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Perovskite Photosensors Integrated with Silver Resonant‐Cavity Color Filters Display Color Perception Beyond That of the Human Eye
Author(s) -
Lu JongHong,
Cheng MingTsang,
Hsu HsiangLin,
Liu ShunWei,
Chen ChihPing
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202002503
Subject(s) - materials science , optoelectronics , photodetector , dark current , passivation , hue , specific detectivity , perovskite (structure) , optics , layer (electronics) , nanotechnology , physics , engineering , chemical engineering
Organic hybrid perovskite‐based photosensors generally display high responsivities and ultrafast response speeds, but their high dark currents with low detectivities have impeded their commercial applications. In this study, these problems are overcome by modifying the device structure and performing defect passivation of the perovskite. An inverted ITO/NiO x /perovskite/PCBM/BCP/Ag structure is applied to minimize the leakage current from the interlayers. In addition, a urea additive is embedded and the thickness of the perovskite layer is optimized, resulting in an ultralow dark current (<2 pA), a peak detectivity of greater than 1.42 × 10 14 Jones, and a high linear dynamic range (LDR) of up to 162 dB (in the response range from 20.25 to 6.80 × 10 ‐8 mW cm ‐2 ). Using high‐purity color filters, combined with a well‐defined white light illumination system derived from a 3A solar simulator, the photosensitivity is evaluated under light of various hues and intensities (down to 10 ‐9 mW cm ‐2 ). The optimized color sensors under blue, green, orange, and red hues of light display LDRs of greater than 139 dB in the mesopic vision regime (wavelengths: 400–700 nm) between 10 ‐6 and 10 ‐3 mW cm ‐2 —outperforming human visual color perception.