Simple Non-Fused Electron Acceptors Leading to Efficient Organic Photovoltaics

Tian-Jiao Wen; Zhi-Xi Liu; Zeng Chen; Jiadong Zhou; Ziqiu Shen; Yiqun Xiao; Xinhui Lu; Zengqi Xie; Haiming Zhu; Chang-Zhi Li; Hongzheng Chen

doi:10.1002/anie.202101867

Simple Non-Fused Electron Acceptors Leading to Efficient Organic Photovoltaics

Angew Chem Int Ed Engl. 2021 Jun 1;60(23):12964-12970. doi: 10.1002/anie.202101867. Epub 2021 May 6.

Authors

Tian-Jiao Wen¹, Zhi-Xi Liu¹, Zeng Chen², Jiadong Zhou³, Ziqiu Shen¹, Yiqun Xiao⁴, Xinhui Lu⁴, Zengqi Xie³, Haiming Zhu², Chang-Zhi Li¹, Hongzheng Chen¹

Affiliations

¹ MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
² Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
³ 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.
⁴ Department of Physics, The Chinese University of Hong Kong, New Territories, Hong Kong, 999077, P. R. China.

PMID: 33797187
DOI: 10.1002/anie.202101867

Abstract

Despite the remarkable progress achieved in recent years, organic photovoltaics (OPVs) still need work to approach the delicate balance between efficiency, stability, and cost. Herein, two fully non-fused electron acceptors, PTB4F and PTB4Cl, are developed via a two-step synthesis from single aromatic units. The introduction of a two-dimensional chain and halogenated terminals for these non-fused acceptors plays a synergistic role in optimizing their solid stacking and orientation, thus promoting an elongated exciton lifetime and fast charge-transfer rate in bulk heterojunction blends. As a result, PTB4Cl, upon blending with PBDB-TF polymer, has enabled single-junction OPVs with power conversion efficiencies of 12.76 %, representing the highest values among the reported fully unfused electron acceptors so far.

Keywords: energy conversion; non-fused-ring acceptors; organic photovoltaics; solar cells.

Abstract

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