Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 16, Pages 6880-6886Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c01832
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Funding
- National Key Research and Development Program of China [2018YFB2200500, 2017YFE0123700]
- National Natural Science Foundation of China [61975023, 61925507, 61905264, 61875211, 61520106012, 61674023]
- Natural Science Foundation of Chongqing [cstc2019jcyj-msxmX0522]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201900515]
- Project of Chongqing Normal University Foundation [19XWB014]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jszx-cyzdX0137]
- Strategic Priority Research Program of CAS [XDB16030400]
- CAS Interdisciplinary Innovation Team
- Open Fund of the State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics)
- Program of Shanghai Academic/Technology Research Leader [18XD1404200]
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Lead halide perovskites have received much attention in the field of optoelectronic devices. However, the environment-unfriendly nature and intrinsic instability of these perovskites hamper their commercial applications. In this work, one novel one-dimensional lead-free halide perovskite with high stability, CsCu2I3, was prepared via an antisolvent-assisted crystallization method. The prepared CsCu2I3 bears a high exciton binding energy of similar to 105 meV and a high photoluminescence quantum yield of 12.3%. We fabricated a deep ultraviolet photodetector based on a CsCu2I3 film that is nearly blind to 405 nm visible light but is sensitive to 265 and 365 nm illumination. The device exhibits excellent reproducibility and a high I-light/I-dark ratio of 22 under 265 nm illumination. Furthermore, the responsivity, specific detectivity, and external quantum efficiency are as high as 22.1 mA/W, 1.2 X 10(11) Jones, and 10.3% under a light density of 0.305 mW/cm(2), respectively. These findings demonstrate that CsCu2I3 perovskites should have great potential for future optoelectronics.
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