19.3% Efficiency ternary organic solar cells enabled by the alkyl side-chain effect of guest non-fullerene acceptors

IF 10.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Science China Chemistry Pub Date : 2024-06-27 DOI:10.1007/s11426-024-2011-3

Hongqian Wang, Sijian Wu, Daobin Yang, Xueliang Yu, Shuncheng Yang, Pengfei Ding, Pengyu Yan, Zaifei Ma, Jianfeng Zhang, Ziyi Ge

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Abstract

The effect of side-chain engineering of conjugated molecules on the morphology and device performance in binary organic solar cells has been widely investigated. However, this relationship has hardly been studied in the guest components of ternary organic solar cells. In this study, a family of non-fullerene guest acceptors, namely XY-3, XY-5 and XY-7, with hydrogen substituent, straight and branched alkyl chains on the bithiophene units, respectively, were designed and synthesized to understand their effects on aggregation properties and device performance. The straight and branched alkyl chains on the bithiophene units result in sightly blue-shifted absorption compared to the hydrogen substituent and the XY-7 demonstrates the most appropriate phase separation scale and the most balanced charge transport. Consequently, the OSCs based on D18:eC9:XY-7 achieve a high short-circuit current density (J_SC) and fill factor (FF), while maintaining the enhancement of the open-circuit voltage (V_OC) achieving an efficiency of 19.32%, exceeding those of D18:eC9, D18:eC9:XY-3, D18:eC9:XY-5 (PCE:18.28%, 19.04%, 18.75%, respectively). These results highlight that the side-chain engineering of Y series non-fullerene acceptors as the guest acceptors has great potential in optimizing morphology properties and promoting photovoltaic performance.

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利用客体非富勒烯受体的烷基侧链效应实现 19.3% 效率的三元有机太阳能电池

共轭分子侧链工程对二元有机太阳能电池形态和器件性能的影响已得到广泛研究。然而，在三元有机太阳能电池的客体成分中几乎没有研究过这种关系。本研究设计并合成了一系列非富勒烯客体受体，即 XY-3、XY-5 和 XY-7，它们在噻吩单元上分别带有氢取代基、直链和支链烷基链，以了解它们对聚集特性和器件性能的影响。与氢取代基相比，双噻吩单元上的直链和支链烷基链会导致明显的蓝移吸收，而 XY-7 则显示出最合适的相分离尺度和最均衡的电荷传输。因此，基于 D18:eC9:XY-7 的 OSC 实现了较高的短路电流密度（JSC）和填充因子（FF），同时保持了开路电压（VOC）的增强，实现了 19.32% 的效率，超过了 D18:eC9、D18:eC9:XY-3 和 D18:eC9:XY-5（PCE：分别为 18.28%、19.04% 和 18.75%）。这些结果表明，以 Y 系列非富勒烯受体作为客体受体的侧链工程在优化形态特性和提高光伏性能方面具有巨大潜力。

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来源期刊

Science China Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

14.40

自引率

7.30%

发文量

3787

审稿时长

2.2 months

期刊介绍： Science China Chemistry, co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China and published by Science China Press, publishes high-quality original research in both basic and applied chemistry. Indexed by Science Citation Index, it is a premier academic journal in the field. Categories of articles include: Highlights. Brief summaries and scholarly comments on recent research achievements in any field of chemistry. Perspectives. Concise reports on thelatest chemistry trends of interest to scientists worldwide, including discussions of research breakthroughs and interpretations of important science and funding policies. Reviews. In-depth summaries of representative results and achievements of the past 5–10 years in selected topics based on or closely related to the research expertise of the authors, providing a thorough assessment of the significance, current status, and future research directions of the field.