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Low‐Noise and Large‐Linear‐Dynamic‐Range Photodetectors Based on Hybrid‐Perovskite Thin‐Single‐Crystals
Author(s) -
Bao Chunxiong,
Chen Zhaolai,
Fang Yanjun,
Wei Haotong,
Deng Yehao,
Xiao Xun,
Li Lingliang,
Huang Jinsong
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201703209
Subject(s) - photodetector , materials science , optoelectronics , crystallite , perovskite (structure) , grain boundary , band gap , thin film , specific detectivity , absorption (acoustics) , optics , dark current , nanotechnology , crystallography , composite material , physics , chemistry , microstructure , metallurgy
Organic–inorganic halide perovskites are promising photodetector materials due to their strong absorption, large carrier mobility, and easily tunable bandgap. Up to now, perovskite photodetectors are mainly based on polycrystalline thin films, which have some undesired properties such as large defective grain boundaries hindering the further improvement of the detector performance. Here, perovskite thin‐single‐crystal (TSC) photodetectors are fabricated with a vertical p–i–n structure. Due to the absence of grain‐boundaries, the trap densities of TSCs are 10–100 folds lower than that of polycrystalline thin films. The photodetectors based on CH 3 NH 3 PbBr 3 and CH 3 NH 3 PbI 3 TSCs show low noise of 1–2 fA Hz −1/2 , yielding a high specific detectivity of 1.5 × 10 13 cm Hz 1/2 W −1 . The absence of grain boundaries reduces charge recombination and enables a linear response under strong light, superior to polycrystalline photodetectors. The CH 3 NH 3 PbBr 3 photodetectors show a linear response to green light from 0.35 pW cm −2 to 2.1 W cm −2 , corresponding to a linear dynamic range of 256 dB.