang Shu;Han Shaowen;Sheng Kuang

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氮化镓 (GaN) 增强型高电子迁移率晶体管 (E-HEMT) 具有固有的对称横向沟道,非常有利于双向 DC/DC 转换器和 DC/RF 互变系统中的正向和反向传导。在电流过冲/振荡的情况下,GaN E-HEMT将在第三象限承受高浪涌电流,这可能导致器件故障。本文评估了第三象限中两种商用 GaN E-HEMT 的浪涌电流能力,揭示了不同 p-GaN 技术和栅源电压 (<inline-formula> <tex-math notation="LaTeX">$V_{\mathbf {GS}}$ </tex-math></inline-formula> 的影响。欧姆p-GaN接触和高<inline-formula> <tex-math notation="LaTeX">$V_{\mathbf {GS}}$ </tex-math></inline-formula>可实现更高的空穴注入和沟道调制效率,可以增强GaN E-HEMT在反向导通模式下的浪涌电流能力。据我们所知,这是首次研究横向 GaN 功率器件的浪涌电流能力并揭示其基本机制。
Gallium nitride (GaN) enhancement-mode high-electron-mobility transistors (E-HEMTs), featuring an inherently symmetric lateral channel, are highly favorable for both forward and reverse conduction in bidirectional DC/DC converter and DC/RF interconversion systems. Under the circumstances of current overshoot/oscillation, the GaN E-HEMTs would undergo a high surge current in the third quadrant which could possibly result in device failure. In this paper, the surge current capabilities of two types of commercial GaN E-HEMTs in the third quadrant are evaluated, whereby the impacts of different p-GaN technologies and gate-to-source voltage (<inline-formula> <tex-math notation="LaTeX">$V_{\mathbf {GS}}$ </tex-math></inline-formula>) are revealed. The ohmic p-GaN contact and high <inline-formula> <tex-math notation="LaTeX">$V_{\mathbf {GS}}$ </tex-math></inline-formula>, enabling higher efficiency of hole injection and channel modulation, can enhance the surge current capability of GaN E-HEMTs in the reverse conduction mode. To our best knowledge, it is the first time to investigate the surge current capability and to reveal the underlying mechanisms in lateral GaN power devices.
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