journal article·2022-07-08

Effects of Oxygen Position in the Alkoxy Substituents on the Photovoltaic Performance of A-DA′D-A Type Pentacyclic Small Molecule Acceptors

Qingya Wei, Songting Liang, Wei Liu, Yunbin Hu, Beibei Qiu, Jie Ren, Jun Yuan, Fei Huang, Yingping Zou, Yongfang Li

ACS Energy Letters· Volume 7· Issue 7
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Abstract

In this work, we explore the reason that the alkoxy substituent on the terminal thiophene in a fused DA′D unit results in an abnormal blue-shifted absorption of A-DA′D-A type small molecule acceptors (SMAs), and we further propose a simple molecular strategy of altering the oxygen position along the alkoxy side chains to fine-tune the optoelectronic properties. By replacing the n-hexyl side chains of our previously reported pentacyclic acceptor Y26 (BZ4F) with hexyoxyl groups and moving the oxygen atom to the second and third positions along the alkoxy chains, we synthesize BZ4F-O-1, BZ4F-O-2, and BZ4F-O-3. BZ4F-O-1 shows blue-shifted absorption, while BZ4F-O-2 and BZ4F-O-3 exhibit red-shifted absorption. Using PM6 as the polymer donor, the BZ4F-O-3 based device achieves a favorable efficiency of 14.69%. This is the first work to study the effects of the oxygen position along the alkoxy side chains on the photovoltaic performance of the A-DA′′D-A type SMAs, which can provide important guidance toward future molecular design.
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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

State Key Laboratory of Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province, College of Physics and Electronic Information Engineering, Zhejiang Normal University, Jinhua, Zhejiang 321004, China

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, International Research Center for X Polymers, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China

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

Funding

National Natural Science Foundation of China

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