journal article·2023-06-09

A-DA′D-A Type Acceptor with a Benzoselenadiazole A′-Unit Enables Efficient Organic Solar Cells

Zechen Li, Xiaojun Li, Jingwei Xue, Jinyuan Zhang, Can Zhu, Jing Li, Wei Ma, Lei Meng, Yongfang Li

ACS Energy Letters· Volume 8· Issue 6
Publisher page

Abstract

A new A-DA′D-A structured narrow bandgap small molecular acceptor (SMA) Se46 was designed and synthesized by using benzoselenadiazole as the A′ unit and branched 2-butyloctyl as upper side chains in its DA′D central fused ring. It was found that Se46 shows red-shifted absorption compared to that of L8-BO with a benzothiadiazole A′ unit and an up-shifted lowest unoccupied molecular orbital energy level compared to that of Y6 with a benzothiadiazole A′ unit and linear n -C 11 H 23 upper side chains. The organic solar cells (OSCs) based on PM6:Se46 demonstrate a high power conversion efficiency over 18% with an increased short circuit current density compared to that of the L8-BO-based devices and a higher open circuit voltage than that of the Y6-based devices. The results indicate that the synergetic modification of selenium substitution in the A′ unit and branched alkyl upper side chain is an effective strategy to further promote photovoltaic performance for the narrow bandgap A-DA′D-A type acceptors.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

School of Chemical Science, University of Chinese Academy of Science, Beijing 100049, P. R. China

State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. China

Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Basic and Applied Basic Research Major Program of Guangdong Province

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