Dimer Acceptor Adopting a Flexible Linker for Efficient and Durable Organic Solar Cells

Qi, Feng; Li, Yanxun; Zhang, Rui; Lin, Francis R.; Liu, Kaikai; Fan, Qunping; Jen, Alex K. ‐Y.

doi:10.1002/anie.202303066

Dimer Acceptor Adopting a Flexible Linker for Efficient and Durable Organic Solar Cells

Journal Article · 17 April 2023 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.202303066· OSTI ID:2422670

Qi, Feng ^[1]; Li, Yanxun ^[2]; Zhang, Rui ^[3]; Lin, Francis R. ^[1]; Liu, Kaikai ^[2]; Fan, Qunping ^[4]; ^[5]

Department of Chemistry City University of Hong Kong 999077 Kowloon Hong Kong; Hong Kong Institute for Clean Energy City University of Hong Kong 999077 Kowloon Hong Kong
Department of Materials Science and Engineering City University of Hong Kong 999077 Kowloon Hong Kong; Hong Kong Institute for Clean Energy City University of Hong Kong 999077 Kowloon Hong Kong
Department of Physics Chemistry and Biology (IFM) Linköping University 58183 Linköping Sweden
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University 710049 Xi'an P. R. China
Department of Chemistry City University of Hong Kong 999077 Kowloon Hong Kong; Department of Materials Science and Engineering City University of Hong Kong 999077 Kowloon Hong Kong; Department of Materials Science &, Engineering University of Washington 98195 Seattle WA USA; Hong Kong Institute for Clean Energy City University of Hong Kong 999077 Kowloon Hong Kong

Abstract

Organic solar cells (OSCs) have advanced rapidly due to the development of new photovoltaic materials. However, the long‐term stability of OSCs still poses a severe challenge for their commercial deployment. To address this issue, a dimer acceptor (dT9TBO) with flexible linker is developed for incorporation into small‐molecule acceptors to form molecular alloy with enhanced intermolecular packing and suppressed molecular diffusion to stabilize active layer morphology. Consequently, the PM6 : Y6 : dT9TBO‐based device displays an improved power conversion efficiency (PCE) of 18.41 % with excellent thermal stability and negligible decay after being aged at 65 °C for 1800 h. Moreover, the PM6 : Y6 : dT9TBO‐based flexible OSC also exhibits excellent mechanical durability, maintaining 95 % of its initial PCE after being bended repetitively for 1500 cycles. This work provides a simple and effective way to fine‐tune the molecular packing with stabilized morphology to overcome the trade‐off between OSC efficiency and stability.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 2422670

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 21 Vol. 62; ISSN 1433-7851

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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