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Janus CsPbBr3-AgBiS2 Heteronanocrystals for High-Efficiency Photodetectors
Hengwei Qiu1, Yongqiang Ji2, Wenfan Hu3
1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of New Energy, North China Electric Power University, Beijing 102206, China.
Abstract:
Heteronanocrystals (HNCs) composed of colloidal lead halide perovskites and chalcogenides always offer unique photoelectric properties. Nevertheless, synthesizing perovskite-chalcogenide HNCs has been a tough challenge due to their completely different growth dynamics. Here, we present an effective strategy to synthesize Janus CsPbBr3-AgBiS2 HNCs by in situ growth of CsPbBr3 NCs on prepared AgBiS2 quantum dot (QDs). The as-synthesized HNCs show a large range of absorption characteristics from visible to near-infrared (NIR) wavebands. Femtosecond transient absorption (TA) spectroscopy reveals the transfer of both electron and hole from CsPbBr3 to AgBiS2. The enhanced absorption range and exciton dissociation in 150 °C HNCs leads to photoconductors with drastically improved responsivity (R of 183.8 A W-1) and specific detectivity (D* of 5.0 × 1014 Jones). This work not only provides a reliable method for combining ionic CsPbBr3 and covalent AgBiS2 but also has great potential for future practical applications, such as an NC (QD) solar cell.
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