Dual-Donor-Induced Crystallinity Modulation Enables 19.23％ Efficiency Organic Solar Cells

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外文摘要：Trap-assisted charge recombination is one of the primary limita-tions of restricting the performance of organic solar cells.However,effectively reducing the presence of traps in the photoactive layer remains challenging.Herein,wide bandgap polymer donor PTzBI-dF is demonstrated as an effective modulator for enhancing the crystallinity of the bulk heterojunction active lay-ers composed of D18 derivatives blended with Y6,leading to dense and ordered molecular packings,and thus,improves photoluminescence quenching properties.As a result,the photovoltaic devices exhibit reduced trap-assisted charge recom-bination losses,achieving an optimized power conversion efficiency of over 19％.Besides the efficiency enhancement,the devices comprised of PTzBI-dF as a third component simultaneously attain decreased current leakage,improved charge carrier mobilities,and suppressed bimolecular charge recombination,leading to reduced energy losses.The advanced crystalline structures induced by PTzBI-dF and its characteristics,such as well-aligned energy level,and complementary absorption spectra,are ascribed to the promising performance improvements.Our findings suggest that donor phase engineering is a feasible approach to tuning the molecular packings in the active layer,providing guidelines for designing effective morphology modulators for high-performance organic solar cells.

外文关键词：

Trap-assisted charge recombinationPhotoluminescenceMiscibilityCurrent leakagePower conversion efficiency

作者：

Anhai Liang、Yuqing Sun、Sein Chung、Jiyeong Shin、Kangbo Sun、Chaofeng Zhu、Jingjing Zhao、Zhenmin Zhao、Yufei Zhong、Guangye Zhang、Kilwon Cho、Zhipeng Kan

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作者单位：

Center On Nanoenergy Research,Institute of Science and Technology for Carbon Peak & Neutrality,School of Physical Science & Technology,Guangxi University,Nanning 530004,People's Republic of China

Department of Chemical Engineering,Pohang University of Science and Technology,Pohang 37673,South Korea

College of New Materials and New Energies,Shenzhen Technology University,Shenzhen 518118,People's Republic of China

Zhejiang Engineering Research Center for Fabrication and Application of Advanced Photovoltaic Materials,School of Materials Science and Engineering,NingboTech University,Ningbo 315100,People's Republic of China

State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures,Nanning 530004,People's Republic of China

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出版年：

2025

DOI：

10.1007/s40820-024-01576-1

纳微快报(英文)

上海交通大学

纳微快报(英文)

ISSN：2311-6706

年,卷(期)：2025.17(3)