Abstract
Y6, as a state-of-the-art nonfullerene acceptor (NFA), is extensively optimized by modifying its side chains and terminal groups. However, the conformation effects on molecular properties and photovoltaic performance of Y6 and its derivatives have not yet been systematically studied. Herein, three Y6 analogs, namely, BP4T-4F, BP5T-4F, and ABP4T-4F, are designed and synthesized. Owing to the asymmetric molecular design strategies, three representative molecular conformations for Y6-type NFAs are obtained through regulating the lateral thiophene orientation of the fused core. It is found that conformation adjustment imposes comprehensive effects on the molecular properties in neat and blend films of these NFAs. As a result, organic solar cells (OSCs) fabricated with PM6:BP4T-4F, PM6:BP5T-4F, and PM6:ABP4T-4F show high power conversion efficiency of 17.1%, 16.7%, and 15.2%, respectively. Interestingly, these NFAs with different conformations also show reduced energy loss (Eloss) in devices via gradually suppressed nonradiative Eloss. Moreover, by employing a selenium-containing analog, CH1007, as the complementary third component, ternary OSCs based on PM6:BP5T-4F:CH1007 (1:1.02:0.18) achieve a 17.2% efficiency. This work helps shed light on engineering the molecular conformation of NFAs to achieve high efficiency OSCs with reduced voltage loss.
Original language | English |
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Article number | 2003177 |
Journal | Advanced Energy Materials |
Volume | 11 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2021 Jan 27 |
Bibliographical note
Funding Information:W.G. and H.F. contributed equally to this work. A. K.-Y. J. thanks for the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science). This work was supported by the APRC Grant of the City University of Hong Kong (9380086 and 9610421), Innovation and Technology Fund (ITS/497/18FP and GHP/021/18SZ), the Office of Naval Research (N00014-20-1-2191), the Air Force Office of Scientific Research (FA9550-18-1-0046), the ECS grant (CityU 21301319) from the Research Grants Council of Hong Kong, Natural Science Foundation of Guangdong Province (2019A1515010761), Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002), and the Fundamental Research (Discipline Arrangement) Project funding from the Shenzhen Science and Technology Innovation Committee (JCYJ20180507181718203). H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF-2016M1A2A2940911 and 2019R1A6A1A11044070).
Funding Information:
W.G. and H.F. contributed equally to this work. A. K.‐Y. J. thanks for the sponsorship of the Lee Shau‐Kee Chair Professor (Materials Science). This work was supported by the APRC Grant of the City University of Hong Kong (9380086 and 9610421), Innovation and Technology Fund (ITS/497/18FP and GHP/021/18SZ), the Office of Naval Research (N00014‐20‐1‐2191), the Air Force Office of Scientific Research (FA9550‐18‐1‐0046), the ECS grant (CityU 21301319) from the Research Grants Council of Hong Kong, Natural Science Foundation of Guangdong Province (2019A1515010761), Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002), and the Fundamental Research (Discipline Arrangement) Project funding from the Shenzhen Science and Technology Innovation Committee (JCYJ20180507181718203). H.Y.W. is grateful for the financial support from the National Research Foundation (NRF) of Korea (NRF‐2016M1A2A2940911 and 2019R1A6A1A11044070).
Publisher Copyright:
© 2020 Wiley-VCH GmbH
Keywords
- asymmetric acceptors
- conformation effects
- energy loss
- organic solar cells
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)