Efficient and Nonhalogenated Solvent-Processed Organic Solar Cells Enabled by Conjugated Donor-Acceptor Block Copolymers Containing the Same Benzodithiophene Unit
- Authors
- Phan, T.N.-L.; Lee, J.-W.; Oh, E.S.; Lee, S.; Lee, Changyeon; Kim, T.-S.; Li, S.; Kim, B.J.
- Issue Date
- Dec-2022
- Publisher
- American Chemical Society
- Keywords
- benzodithiophene; conjugated block copolymers; nonhalogenated solvent process; organic solar cells; stability
- Citation
- ACS Applied Materials and Interfaces, v.14, no.51, pp 57070 - 57081
- Pages
- 12
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 14
- Number
- 51
- Start Page
- 57070
- End Page
- 57081
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/61130
- DOI
- 10.1021/acsami.2c16908
- ISSN
- 1944-8244
1944-8252
- Abstract
- Organic solar cells (OSCs) based on conjugated block copolymers (CBCs) have gained considerable attention owing to their simple one-pot solution process. However, their power conversion efficiencies (PCEs) require significant improvement. Furthermore, the majority of efficient CBC-based OSCs are processed using environmentally toxic halogenated solvents. Herein, we develop a new CBC (PBDB-T-b-PY5BDT) and demonstrate efficient and stable OSCs achieved by a halogen-free solution process. We design a (D1-A1)-b-(D1-A2)-type CBC (PBDB-T-b-PY5BDT) that shares the same benzodithiophene (BDT) units in donor and acceptor blocks. This alleviates unfavorable molecular interactions between the blocks at their interfaces. The PBDB-T-b-PY5BDT-based devices exhibit a high PCE (10.55%), and they show good mechanical, thermal, and storage stabilities. Importantly, we discuss the potential of our OSCs by preparing two different control systems: one based on a binary polymer blend (PBDB-T:PY5BDT) and another based on a conjugated random copolymer (CRC, PBDB-T-r-PY5BDT). We demonstrate that the photovoltaic performance, device stability, and mechanical robustness of the CBC-based OSCs exceed those of the binary all-polymer solar cells and CRC-based OSCs. © 2022 American Chemical Society.
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