Band alignment of p-type oxide/ε-Ga2O3 heterojunctions investigated by x-ray photoelectron spectroscopy

doi:10.1088/1674-1056/ab9c0d

Abstract The ε-Ga₂O₃ p-n heterojunctions (HJ) have been demonstrated using typical p-type oxide semiconductors (NiO or SnO). The ε-Ga₂O₃ thin film was heteroepitaxial grown by metal organic chemical vapor deposition (MOCVD) with three-step growth method. The polycrystalline SnO and NiO thin films were deposited on the ε-Ga₂O₃ thin film by electron-beam evaporation and thermal oxidation, respectively. The valence band offsets (VBO) were determined by x-ray photoelectron spectroscopy (XPS) to be 2.17 eV at SnO/ε-Ga₂O₃ and 1.7 eV at NiO/ε-Ga₂O₃. Considering the bandgaps determined by ultraviolet-visible spectroscopy, the conduction band offsets (CBO) of 0.11 eV at SnO/ε-Ga₂O₃ and 0.44 eV at NiO/ε-Ga₂O₃ were obtained. The type-Ⅱ band diagrams have been drawn for both p-n HJs. The results are useful to understand the electronic structures at the ε-Ga₂O₃ p-n HJ interface, and design optoelectronic devices based on ε-Ga₂O₃ with novel functionality and improved performance.

Keywords: ε-Ga₂O₃ x-ray photoelectron spectroscopy (XPS) valence band offset band alignment

Received: 25 March 2020
Revised: 27 May 2020
Accepted manuscript online: 12 June 2020

PACS:	73.40.Lq	(Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)
	82.80.Pv	(Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.))
	73.20.At	(Surface states, band structure, electron density of states)
	73.61.Le	(Other inorganic semiconductors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61774172), the Guangdong Provincial Department of Science and Technology, China (Grant Nos. 2019B010132002 and 2016B090918106), the Pengcheng Scholar Funding (2018), and Shenzhen Science and Technology Innovation Committee, China (Grant No. KQJSCX20180323174713505).

Corresponding Authors: Yanli Pei
E-mail: peiyanli@mail.sysu.edu.cn

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Chang Rao(饶畅), Zeyuan Fei(费泽元), Weiqu Chen(陈伟驱), Zimin Chen(陈梓敏), Xing Lu(卢星), Gang Wang(王钢), Xinzhong Wang(王新中), Jun Liang(梁军), Yanli Pei(裴艳丽) Band alignment of p-type oxide/ε-Ga₂O₃ heterojunctions investigated by x-ray photoelectron spectroscopy 2020 Chin. Phys. B 29 097303

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Band alignment of p-type oxide/ε-Ga2O3 heterojunctions investigated by x-ray photoelectron spectroscopy

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Band alignment of p-type oxide/ε-Ga₂O₃ heterojunctions investigated by x-ray photoelectron spectroscopy