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

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 

机构地区：[1]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 [2]Department of Chemical Engineering,Pohang University of Science and Technology,Pohang 37673,South Korea [3]College of New Materials and New Energies,Shenzhen Technology University,Shenzhen 518118,People’s Republic of China [4]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 [5]State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures,Nanning 530004,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第3期376-388,共13页纳微快报（英文版）

基　　金：support from the National Natural Science Foundation of China(62275057);the Guangxi Natural Science Foundation(2023GXNSFFA026004 and 2022GXNSFDA035066);the Innovation Project of Guangxi Graduate Education(YCBZ2024034);Natural Science Foundation of Ningbo under grant(2022J149);Natural Science Foundation of Ningbo under grant(2022A-230-G)

摘　　要：Trap-assisted charge recombination is one of the primary limitationsof restricting the performance of organic solar cells. However, effectivelyreducing the presence of traps in the photoactive layer remains challenging.Herein, wide bandgap polymer donor PTzBI-dF is demonstrated as an effectivemodulator for enhancing the crystallinity of the bulk heterojunction active layerscomposed of D18 derivatives blended with Y6, leading to dense and orderedmolecular packings, and thus, improves photoluminescence quenching properties.As a result, the photovoltaic devices exhibit reduced trap-assisted charge recombinationlosses, achieving an optimized power conversion efficiency of over 19%.Besides the efficiency enhancement, the devices comprised of PTzBI-dF as athird component simultaneously attain decreased current leakage, improved chargecarrier mobilities, and suppressed bimolecular charge recombination, leading toreduced energy losses. The advanced crystalline structures induced by PTzBI-dFand its characteristics, such as well-aligned energy level, and complementaryabsorption 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, providingguidelines for designing effective morphology modulators for high-performance organic solar cells.

关 键 词：Trap-assisted charge recombination PHOTOLUMINESCENCE MISCIBILITY Current leakage Power conversion efficiency 

分 类 号：TM914.4[电气工程—电力电子与电力传动]