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Molecular Engineering of a Donor-Acceptor Polymer To Realize Single Band Absorption toward a Red-Selective Thin-Film Organic Photodiode

Molecular Engineering of a Donor-Acceptor Polymer To Realize Single Band Absorption toward a Red-Selective Thin-Film Organic Photodiode
Hassan, Syed ZahidCheon, Hyung JinChoi, ChangwonYoon, SeongwonKang, MingyunCho, JangwhanJang, Yun HeeKwon, Soon-KiChung, Dae SungKim, Yun-Hi
DGIST Authors
Jang, Yun HeeChung, Dae Sung
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Author Keywords
color-selectivedonor-acceptor copolymersdiketopyrrolopyrrolesorganic photodiodesimage sensors
Herein, we explore the strategy of realizing a red-selective thin-film organic photodiode (OPD) by synthesizing a new copolymer with a highly selective red-absorption feature. PCZ-Th-DPP, with phenanthrocarbazole (PCZ) and diketopyrrolopyrrole (DPP) as donor and acceptor units, respectively, was strategically designed/synthesized based on a time-dependent density functional theory calculation, which predicted the significant suppression of the band II absorption of PCZ-Th-DPP due to the extremely efficient intramolecular charge transfer. We demonstrate that the synthesized PCZ-Th-DPP exhibits not only a high absorption coefficient within the red-selective band I region, as theoretically predicted, but also a preferential face-on intermolecular structure in the thin-film state, which is beneficial for vertical charge extraction as an outcome of a glancing incidence X-ray diffraction study. By employing PCZ-Th-DPP as a photoactive layer of Schottky OPD, to fully match its absorption characteristic to the spectral response of the red-selective OPD, we demonstrate a genuine red-selective specific detectivity in the order of 1012 Jones while maintaining a thin active layer thickness of ∼300 nm. This work demonstrates the possibility of realizing a full color image sensor with a synthetic approach to the constituting active layers without optical manipulation. © 2019 American Chemical Society.
American Chemical Society
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  • 장윤희 Jang, Yun Hee 에너지공학과
  • Research Interests Multiscale molecular modeling (quantum mechanics calculation; molecular dynamics simulation) : Supercomputer-assisted molecular-level understanding of materials and their chemistry; which leads to rational design of high-performance organic-inorganic-hybrid materials for clean and renewable energy as well as low-energy-consumption electronic devices
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Department of Energy Science and Engineering Polymer Energy Materials Lab 1. Journal Articles
Department of Energy Science and Engineering CMMM Lab(Curious Minds Molecular Modeling Laboratory) 1. Journal Articles


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