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Self‐Confined Growth of Ultrathin 2D Nonlayered Wide‐Bandgap Semiconductor CuBr Flakes
Author(s) -
Gong Chuanhui,
Chu Junwei,
Yin Chujun,
Yan Chaoyi,
Hu Xiaozong,
Qian Shifeng,
Hu Yin,
Hu Kai,
Huang Jianwen,
Wang Hongbo,
Wang Yang,
Wangyang Peihua,
Lei Tianyu,
Dai Liping,
Wu Chunyang,
Chen Bo,
Li Chaobo,
Liao Min,
Zhai Tianyou,
Xiong Jie
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201903580
Subject(s) - materials science , photodetector , optoelectronics , heterojunction , semiconductor , exciton , luminescence , ultraviolet , band gap , wavelength , chemical vapor deposition , photoluminescence , planar , quantum efficiency , chemical bath deposition , nanotechnology , condensed matter physics , physics , computer graphics (images) , computer science
2D planar structures of nonlayered wide‐bandgap semiconductors enable distinguished electronic properties, desirable short wavelength emission, and facile construction of 2D heterojunction without lattice match. However, the growth of ultrathin 2D nonlayered materials is limited by their strong covalent bonded nature. Herein, the synthesis of ultrathin 2D nonlayered CuBr nanosheets with a thickness of about 0.91 nm and an edge size of 45 µm via a controllable self‐confined chemical vapor deposition method is described. The enhanced spin‐triplet exciton ( Z f , 2.98 eV) luminescence and polarization‐enhanced second‐harmonic generation based on the 2D CuBr flakes demonstrate the potential of short‐wavelength luminescent applications. Solar‐blind and self‐driven ultraviolet (UV) photodetectors based on the as‐synthesized 2D CuBr flakes exhibit a high photoresponsivity of 3.17 A W −1 , an external quantum efficiency of 1126%, and a detectivity ( D *) of 1.4 × 10 11 Jones, accompanied by a fast rise time of 32 ms and a decay time of 48 ms. The unique nonlayered structure and novel optical properties of the 2D CuBr flakes, together with their controllable growth, make them a highly promising candidate for future applications in short‐wavelength light‐emitting devices, nonlinear optical devices, and UV photodetectors.