期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 51, 页码 57070-57081出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c16908
关键词
organic solar cells; stability; nonhalogenated solvent process; conjugated block copolymers; benzodithiophene
资金
- National Research Foundation of Korea [2020M3D1A2102869, 2020R1A4A1018516]
- Korea Research Institute of Chemical Technology (KRICT)
- Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
- Hyundai Motor Chung Mong-Koo Foundation Scholarship Program
- National Research Foundation of Korea [2020M3D1A2102869, 2020R1A4A1018516] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Organic solar cells (OSCs) based on conjugated block copolymers (CBCs) have gained attention for their simple solution process, but their power conversion efficiencies (PCEs) need improvement. In this study, a new CBC (PBDB-T-b-PY5BDT) was developed, and efficient and stable OSCs were achieved through a halogen-free solution process. The CBC-based OSCs showed better photovoltaic performance, device stability, and mechanical robustness compared to binary all-polymer solar cells and CRC-based OSCs.
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-bPY5BDT) 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.
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