Enhanced Performance of GaN Schottky Barrier Diodes by Oxygen Plasma Treatment

Xiaobo Li, Feng Lin, Junye Wu, Zhiyue Zhang, Lijun Song, Taofei Pu, Xicong Li, Xinnan Lin, Youming Lu, Xinke Liu

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, a Ni/GaN Schottky barrier diode (SBD) with both groove beveled and oxygen plasma terminations was fabricated and evaluated. The mixed termination structure was formed by inductive coupled plasma (ICP) in oxygen atmosphere. Confirmed by the measurement results of transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), a 3.5-nm-thick GaOₓ passivation layer and beveled termination with an angle of 65° were identified around the edge of the electrode. Compared with the conventional samples, the treatment samples demonstrated the reverse leakage current reduced by one order of magnitude, the on-resistance reduced by approximately 20%, and the breakdown voltage increased by 80%. Further technology computer-aided design (TCAD) simulation shows that the mixed termination structure can effectively inhibit the electric field concentration effect. Finally, temperature dependence characteristics show that the zero-temperature coefficient (ZTC) bias points of treatment samples locate in the low-voltage region, indicating that the devices are more suitable for the integrated circuit (IC).

Original languageEnglish
Number of pages6
JournalIEEE Transactions on Electron Devices
Early online date24 Feb 2022
DOIs
Publication statusE-pub ahead of print - 24 Feb 2022

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