期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200786
关键词
dual-band photodetection; encrypted communication; imaging; lead-free perovskites; perovskite bulk heterojunction; self-powered devices
资金
- National Key R&D Program of China [2017YFA0204600]
- Inner Mongolia Talent Fund
- National Natural Science Foundation of China [12061131009, 51872050]
- Young Scientist Project of MOE innovation platform, Science and Technology Commission of Shanghai Municipality [21520712600, 19520744300]
This study presents a novel self-powered, dual-band photodetector based on lead-free perovskite bulk heterojunction fabricated using a simple method. The photodetector demonstrates high responsivity, fast response speed, and high detectivity in the ultraviolet band, surpassing most reported lead-free halide perovskite photodetectors. It shows potential in encrypted communication and image sensing applications.
Self-powered, dual-band photodetection of electromagnetic signals promises wide photoelectric applications in imaging, communication, environmental monitoring, and rescue. However, most reported dual-band photodetectors (PDs) based on various heterojunctions are realized by complex fabrication processes, which may introduce defects in the depletion layer. Here, first, a self-powered dual-band PD based on lead-free perovskite bulk heterojunction (Cs3Bi2Br9/Cs3BiBr6) fabricated by a one-step spatial confinement method is demonstrated. Its two peaks of self-powered responsivities are 59.4 mA W-1 at 360 nm and 3.09 mA W-1 at 450 nm. A high on/off ratio (18881), fast response speed (rise time 200 ns; decay time 1.09 mu s), high detectivity (1.2 x 10(12) Jones), and cycle stability are realized under UV band, which exceeds most reported state-of-the-art lead-free halide perovskite PDs. The dual-band PD is suitable for encrypted communication and image sensing. This research represents a new frontier in the search for novel dual-band high-performance PDs based on lead-free perovskite bulk heterojunction fabricated by low-cost and simple fabrication methods.
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