Polythiophene-based terpolymers with modulated aggregation behaviors for high-performance organic solar cells with 16.6% efficiency
- Authors
- Jeong, Dahyun; Lee, Jin-Woo; Lee, Seungjin; Kim, Geon-U; Jeon, Hyesu; Kim, Seoyoung; Yang, Changduk; Lee, Changyeon; Kim, Bumjoon J.
- Issue Date
- Sep-2023
- Publisher
- Elsevier BV
- Keywords
- Blend morphology; Organic solar cells; Polymer aggregation; Polythiophene-based donor
- Citation
- Nano Energy, v.114
- Journal Title
- Nano Energy
- Volume
- 114
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69768
- DOI
- 10.1016/j.nanoen.2023.108618
- ISSN
- 2211-2855
2211-3282
- Abstract
- Polythiophenes (PTs) are an attractive class of polymer donors (PDs) for organic solar cells (OSCs) owing to their relatively simple structures and scalable synthesis. Herein, a series of chlorinated thiazole-incorporated PT terpolymers are designed and high-performance OSCs with a power conversion efficiency (PCE) of 16.6% are demonstrated. By incorporating two different units, 3,3′-difluoro-2,2′-bithiophene (T2F2) and thieno[3,2-b]thiophene (TT), the aggregation properties of the terpolymers (PTz-FX; X = 0, 30, 50, 70, and 100, where X represents the mole percentage of T2F2 to total T2F2 +TT) are modulated. Among the PTz-FX series, PTz-F70 is found to be the optimal PD because its suitably tuned aggregation property leads to an optimized blend morphology with well-developed crystalline structures and donor–acceptor intermixed domains. The balanced morphology not only promotes charge generation/transport but also suppresses charge recombination in OSC devices. Thus, the PTz-F70-based OSCs achieve the highest PCE (16.6%), outperforming the OSCs based on PTz-FX with extremely strong (PTz-F100, PCE = 14.7%) or weak (PTz-F0, PCE = 12.0%) aggregation properties. The PCE of the PTz-F70-based OSCs is one of the highest performances among PT-based binary OSCs. This study highlights the importance of controlling the aggregation property of PTs for achieving high-performance PT-based OSCs. © 2023 Elsevier Ltd
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