Molecular Engineering of a Donor-Acceptor Polymer To Realize Single Band Absorption toward a Red-Selective Thin-Film Organic Photodiode
- Hassan, Syed Zahid; Cheon, Hyung Jin; Choi, Changwon; Yoon, Seongwon; Kang, Mingyun; Cho, Jangwhan; Jang, Yun Hee; Kwon, Soon-Ki; Chung, Dae Sung; Kim, Yun-Hi
- Issue Date
- AMER CHEMICAL SOC
- color-selective; donor-acceptor copolymers; diketopyrrolopyrroles; organic photodiodes; image sensors
- ACS APPLIED MATERIALS & INTERFACES, v.11, no.31, pp.28106 - 28114
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Start Page
- End Page
- 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-ThDPP 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 10(12) Jones while maintaining a thin active layer thickness of similar to 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.
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- 자연과학대학 > 화학과 > Journal Articles
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