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Perovskite/Polymer Hybrid Thin Films for High External Quantum Efficiency Photodetectors with Wide Spectral Response from Visible to Near‐Infrared Wavelengths
Author(s) -
Wang Yukun,
Yang Dezhi,
Zhou Xiaokang,
Ma Dongge,
Vadim Agafonov,
Ahamad Tansir,
Alshehri Saad M.
Publication year - 2017
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201700213
Subject(s) - materials science , photodetector , optoelectronics , photodetection , perovskite (structure) , dark current , quantum efficiency , specific detectivity , band gap , infrared , thin film , wavelength , absorption (acoustics) , visible spectrum , optics , nanotechnology , physics , chemical engineering , engineering , composite material
The characteristics such as high charge carrier mobility, long diffusion length, low dark current, and sharp absorption edge of perovskites make the material ideal for realizing photodetection, that is, simultaneously fast and sensitive. However, narrow spectral (850 nm) response limits their application. Here, this study successfully demonstrates an integrated perovskite/polymer device structure based on perovskite/hybrid thin films for efficient light harvesting. The expansion of the photoresponse spectrum is achieved by selecting an appropriate low band gap polymer (poly(diketopyrrolopyrrole‐terthiophene)), which has a wider response (950 nm). It can be seen that the resulting photodetectors (PDs) yield an external quantum efficiency of ≈70% over a 500–700 nm range, and the photoresponse extends to 950 nm, which is obviously wider than the photoresponse of perovskite‐based PDs. Moreover, the dark current density of the hybrid PDs is more efficiently suppressed compared with polymer‐based PDs. The reduced dark current enhances the detectivity and linear dynamic range of the fabricated hybrid PDs, which achieve values of 10 13 Jones and 110 dB, respectively.