4.8 Article

Efficient and Nonhalogenated Solvent-Processed Organic Solar Cells Enabled by Conjugated Donor-Acceptor Block Copolymers Containing the Same Benzodithiophene Unit

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

  1. National Research Foundation of Korea [2020M3D1A2102869, 2020R1A4A1018516]
  2. Korea Research Institute of Chemical Technology (KRICT)
  3. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
  4. Hyundai Motor Chung Mong-Koo Foundation Scholarship Program
  5. National Research Foundation of Korea [2020M3D1A2102869, 2020R1A4A1018516] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

向作者/读者索取更多资源

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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