Non-fullerene acceptors with high crystallinity and photoluminescence quantum yield enable >20% efficiency organic solar cellsShow others and affiliations
2025 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660Article in journal (Refereed) Epub ahead of print
Abstract [en]
The rational design of non-fullerene acceptors (NFAs) with both high crystallinity and photoluminescence quantum yield (PLQY) is of crucial importance for achieving high-efficiency and low-energy-loss organic solar cells (OSCs). However, increasing the crystallinity of an NFA tends to decrease its PLQY, which results in a high non-radiative energy loss in OSCs. Here we demonstrate that the crystallinity and PLQY of NFAs can be fine-tuned by asymmetrically adapting the branching position of alkyl chains on the thiophene unit of the L8-BO acceptor. It was found that L8-BO-C4, with 2-butyloctyl on one side and 4-butyldecyl on the other side, can simultaneously achieve high crystallinity and PLQY. A high efficiency of 20.42% (certified as 20.1%) with an open-circuit voltage of 0.894 V and a fill factor of 81.6% is achieved for the single-junction OSC. This work reveals how important the strategy of shifting the alkyl chain branching position is in developing high-performance NFAs for efficient OSCs.
Place, publisher, year, edition, pages
NATURE PORTFOLIO , 2025.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-211587DOI: 10.1038/s41563-024-02087-5ISI: 001410701600001PubMedID: 39880932OAI: oai:DiVA.org:liu-211587DiVA, id: diva2:1936589
Note
Funding Agencies|National Natural Science Foundation of China (National Science Foundation of China) [2019YFA0705900]; National Key Research and Development Program of China [62404191]; National Natural Science Foundation of China [Z230018]; Beijing Natural Science Foundation; MOST [2019B030302007]; Basic and Applied Research Major Program of Guangdong Province [JCYJ20200109140801751]; Shen Zhen Technology and Innovation Commission through (Shenzhen Fundamental Research Program) [R6021-18, C6023-19G, 16310019, 16310020, 16309221, 16309822]; Hong Kong Research Grants Council [ITC-CNERC14SC01, FSUST19-CAT0202]; Hong Kong Innovation and Technology Commission [ZSST20SC02]; Zhongshan Municipal Bureau of Science and Technology [2023B1212120003]; Guangdong-Hong Kong-Macao Joint Laboratory; Tencent Xplorer Prize [2019R1A6A1A11044070]; National Research Foundation of Korea [2023A1515111140, 2024A1515012318]; Guangdong Basic and Applied Basic Research Foundation [GZB20230919]; Postdoctoral Fellowship Program of China Postdoctoral Science Foundation
2025-02-112025-02-112025-02-11