Over 15% Efficiency Polymer Solar Cells Enabled by Conformation Tuning of Newly Designed Asymmetric Small‐Molecule Acceptors

Guo, Qing; Ma, Ruijie; Hu, Jun; Wang, Zaiyu; Sun, Huiliang; Dong, Xingliang; Luo, Zhenghui; Liu, Tao; Guo, Xia; Guo, Xugang; Yan, He; Liu, Feng; Zhang, Maojie

doi:10.1002/adfm.202000383

Title: Over 15% Efficiency Polymer Solar Cells Enabled by Conformation Tuning of Newly Designed Asymmetric Small‐Molecule Acceptors

Journal Article · 16 March 2020 · Advanced Functional Materials

DOI: https://doi.org/10.1002/adfm.202000383 · OSTI ID:1604824

Guo, Qing ^[1]; Ma, Ruijie ^[2]; Hu, Jun ^[1]; Wang, Zaiyu ^[3]; Sun, Huiliang ^[4]; Dong, Xingliang ^[1]; Luo, Zhenghui ^[2]; Liu, Tao ^[2]; Guo, Xia ^[1]; Guo, Xugang ^[4];

^[2]; Liu, Feng ^[3];

^[1]

Laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration &, Reconstruction Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong
Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiaotong University Shanghai 200240 China
Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics Southern University of Science and Technology (SUSTech) Shenzhen Guangdong 518055 China

Abstract The prosperous period of polymer solar cells (PSCs) has witnessed great progress in molecule design methods to promote power conversion efficiency (PCE). Designing asymmetric structures has been proved effective in tuning energy level and morphology, which has drawn strong attention from the PSC community. Two hepta‐ring and octa‐ring asymmetric small molecular acceptors (SMAs) (IDTP‐4F and IDTTP‐4F) with S‐shape and C‐shape confirmations are developed to study the relationship between conformation shapes and PSC efficiencies. The similarity of absorption and energy levels between two SMAs makes the conformation a single variable. Additionally, three wide‐bandgap polymer donors (PM6, S1, and PM7) are chosen to prove the universality of the relationship between conformation and photovoltaic performance. Consequently, the champion PCE afforded by PM7: IDTP‐4F is as high as 15.2% while that of PM7: IDTTP‐4F is 13.8%. Moreover, the S‐shape IDTP‐4F performs obviously better than their IDTTP‐4F counterparts in PSCs regardless of the polymer donors, which confirms that S‐shape conformation performs better than the C‐shape one. This work provides an insight into how conformations of asymmetric SMAs affect PCEs, specific functions of utilizing different polymer donors to finely tune the active‐layer morphology and another possibility to reach an excellent PCE over 15%.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1604824

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 21 Vol. 30; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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