Journal
NANOTECHNOLOGY
Volume 29, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aaa456
Keywords
two-dimensional materials; inorganic halide perovskites; photodetectors; heterojunctions; charge transfer
Funding
- National Key Basic Research Program of China [2014CB931702]
- NSFC [51572128, 21403109]
- NSFC-RGC [5151101197]
- National Key Research and Development Program of China [2016YFB0401701]
- Fundamental Research Funds for the Central Universities [30915012205, 30916015106]
- PAPD of Jiangsu Higher Education Institutions
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Inorganic halide perovskites exhibited promising potentials for high-performance wide-band photodetectors (PDs) due to their high light absorption coefficients, long carrier diffusion length and wide light absorption ranges. Here, we report two-dimensional (2D) CsPbBr3/PCBM heterojunctions for sensitive, fast and flexible PDs, whose performances can be greatly boosted by the charge transfer through the energy-aligned interface. The 2D CsPbBr3 nanosheets with high crystallinity were fabricated via a simple solution-process at room temperature, and then assembled into flexible heterojunctions films with polymerphenyl-C61-butyric acid methyl ester (PCBM). Significantly, the efficient and fast charge transfer at the heterojunctions interface was evidenced by the obvious photoluminescence quenching and variation of recombination dynamics. Subsequently, such heterojunctions PD exhibited an enhanced responsivity of 10.85 AW(-1) and an ultrahigh detectivity of 3.06 x 10(13) Jones. In addition, the PD shows a broad linear dynamic range of 73 dB, a fast response speed with rise time of 44 mu s and decay time of 390 mu s, respectively. Moreover, the PD lying on polyethylene terephthalate substrates exhibited an outstanding mechanical flexibility and a robust electrical stability. These results could provide a new avenue for integration of 2D perovskites and organic functional materials and for high-performance flexible PDs.
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