Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination

Ran, Yiyan; Liang, Chengxu; Xu, Zhihao; Jing, Wenwen; Xu, Xiaopeng; Duan, Yuwei; Li, Ruipeng; Yu, Liyang; Peng, Qiang

doi:10.1002/adfm.202311512

Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination

Journal Article · Sat Nov 11 23:00:00 EST 2023 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202311512· OSTI ID:2440565

Ran, Yiyan ^[1]; Liang, Chengxu ^[1]; Xu, Zhihao ^[1]; Jing, Wenwen ^[1]; Xu, Xiaopeng ^[1]; Duan, Yuwei ^[2]; Li, Ruipeng ^[3]; Yu, Liyang ^[1]; ^[1]

Sichuan Univ., Chengdu (China)
Shaanxi Normal University (China)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Employing volatile solid additives have emerged as a promising method to optimize the morphology and improve the performance of organic solar cells (OSCs). However, principles governing the efficient design of solid additives remain elusive. In this work, the programmed fluorination and/or bromination on benzene core to develop efficient additives for OSCs is reported. The programmed fluorination and/or bromination endow the five halogen benzene derivatives, 1,3,5-trifluorobenzene, hexafluorobenzene, 1,3,5-tribromo-2,4,6-trifluorobenzene (TFTB), 1,3,5-tribromobenzene, and hexabromobenzene, with different melting and boiling points, volatility, as well as interactions with the host blend. Studies indicate that the additives with extremely high and low volatility are almost powerless and even detrimental to the morphology evolution. Among them, the combination of fluorine and bromine atoms on TFTB not only enables the more appropriate m.p./b.p. and volatility, but also exerts stronger molecular interactions with the host blend, giving rise to higher ordered molecular packing and more favorable morphology. Importantly, TFTB exhibits good universality to optimize the performances of OSCs with high power conversion efficiencies (PCEs; over 18%) in a group of binary blend systems, and an impressive PCE of 19.43% in the ternary PBTz-F:PM6:L8-BO system.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2440565

Report Number(s):: BNL--226006-2024-JAAM

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 8 Vol. 34; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination

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