Low‐Noise and Large‐Linear‐Dynamic‐Range Photodetectors Based on Hybrid‐Perovskite Thin‐Single‐Crystals. Issue 39 (28th August 2017)

• Record Type: Journal Article
• Authors: Bao, Chunxiong; Chen, Zhaolai; Fang, Yanjun; Wei, Haotong; Deng, Yehao; Xiao, Xun; Li, Lingliang; Huang, Jinsong
• Is Part Of: Advanced materials. Volume 29:Issue 39(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-08-28
• Subjects: hybrid perovskites -- linear dynamic range -- photodetectors -- sensitivity; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201703209
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: 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 CH3 NH3 PbBr3 and CH3 NH3 PbI3 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 CH3 NH3 PbBr3 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. Abstract : Photodetectors based on organic–inorganic halide perovskite thin single crystals (TSCs) are fabricated. Due to the absence of grain‐boundaries, very low trap densities, and small thickness (≈10 µm) of the TSCs, the TSC photodetectors with vertical p–i–n structure show low noise (1–2 fA Hz −1/2 ), high specific detectivity (≈1.5 × 10 13 cm Hz 1/2 W −1 ), and large linear‐dynamic‐range (256 dB).