Premium
32.2: Invited Paper: Embedding PbS Quantum Dots (QDs) in MAPbCl 0.5 Br 2.5 Perovskite Single Crystal for Near‐infrared Detection
Author(s) -
Liu Shilin,
Yan Shikai,
Li Qing
Publication year - 2021
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.15148
Subject(s) - quantum dot , materials science , crystal (programming language) , perovskite (structure) , single crystal , optoelectronics , photodetector , passivation , halide , infrared , visible spectrum , nanotechnology , optics , chemistry , crystallography , physics , inorganic chemistry , layer (electronics) , computer science , programming language
Organometal lead‐halide perovskites demonstrate excellent photovoltaic performance in the visible (Vis) region. However, their lack of response in the near‐infrared (NIR) region limits their applications in broadband photodetectors. Here, PbS Quantum Dots (QDs) were successfully embedded in MAPbCl 0.5 Br 2.5 single crystal by solution‐processed epitaxial growth. Perovskites can effectively passivate QDs or act as efficient charge transporters. The mobility of MAPbCl 0.5 Br 2.5 with 1 wt% PbS QDs crystal is about 85 cm 2 /(V‐S), which is similar to that of pure MAPbCl 0.5 Br 2.5 single crystal. Meanwhile the composite crystal exhibited a broadband response wavelength from the Vis (625 nm) to the NIR (850 nm) with fast response times (τ on /τ off = 6/9 ms and τ on /τ off = 19/43 ms in the visible and NIR regions, respectively). These results suggest that we have obtained high‐quality composite crystals.