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arXiv 2107.08413physics.app-ph
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0.15 μ m AlGaN/GaN高电子迁移率晶体管的退化机制:热电子效应

Degradation mechanism of 0.15 um AlGaN/GaN HEMTs: effects of hot electrons

Z. Gao, F. Rampazzo, M. Meneghini, C. De Santi, F. Chiocchetta, D. Marcon, G. Meneghesso, E. Zanoni

摘要:

采用热电子阶跃应力和24 h应力试验研究了Fe和C共掺杂的AlGaN/GAN HEMT器件在高、低碳掺杂浓度下的退化机理。首先总结了室温下直流电和电致发光的特性,然后比较了半导通状态下热电子阶跃应力测试过程中的参量演化,认为热电子激活缓冲层中的陷阱,衰减栅漏接入区的电场,破坏栅接触是器件退化的主要机制,并讨论了恒定应力下的参量演化。

英文摘要:

The degradation mechanisms of AlGaN/GaN HEMTs adopting Fe and C co-doping, with high and low carbon doping concentration were investigated by means of hot-electron step stress and 24 hours stress tests. Firstly, DC and EL characterization at room temperature are summarized, then the parametric evolution during hot-electron step stress tests at the semi-on state was compared, the assumption for the degradation mechanism is that hot-electrons activated the pre-existing traps in the buffer, attenuate the electric field in the gate drain access region and damaging the gate contact, the parametric evolution during constant stresses is discussed.

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