Journal
SMALL
Volume 16, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202000228
Keywords
2D materials; bismuth oxyhalide; chemical vapor deposition; solar-blind; ultraviolet photodetectors
Categories
Funding
- National Natural Science Foundation of China [21825103, 51727809]
- Hubei Provincial Natural Science Foundation of China [2019CFA002]
- Fundamental Research Funds for the Central University [2019kfyXMBZ018]
- China Postdoctoral Science Foundation [2018M642832]
- Analytical and Testing Center of Huazhong University of Science and Technology
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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 x 10(10) Jones under 250 nm illumination with 17.8 mu W 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.
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