期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 67, 期 8, 页码 3341-3347出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2020.3001249
关键词
Band alignment; band bending; carrier transport; gallium oxide; p-n heterojunction (HJ)
资金
- National Key Research and Development Program [2018YFB0406502]
- State Key Research and Development Project of Jiangsu [BE2018115, BE2019103]
- National Nature Science Foundation [61774081, 91850112]
- Shenzhen Fundamental Research Project [20170818110619334, 20180307154632609, 20180307163240991]
- State Key Research and Development Project of Guangdong [2020B010174002]
Engineering oxide interfaces with defined electronic band structures is of vital importance for designing all-oxide devices with controllable multifunctionality and improved performance. Here, we report the band alignment, band bending, and transport mechanism in the NiO/beta-Ga2O3 p-n heterojunction (HJ) which exhibits high performances with a rectification ratio over 10(11), a turn-on voltage of 1.87 V and specific ON-resistance of 10.2 m Omega.cm(2). A type-II band alignment is identified at NiO/beta-Ga2O3 HJs with a valence band offset of 3.60 eV and a conduction band offset of 2.68 eV, respectively, determined from the depth-profiled X-ray photoelectron spectroscopic analysis. Besides band edge discontinuity, an additional built-in potential of 0.78 V is observed at the interface due to the charge transfer across the p-n-junction. In comparison, the NiO/beta-Ga2O3 p-n HJ has lower leakage current and higher breakdown voltage than that of the Ni/Ga2O3 Schottky barrier diode. Capacitance-frequency analysis indicates the presence of interfacial states, and interface recombination is the dominant transport mechanism. The type-II NiO/Ga2O3 HJ provides favorable energetics for facile separation and transportation of photogenerated electrons and holes, which is important for all-oxide devices that require bipolar operation and power devices with higher conversion efficiencies.
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