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Dark Current Reduction Strategy via a Layer-By-Layer Solution Process for a High-Performance All-Polymer Photodetector

By Zhiming Zhong (1745548), Laju Bu (1651048), Peng Zhu (277243), Tong Xiao (12431), Baobing Fan (4459684), Lei Ying (1605304), Guanghao Lu (2021971), Gang Yu (202259), Fei Huang (9205) and Yong Cao (9208)

Abstract

The 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<sup>–1</sup> at a wavelength of approximately 600 nm and specific detectivity of 5.68 × 10<sup>12</sup> cm Hz<sup>1/2</sup> W<sup>–1</sup> 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

Topics: Biophysics, Medicine, Cell Biology, Molecular Biology, Neuroscience, Biotechnology, Cancer, Space Science, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, approximately 600 nm, gradient component, bulk-heterojunction, photoactive layer, all-polymer photodetector, Reduction Strategy, Layer-By-Layer Solution Process, a morphology, noise spectra, layer-by-layer solution process, High-Performance All-Polymer Photodetector, 1 kHz, detectivity, polymer photodetectors, all-polymer photodetector exhibits
Year: 2019
DOI identifier: 10.1021/acsami.8b20981.s001
OAI identifier: oai:figshare.com:article/7709717
Provided by: FigShare
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