Impact of alloy‐like phase on energy loss mitigation in multi‐component organic photovoltaics

Author:

Kong Xiangyue1,Zhan Lingling1ORCID,Li Zhongjie1,Yang Yaxin1,Liu Yuhao1,Qiu Huayu1,Sun Xiaokang2,Hu Hanlin1,Sun Rui3ORCID,Min Jie3ORCID,Yin Shouchun1ORCID,Fu Weifei4ORCID,Chen Hongzheng4

Affiliation:

1. Key Laboratory of Organosilicon Chemistry and Materials Technology of Ministry of Education College of Materials, Chemistry and Chemical Engineering Hangzhou Normal University Hangzhou P. R. China

2. Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University Shenzhen P. R. China

3. The Institute for Advanced Studies Wuhan University Wuhan P. R. China

4. State Key Laboratory of Silicon and Advanced Semiconductor Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou P. R. China

Abstract

AbstractThe multi‐component strategy has proven effective in advancing the performance of organic photovoltaics (OPVs), enhancing photocurrent and fill factor through spectral complementarity and morphology optimization. However, the open‐circuit voltage (VOC) mechanism in multi‐component systems lacks systematic investigation. In this study, we explore the influence of alloy‐like phases on energy level distribution and energy loss mechanisms in multi‐component OPVs. Appropriate modulation of donor alloy‐like phases maintains the original intermolecular stacking, enhances component compatibility, reduces acceptor aggregation, and improves acceptor phase purity, mitigating non‐radiative recombination losses. Additionally, suitable alloy‐like phase modulation elevates charge transfer (CT) states, reducing the gap between CT and local exciton state, lowering reorganization energy, and alleviating radiative recombination loss below the bandgap. Through synergistic optimization (layer‐by‐layer method with solid additive), ternary devices based on Y6 acceptor achieve a notable 19.41% power conversion efficiency, offering new insights for the analysis of the energy loss of the multi‐component OPVs.

Funder

Natural Science Foundation of Zhejiang Province

National Natural Science Foundation of China

Hangzhou Normal University

National Key Research and Development Program of China

Publisher

Wiley

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