Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 18, Pages 5343-5350Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b02390
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Funding
- National Natural Science Foundation of China [61575059, 61675062, 21501038]
- Fundamental Research Funds for the Central Universities [JZ2018HGPB0275, JZ2018HGXC0001, JZ2018HGTA0220]
- Open Foundation of Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices [4500-411104/011]
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In this work, a sensitive deep ultraviolet (DUV) light photodetector based on inorganic and lead-free Cs3Cu2I5 crystalline film derived by a solution method was reported. Optoelectronic characterization revealed that the perovskite device exhibited nearly no sensitivity to visible illumination with wavelength of 405 nm but exhibited pronounced sensitivity to both DUV and UV light illumination with response speeds of 26.2/49.9 ms for rise/fall time. The I-light/I-dark ratio could reach 127. What is more, the responsivity and specific detectivity were calculated to be 64.9 mA W-1 and 6.9 x 10(11) Jones, respectively. In addition, the device could keep its photoresponsivity after storage in air environment for a month. It is also found that the capability of Cs3Cu2I5 crystalline film device can readily record still DUV image with acceptable resolution. The above results confirm that the DUV photodetector may hold great potential for future DUV optoelectronic device and systems.
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