A New Wide Bandgap Donor Polymer for Efficient Nonfullerene Organic Solar Cells with a Large Open-Circuit Voltage
- Authors
- Tang, Yumin; Sun, Huiliang; Wu, Ziang; Zhang, Yujie; Zhang, Guangye; Su, Mengyao; Zhou, Xin; Wu, Xia; Sun, Weipeng; Zhang, Xianhe; Liu, Bin; Chen, Wei; Liao, Qiaogan; Woo, Han Young; Guo, Xugang
- Issue Date
- 11월-2019
- Publisher
- WILEY
- Keywords
- complementary absorption; donor polymers; nonfullerene organic solar cells; nonhalogenated solvents; wide bandgap
- Citation
- ADVANCED SCIENCE, v.6, no.21
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED SCIENCE
- Volume
- 6
- Number
- 21
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/61991
- DOI
- 10.1002/advs.201901773
- ISSN
- 2198-3844
- Abstract
- Significant progress has been made in nonfullerene small molecule acceptors (NF-SMAs) that leads to a consistent increase of power conversion efficiency (PCE) of nonfullerene organic solar cells (NF-OSCs). To achieve better compatibility with high-performance NF-SMAs, the direction of molecular design for donor polymers is toward wide bandgap (WBG), tailored properties, and preferentially ecofriendly processability for device fabrication. Here, a weak acceptor unit, methyl 2,5-dibromo-4-fluorothiophene-3-carboxylate (FE-T), is synthesized and copolymerized with benzo[1,2-b:4,5-b']-bidithiophene (BDT) to afford a series of nonhalogenated solvent processable WBG polymers P1-P3 with a distinct side chain on FE-T. The incorporation of FE-T leads to polymers with a deep highest occupied molecular orbital (HOMO) level of -5.60-5.70 eV, a complementary absorption to NF-SMAs, and a planar molecular conformation. When combined with the narrow bandgap acceptor ITIC-Th, the solar cell based on P1 with the shortest methyl chain on FE-T achieves a PCE of 11.39% with a large V-oc of 1.01 V and a J(sc) of 17.89 mA cm(-2). Moreover, a PCE of 12.11% is attained for ternary cells based on WBG P1, narrow bandgap PTB7-Th, and acceptor IEICO-4F. These results demonstrate that the new FE-T is a highly promising acceptor unit to construct WBG polymers for efficient NF-OSCs.
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Collections - College of Science > Department of Chemistry > 1. Journal Articles
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