Enhancing Electroluminescence of Medium‐Gap Organic Photovoltaic Cells Through the Incorporation of Pyrrole Rings in Acceptors

Author:

Wang Wenxuan12,Wang Jingwen12,Cui Yong1ORCID,Li Zi1,Wang Jianqiu1,Wang Chaoyi3,Chen Zhihao1,Qiao Jiawei4,Hao Xiaotao4,Hou Jianhui123ORCID

Affiliation:

1. State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

2. University of Chinese Academy of Sciences Beijing 100049 China

3. School of Chemistry and Biology Engineering University of Science and Technology Beijing Beijing 100083 China

4. School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Abstract

AbstractHigh electroluminescence of acceptors can effectively decrease nonradiative energy losses and improve the performance of organic photovoltaic (OPV) cells. Pyrrole ring is a promising building block to enhance the electroluminescence of acceptors, while pyrrole‐based acceptors with medium bandgap are rarely reported. Here, two medium‐gap acceptors named FICC‐EH and FICC‐BO are synthesized. Both acceptors exhibit strong electroluminescence properties, giving satisfying quantum efficiency (QE) of 0.1% in organic light‐emitting diodes (OLEDs). Moreover, PBQx‐TF:FICC‐BO presents a longer film formation process due to the longer alkyl chains. This contributes to more distinct fibril‐network morphology and ordered molecular stacking, thus increasing carrier mobility and suppressing charge recombination. Consequently, benefiting from decreased energy losses, PBQx‐TF:FICC‐BO‐based OPV cells reach a PCE of 12.0% with a VOC of 1.04 V under AM 1.5G and achieve a PCE of 25.4% under 1000 lux LED. This work demonstrates the potential of pyrrole for constructing medium‐gap acceptors with strong electroluminescence for photovoltaic applications.

Funder

National Natural Science Foundation of China

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Publisher

Wiley

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