Highly crystalline acceptor materials based on benzodithiophene with different amount of fluorine substitution on alkoxyphenyl conjugated side chains for organic photovoltaics

Youdi Zhang; Ruijie Ma; Yong Wang; Ying Wang; Tao Liu; Yiqun Xiao; Yongjoon Cho; Zhenghui Luo; Xinhui Lu; Lun Zhao; Zhongyi Yuan; Changduk Yang; He Yan; Yiwang Chen

Materials Reports: Energy (Nov 2021)

Highly crystalline acceptor materials based on benzodithiophene with different amount of fluorine substitution on alkoxyphenyl conjugated side chains for organic photovoltaics

Youdi Zhang,
Ruijie Ma,
Yong Wang,
Ying Wang,
Tao Liu,
Yiqun Xiao,
Yongjoon Cho,
Zhenghui Luo,
Xinhui Lu,
Lun Zhao,
Zhongyi Yuan,
Changduk Yang,
He Yan,
Yiwang Chen

Affiliations

Youdi Zhang: College of Chemistry, Changchun Normal University, Changchun, 130032, Jilin, China
Ruijie Ma: Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Hong Kong, China
Yong Wang: College of Chemistry, Nanchang University, Nanchang, 330031, China
Ying Wang: College of Chemistry, Nanchang University, Nanchang, 330031, China
Tao Liu: Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Hong Kong, China; Corresponding author.
Yiqun Xiao: Department of Physics, Chinese University of Hong Kong, Hong Kong, China
Yongjoon Cho: Department of Energy Engineering, School of Energy and Chemical Engineering, Perovtronics Research Center, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
Zhenghui Luo: Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Hong Kong, China
Xinhui Lu: Department of Physics, Chinese University of Hong Kong, Hong Kong, China
Lun Zhao: College of Chemistry, Changchun Normal University, Changchun, 130032, Jilin, China; Corresponding author.
Zhongyi Yuan: College of Chemistry, Nanchang University, Nanchang, 330031, China
Changduk Yang: Department of Energy Engineering, School of Energy and Chemical Engineering, Perovtronics Research Center, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
He Yan: Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology (HKUST), Hong Kong, China
Yiwang Chen: College of Chemistry, Nanchang University, Nanchang, 330031, China; Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, Nanchang, 330031, China; Corresponding author. College of Chemistry, Nanchang University, Nanchang, 330031, China.

Journal volume & issue: Vol. 1, no. 4
p. 100059

Abstract

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Organic solar cells based on narrow bandgap small-molecule acceptors (SMAs) with highly crystalline characteristics have attracted great attentions for their superiority in obtaining high photovoltaic efficiency. Employing highly crystalline SMAs to enhance power conversion efficiencies (PCEs) by regulating and controlling morphology and compatibility of donor and acceptor materials has turned out to be an effective approach. In this study, we synthesized three different crystalline SMAs by using fluorine substitution on alkoxyphenyl conjugated side chains to modulate the relationship of crystallinity and morphologies, namely ZY1 (zero F atoms), ZY2 (two F atoms), and ZY3 (four F atoms). The three SMAs show the broad absorption edges and similar frontier orbital energy levels, generating the analogical (over 0.9 V) open circuit voltage (VOC) of the polymer solar cells (PSCs). As a result, the PM6:ZY2-based PSCs yield a PCE of 10.81% with a VOC of 0.95 V, a short-circuit current density (JSC) of 16.154 mA cm−2, and a fill factor (FF) of 0.71, which is higher than that of 9.17% (PM6:ZY1) and 6.37% (PM6:ZY3). And the PCE (17.23%) of the PM6:Y6:ZY2 based ternary PSCs is also higher than that of 16.32% PM6:Y6 based binary device. Obviously, the results demonstrate that adding fluorine atoms on the conjugated side chains to construct high crystalline materials is a positive strategy to effectively increase the efficiencies of binary and ternary PSCs.

Published in Materials Reports: Energy

ISSN: 2666-9358 (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.keaipublishing.com/en/journals/materials-reports-energy/

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