Polymer donors with a new electron-deficient unit for efficient organic solar cells

Polymer donors with a new electron-deficient unit for efficient organic solar cells Full article

Journal

Journal of Materials Chemistry C
ISSN: 2050-7526 , E-ISSN: 2050-7534

Output data

Year: 2025, Volume: 13, Number: 26, Pages: 13347-13354 Pages count : 8 DOI: 10.1039/d5tc01406a

Authors

Zhang Zhe ¹ , Chen Tianqi ² , Dong Xuehang ² , Li Haoyu ¹ , Duan Tainan ³ , Knyazeva Ekaterina A. ⁴ , Chechulina Alexandra S. ⁴ , Rakitin Oleg A. ⁴ , Kan Bin ² , Wan Xiangjian ¹ , Chen Yongsheng ¹

Affiliations

1	The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (RECAST), Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin 300071, China
2	School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin 300350, China
3	Chongqing Institute of Green and Intelligent Technology, Chongqing School, University of Chinese Academy of Sciences, Chinese Academy of Sciences, China
4	N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prosp., 119991 Moscow, Russian Federation

Polymer donors, as a critical component of the active layer in organic solar cells (OSCs), necessitate the development of high-performance variants to further enhance efficiency. The exploration of novel electron-deficient building blocks plays a pivotal role in driving the sustainable advancement of high-performance polymer donors. In this study, we designed a new electron-deficient unit, dithienobenzobisthiadiazole (DTBBT), and synthesized its corresponding polymer materials (PD-1 and PD-2). Both polymers not only possess wide optical bandgaps exceeding 2.0 eV, but also show deep-lying highest occupied molecular orbital (HOMO) energy levels. When blended with a typical nonfullerene acceptor L8-BO, the PD-2:L8-BO-based binary devices achieved a satisfactory power conversion efficiency (PCE) of 16.34%, which could be attributed to their well-matched energy levels. Remarkably, PD-1-based polymer donors exhibit low non-radiative energy losses of only 0.174 eV in spite of its inferior PCE of 5.52%. Our results highlight DTBBT-based polymer donors as promising candidates for suppressing non-radiative energy losses in OSCs, offering new opportunities for further improving the device performance through molecular engineering.

Zhang Z. , Chen T. , Dong X. , Li H. , Duan T. , Knyazeva E.A. , Chechulina A.S. , Rakitin O.A. , Kan B. , Wan X. , Chen Y.
Polymer donors with a new electron-deficient unit for efficient organic solar cells
Journal of Materials Chemistry C. 2025. V.13. N26. P.13347-13354. DOI: 10.1039/d5tc01406a WOS Scopus OpenAlex

Web of science:	WOS:001500397600001
Scopus:	2-s2.0-105007501208
OpenAlex:	W4410302694

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