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A Highly Sensitive UV–vis–NIR All‐Inorganic Perovskite Quantum Dot Phototransistor Based on a Layered Heterojunction
Author(s) -
Zou Chen,
Xi Yuyin,
Huang ChunYing,
Keeler Ethan G.,
Feng Tianyu,
Zhu Shihao,
Pozzo Lilo D.,
Lin Lih Y.
Publication year - 2018
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.201800324
Subject(s) - materials science , optoelectronics , heterojunction , photodetector , responsivity , photodiode , perovskite (structure) , specific detectivity , ultraviolet , dark current , band gap , quantum dot , fabrication , alternative medicine , pathology , chemical engineering , engineering , medicine
All‐inorganic perovskite quantum dots (IPQDs) are a promising material for use in various optoelectronic devices due to their excellent optoelectronic properties and high environmental stability. Here, a high‐performance phototransistor based on a layered heterojunction composed of CsPbI 3 QDs and a narrow‐bandgap conjugated polymer DPP‐DTT is reported, which shows a high responsivity of 110 A W −1 , a specific detectivity of 2.9 × 10 13 Jones and a light to dark current ratio up to 6 × 10 3 . The heterojunction phototransistor exhibits unipolar p‐type and gate bias modulated behaviors. In addition, the device exhibits a broad spectral detection range from ultraviolet to near infrared. The high sensitivity of the device is attributed to the layered heterojunction and the gate bias modulation property. The work overcomes the existing limitations in sensitivity of IPQD photodetectors due to the poor charge transport between QDs. The convenient solution‐processed fabrication and excellent device performance especially suggest the IPQD/narrow‐bandgap conjugate polymer heterojunction as a promising structure for potential applications of ultrasensitive broadband photodetectors compatible with a wide variety of substrates.