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Atomically Thin Oxyhalide Solar‐Blind Photodetectors
Author(s) -
Han Wei,
Li Chen,
Yang Sanjun,
Luo Peng,
Wang Fakun,
Feng Xin,
Liu Kailang,
Pei Ke,
Li Yuan,
Li Huiqiao,
Li Luying,
Gao Yihua,
Zhai Tianyou
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202000228
Subject(s) - responsivity , photodetector , materials science , optoelectronics , ultraviolet , band gap , semiconductor
2D wide‐bandgap semiconductors demonstrate great potential in fabricating solar‐blind ultraviolet (SBUV) photodetectors. However, the low responsivity of 2D solar‐blind photodetectors still limits their practical applications. Here, high‐responsivity solar‐blind photodetectors are achieved based on 2D bismuth oxychloride (BiOCl) flakes. The 2D BiOCl photodetectors exhibit a responsivity up to 35.7 A W −1 and a specific detectivity of 2.2 × 10 10 Jones under 250 nm illumination with 17.8 µW cm −2 power density. In particular, the enhanced photodetective performances are demonstrated in BiOCl photodetectors with increasing ambient temperature. Surprisingly, their responsivity can reach 2060 A W −1 at 450 K under solar‐blind light illumination, maybe owing to the formation of defective BiOCl grains evidenced by in situ transmission electron microscopy. The high responsivity throughout the solar‐blind range indicates that 2D BiOCl is a promising candidate for SBUV detection.