Epitaxial Growth of 2D Ultrathin Metastable γ-Bi 2 O 3 Flakes for High Performance Ultraviolet Photodetection.

Autor: Wu J; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China., Wang F; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China., Li H; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China., Yang S; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China., Li P; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China., Zhao Y; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China., Li Y; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China., Zhai T; State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2022 Jan; Vol. 18 (3), pp. e2104244. Date of Electronic Publication: 2021 Nov 05.
DOI: 10.1002/smll.202104244
Abstrakt: Ultraviolet detection is of great significance due to its wide applications in the missile tracking, flame detecting, pollution monitoring, and so on. The nonlayered semiconductor γ-Bi 2 O 3 is a promising candidate toward high-performance UV detection due to the wide bandgap, excellent light sensitivity, environmental stability, nontoxic and elemental abundance properties. However, controllable preparation of ultrathin 2D γ-Bi 2 O 3 flakes remains a challenge, owing to its nonlayered structure, metastable nature, and other competing phases. Moreover, the UV photodetectors based on 2D γ-Bi 2 O 3 flake have not been implemented yet. Here, ultrathin (down to 4.8 nm) 2D γ-Bi 2 O 3 flakes with high crystal quality are obtained via a van der Waals epitaxy method. The as-synthesized single-crystalline γ-Bi 2 O 3 flakes show a body-centered cubic structure and grown along (111) lattice plane as revealed by experimental observations. More importantly, photodetectors based on the as-synthesized 2D γ-Bi 2 O 3 flakes exhibit promising UV detection ability, including a responsivity of 64.5 A W -1 , a detectivity of 1.3 × 10 13 Jones, and an ultrafast response speed (τ rise  ≈ 290 µs and τ decay  ≈ 870 µs) at 365 nm, suggesting its great potential for various optoelectronic applications.
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
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