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Recent advances in electron acceptors with ladder-type backbone for organic solar cells

Abstract

Ladder-type non-fullerene acceptors develop very rapidly since 2015 as they have tunable structure, broad absorption region and good morphology control. The power conversion efficiency (PCE) of non-fullerene organic solar cell (NF-OSC) increased from below 6% up to over 13%, and. In this review, we analyze the fundamental concepts of organic bulk heterojunction (BHJ) solar cells and different building blocks of non-fullerene acceptors to have an overview of high-performance photovoltaic materials. Meanwhile, we also discuss several design guidelines for the chemical construction and modification, which majorly focus on the backbone variation, side-chain engineering and end-cap group substitution. The PCE of several backbones, such as IDT, IDTT, BDCPDT etc. have successfully exceeded 10% PCE, which demonstrate great potential for future optimization. The side-chains can affect the intermolecular packing by forming a 3-D conformation along with the rigid backbones. The end-cap groups can regulate the electronic property of the acceptors directly, and provide the main electron-transport channel which influence frontier orbital properties. Although design principles and mechanistic understanding of ladder-type acceptors have been explored, there are also many opportunities and challenges of device mechanism and molecular optimization which need to have deep study and investigation. We hope this review could assist readers to better understand the design principles of high-performance photovoltaic materials, molecular design and structure-property relationship.

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Publication details

The article was received on 08 Jun 2018, accepted on 09 Aug 2018 and first published on 09 Aug 2018


Article type: Review Article
DOI: 10.1039/C8TA05440A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Recent advances in electron acceptors with ladder-type backbone for organic solar cells

    Z. Jiang, T. Wang, F. Wu, J. Lin and L. Liao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA05440A

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