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Highly Efficient and Ultrasensitive Large‐Area Flexible Photodetector Based on Perovskite Nanowires
Author(s) -
Asuo Ivy M.,
Fourmont Paul,
Ka Ibrahima,
Gedamu Dawit,
Bouzidi Soraya,
Pignolet Alain,
Nechache Riad,
Cloutier Sylvain G.
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201804150
Subject(s) - photodetector , materials science , responsivity , photocurrent , perovskite (structure) , optoelectronics , specific detectivity , substrate (aquarium) , fabrication , nanowire , nanotechnology , chemical engineering , medicine , oceanography , alternative medicine , pathology , engineering , geology
Hybrid organic–inorganic perovskites have shown exceptional semiconducting properties and microstructural versatility for inexpensive, solution‐processable photovoltaic and optoelectronic devices. In this work, an all‐solution‐based technique in ambient environment for highly sensitive and high‐speed flexible photodetectors using high crystal quality perovskite nanowires grown on Kapton substrate is presented. At 10 V, the optimized photodetector exhibits a responsivity as high as 0.62 A W −1 , a maximum specific detectivity of 7.3 × 10 12 cm Hz 1/2 W −1 , and a rise time of 227.2 µs. It also shows remarkable photocurrent stability even beyond 5000 bending cycles. Moreover, a deposition of poly(methyl methacrylate) (PMMA) as a protective layer on the perovskite yields significantly better stability under ambient air operation: the PMMA‐protected devices are stable for over 30 days. This work demonstrates a cost‐effective fabrication technique for high‐performance flexible photodetectors and opens opportunities for research advancements in broadband and large‐scale flexible perovskite‐based optoelectronic devices.