A simple-structured benzo[1,2-b:4,5-b’]dithiophene-based molecule as a third component enables organic solar cells with over 18.2% efficiency

Liu, Zhihui; Feng, Huanran; Guo, Lihao; Liu, Tianqing; Zhao, Baofeng; Wu, Baohua; Gao, Chao; Ma, Wei; Wu, Weiwei

doi:10.1016/j.dyepig.2023.111423

A simple-structured benzo[1,2-b:4,5-b’]dithiophene-based molecule as a third component enables organic solar cells with over 18.2% efficiency

Journal Article · Fri May 19 00:00:00 EDT 2023 · Dyes and Pigments

DOI:https://doi.org/10.1016/j.dyepig.2023.111423· OSTI ID:2422631

Liu, Zhihui ^[1]; ^[1]; Guo, Lihao ^[1]; Liu, Tianqing ^[1]; Zhao, Baofeng ^[2]; Wu, Baohua ^[3]; Gao, Chao ^[2]; Ma, Wei ^[3]; Wu, Weiwei ^[1]

Xidian University, Shaanxi (China, Republic of)
Xi'an Modern Chemistry Research Institute (China, Republic of)
Xi’an Jiaotong University (China, Republic of)

In this study, research has shown that ternary strategy is an effective tool for improving the performance of organic solar cells (OSCs) and simple-structured small molecules with low-cost and wide bandgap which broadens the scope of the choice in third components recently attracted the attention of researchers. Herein, a small molecule with benzo[1,2-b:4,5-b’]dithiophene (BDT) core named BR-C12 which mixed well with PM6 has been designed and synthesized. Incorporating BR-C12 as third component into PM6:Y6, BR-C12 exhibits a complementary absorption with PM6 and Y6, promoted exciton dissociation and charge collection, reduced bimolecular recombination, resulting in more ordered molecular packing. The PM6:Y6:BR-C12 (1:1.2:0.1, weight ratio) OSC shows an improved power conversion efficiency (PCE) of 17.02% in comparison to host binary devises (16.42%). In addition, by employing BR-C12 as third component into PM6:L8-BO, the ternary device based on PM6:L8-BO:BR-C12 also achieves significant enhancement in device photovoltaic performance with a PCE of 18.26%. In addition, BR-C12-added ternary devices exhibit improved stability than binary ones. This work presents a method for constructing high-performance ternary OSCs and enriches the abundance of materials for the third components.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: Fundamental Research Funds for the Central Universities; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2422631

Journal Information:: Dyes and Pigments, Journal Name: Dyes and Pigments Journal Issue: C Vol. 217; ISSN 0143-7208

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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A simple-structured benzo[1,2-b:4,5-b’]dithiophene-based molecule as a third component enables organic solar cells with over 18.2% efficiency

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