Flexible self-powered DUV photodetectors with high responsivity utilizing Ga2O3/NiO heterostructure on buffered Hastelloy substrates

Xiao Tang, Yi Lu, Rongyu Lin, Che-Hao Liao, Yue Zhao, Kuang-Hui Li, Na Xiao, Haicheng Cao, Wedyan Babatain, Xiaohang Li

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

In this research, β-Ga2O3/NiO heterostructures were grown directly on CeO2 buffered Hastelloy flexible substrates. With pulsed laser deposition under high temperatures, as-grown β-Ga2O3 and NiO thin films have a preferred out-of-plane orientation along the ⟨−201⟩ and ➎111➉ directions. This is due to the ideal epitaxial ability of the CeO2 buffer layer, which serves as a perfect template for the epitaxial growth of single-oriented NiO and β-Ga2O3 by creating a constant gradient from CeO2 (2.7 Å along ➎001➉) to NiO (2.9 Å along ➎110➉), and eventually to β-Ga2O3 (3.04 Å along ➎010➉). The Hastelloy substrates endow photodetectors with good deformability and mechanical robustness. Moreover, owing to the type-II band alignment of β-Ga2O3/NiO heterostructures, the photodetectors have a good photocurrent at zero bias under 284 nm of light illumination. In addition, the photocurrent is significantly higher than when using an analogous heterostructure (as described in some previous reports), because the β-Ga2O3 and NiO thin films are crystalized along a single orientation with fewer defects.
Original languageEnglish (US)
Pages (from-to)121101
JournalApplied Physics Letters
Volume122
Issue number12
DOIs
StatePublished - Mar 20 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-03-23
Acknowledged KAUST grant number(s): BAS/1/1664-01-01, REP/1/3189-01-01, URF/1/3437-01-01, URF/1/3771-01-01
Acknowledgements: The authors would like to thank the KAUST Baseline Fund via No. BAS/1/1664-01-01, the Competitive Research Grant via Nos. URF/1/3437-01-01 and URF/1/3771-01-01, and the GCC Research Council via Grant No. REP/1/3189-01-01 for their support.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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