Enhancing photovoltaic performance via aggregation dynamics control in fused‐ring electron acceptor
Jiayu Wang,
Runyu Zhu,
Shijie Wang,
Yawen Li,
Boyu Jia,
Jiadong Zhou,
Peiyao Xue,
Susanne Seibt,
Yuze Lin,
Zengqi Xie,
Wei Ma,
Xiaowei Zhan
Affiliations
Jiayu Wang
Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Beijing China
Runyu Zhu
Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Beijing China
Shijie Wang
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an China
Yawen Li
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids Institute of Chemistry, Chinese Academy of Sciences Beijing China
Boyu Jia
Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Beijing China
Jiadong Zhou
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou China
Peiyao Xue
Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Beijing China
Susanne Seibt
Australian Synchrotron Clayton Victoria Australia
Yuze Lin
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids Institute of Chemistry, Chinese Academy of Sciences Beijing China
Zengqi Xie
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou China
Wei Ma
State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an China
Xiaowei Zhan
Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Peking University Beijing China
Abstract A new fused‐ring electron acceptor FNIC3 with dynamics controlled aggregation behavior was synthesized. FNIC3 shows strong absorption in 600–900 nm, HOMO/LUMO energy levels of −5.59/−4.04 eV, and electron mobility of 1.2 × 10−3 cm2 V−1 s−1. The aggregation of FNIC3 shows strong dependency on film formation time. Prolongation of film formation time promotes the crystallization of FNIC3, leading to improved crystallinity and enlarged aggregate sizes. Aggregation of FNIC3 significantly influences the photovoltaic device parameters. Appropriate aggregation red‐shifts the absorption and improves the mobilities of the blend, which contributes to high photocurrent and fill factor thus high power conversion efficiency (PCE). Overaggregation leads to increased nonradiative energy loss and insufficient charge generation, resulting in decreased open‐circuit voltage and short‐circuit current density. The blends based on PM6:FNIC3 fabricated under proper film formation time exhibit a PCE of 12.3%, higher than those fabricated under short and long film formation time (10.0–10.5%).
