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- Title
Fusing Benzo[c][1,2,5]oxadiazole Unit with Thiophene for Constructing Wide‐bandgap High‐performance IDT‐based Polymer Solar Cell Donor Material.
- Authors
Song, Xin; Fan, Meijie; Zhang, Kaili; Ding, Dakang; Chen, Weiye; Li, Yonghai; Yu, Liangmin; Sun, Mingliang; Yang, Renqiang
- Abstract
Abstract: Benzo[c][1,2,5]oxadiazole (BO) moiety is a strong electron‐withdrawing unit compared to benzo[c][1,2,5]thiadiazole (BT). It is usually introduced as an acceptor to construct narrow band‐gap donor‐acceptor (D‐A) materials. Herein, the π‐extended conjugated moiety dithieno[3′,2′:3,4″;2,3″:5,6]benzo[1,2‐c][1,2,5]oxadiazole (BOT) was adopted as the acceptor moiety to design D‐A polymers. Considering the more extended π‐conjugated molecular system of BOT compared to the BO unit, a narrower optical band‐gap is expected for BOT‐based IDT polymer (PIDT‐BOT). Unexpectedly, the UV‐vis absorption spectra of PIDT‐BOT films display a great hypochromatic shift of about 60 nm compared to a BO‐based analog (PIDT‐BO). The optical band‐gaps of the materials are broadened from 1.63 eV (PIDT‐BO) to 2.00 eV (PIDT‐BOT) accordingly. Although the range of external quantum efficiency (EQE) of PIDT‐BOT‐based polymer solar cell (PSC) devices is not as wide as for PIDT‐BO‐based devices, the EQE response intensities of the PIDT‐BOT based device are evidently high. As a result, PSC devices based on PIDT‐BOT reveal the best power conversion efficiency at 6.08%.
- Subjects
OXADIAZOLES; THIOPHENES; SOLAR cells; ELECTRON donor-acceptor complexes; MOIETIES (Chemistry)
- Publication
Macromolecular Rapid Communications, 2018, Vol 39, Issue 8, p1
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201700782