Ethynyl-linked perylene bisimide based electron acceptors for non-fullerene organic solar cells |
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Authors: | Changshi Yu Yunhua Xu Shijie Liang Xudong Jiang Guitao Feng Cheng Li Weiwei Li |
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Institution: | a Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China;
b Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | In this work, star-shaped perylene bisimide (PBI) derivatives with spiro-aromatic cores linked with ethynyl units were developed as electron acceptors for non-fullerene organic solar cells. The ethynyl linkers were found to enhance the planarity of the conjugated backbone, resulting in high electron mobilities and near-infrared absorption. The ethynyl-linked PBI acceptors showed high power conversion efficiencies (PCEs) up to 4.27% due to the high short-circuit current density (Jsc) of 8.52 mA/cm2 and fill factor (FF) of 0.59, while the PBI acceptor without ethynyl units provided a low PCE of 3.57% in non-fullerene solar cells. The results demonstrate that ethynyl units can be applied into designing new PBI electron acceptors with improved charge transport properties and photovoltaic performance. |
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Keywords: | Electron acceptor Non-fullerene organic solar cells Perylene bisimide Charge transport Ethynyl |
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