Yen-Ku Lin, S. Noda, R. Lee, Chia-Ching Huang, Q. Luc, S. Samukawa, E. Chang
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引用次数: 1
摘要
报道了一种使用无损伤中性束蚀刻(NBE)栅极凹槽的具有低阈值电压滞后的增强模式AlGaN/GaN miss - hemt。NBE可以消除传统电感耦合等离子体反应刻蚀(ICP-RIE)中由紫外/紫外光子照射产生的等离子体诱导缺陷。结合新的栅极凹槽工艺和peal - aln界面钝化层,Al2O3/AlGaN/GaN增强模式HEMT器件的阈值电压为1.5 V,电流密度为449 mA/mm,三端击穿电压为432 V。在稳定的I-V曲线下,器件对阈值电压的迟滞也很小。
Enhancement-mode AlGaN/GaN MIS-HEMTs with low threshold voltage hysteresis using damage-free neutral beam etched gate recess
An enhancement-mode AlGaN/GaN MIS-HEMTs with low threshold voltage hysteresis using damage-free neutral beam etched (NBE) gate recess is reported. The NBE can eliminate the plasma-induced defects that generated by irradiating UV/VUV photons as encounted in the conventional inductively coupled plasma-reactive-ion etching (ICP-RIE). Combining the new gate recess process and PEALD-AlN interfacial passivation layer, the Al2O3/AlGaN/GaN enhancement-mode HEMT device shows a threshold voltage of 1.5 V and a current density of 449 mA/mm, and the three-terminal breakdown voltage was 432 V. The device also shows small hysteresis in threshold voltage at stable I-V curve.