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DOE OSTI · 2422631

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
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Abstract

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.

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14 SOLAR ENERGYChemistryEngineeringHigh-performance deviceMaterials ScienceOrganic solar cellsSimple-structured small moleculeTernary strategybenzo[1,2-b:4,5-b’]dithiophene

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Liu, Zhihui, Feng, Huanran, Guo, Lihao, Liu, Tianqing, Zhao, Baofeng, Wu, Baohua, Gao, Chao, Ma, Wei, Wu, Weiwei. 2023-05-19. 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. https://doi.org/10.1016/j.dyepig.2023.111423

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