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Dark Current Reduction Strategy via a Layer-By-Layer Solution Process for a High-Performance All-Polymer Photodetector
journal contribution
posted on 2019-01-30, 00:00 authored by Zhiming Zhong, Laju Bu, Peng Zhu, Tong Xiao, Baobing Fan, Lei Ying, Guanghao Lu, Gang Yu, Fei Huang, Yong CaoThe ideal bulk-heterojunction
for high-performance organic photodetectors
prefers a morphology with a vertically gradient component to
suppress the leaking current. Here, we demonstrate an all-polymer
photodetector with a segregated bulk-heterojunction active layer.
This all-polymer photodetector exhibits a dramatically reduced dark
current density because of its built-in charge blocking layer, with
a responsivity of 0.25 A W–1 at a wavelength of approximately
600 nm and specific detectivity of 5.68 × 1012 cm
Hz1/2 W–1 as calculated from the noise
spectra at 1 kHz. To our knowledge, this is among the best performances
reported for photodetectors based on both polymeric donor and acceptor
in the photoactive layer. These findings present a facile approach
to improving the specific detectivity of polymer photodetectors via
a layer-by-layer solution process.
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approximately 600 nmgradient componentbulk-heterojunctionphotoactive layerall-polymer photodetectorReduction StrategyLayer-By-Layer Solution Processa morphologynoise spectralayer-by-layer solution processHigh-Performance All-Polymer Photodetector1 kHzdetectivitypolymer photodetectorsall-polymer photodetector exhibits
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