The effects of end-capped modifications of a polymer donor with high molecular weight on non-fullerene solar cells are largely ignored,even if the chain-end-functionalized method of conjugated polymers is an effective strategy in modulating polymeric optical-electronic properties.In this study,we design and synthesize an end-capped polymer,PM6TPO,via a reaction with the parent polymer PM6.Meanwhile,the conventional detection methods of X-ray photoelectron spectroscopy(XPS),matrix-assisted laser desorption/ionization time-of-flight(MALDI-TOF),and1H nuclear magnetic resonance(1H NMR)were replaced by simple solution-based inductively coupled plasma-mass spectrometry(ICP-MS)to evaluate the end-capped efficacy of PM6TPO.By introducing end-capped groups on a high molecular weight polymer donor,we could finely tune the aggregated behavior,strengthen the miscibility between the donor and acceptor without sacrificing the strong aggregated properties,and reduce the non-radiative recombination with a lower energy loss.Therefore,the PM6TPO-based organic solar cell(OSC)realized a higher open-circuit voltage of 0.843 V and PCE of 17.26％than that of the non-end-capped parent polymer,PM6(0.824 V and 16.21％,respectively).This work not only provides a straightforward method for verifying the end-capped efficacy of a high molecular weight polymer but also indicates a new research direction for improving the photovoltaic performance of non-fullerene-based solar cells.

Bing Zheng;Yuchen Yue;Jianling Ni;Rui Sun;Jie Min;Jingxia Wang;Lei Jiang;Lijun Huo

School of Chemistry,Beihang University,Beijing 100191,China;Key Laboratory of Bioinspired Smart Interfacial Science,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China;The Institute for Advanced Studies,Wuhan University,Wuhan 430072,China

中国科学:化学（英文版）

[1]Bing Zheng;Yuchen Yue;Jianling Ni;Rui Sun;Jie Min;Jingxia Wang;Lei Jiang;Lijun Huo-.An end-capped strategy for crystalline polymer donor to improve the photovoltaic performance of non-fullerene solar cells)[J].中国科学:化学（英文版）,2022(05):964-972

PM6TPO,and1H

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