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Highly π-extended copolymer as additive-free hole-transport material for perovskite solar cells

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Abstract

Organolead halide perovskite solar cells have achieved a certified power-conversion efficiency (PCE) of 22.1% and are thus among the most promising candidates for next-generation photovoltaic devices. To date, most high-efficiency perovskite solar cells have employed arylamine-based hole-transport materials (HTMs), which are expensive and have a low mobility. The complicated doping procedures and the potentially stability-adverse dopants used in these HTMs are among the major bottlenecks for the commercialization of perovskite solar cells (PSCs). Herein, we present a polythiophene-based copolymer (PDVT-10) with a hole mobility up to 8.2 cm2·V−1·s−1 and a highest occupied molecular orbital level of −5.28 eV as a hole-transport layer (HTL) for a PSC. A device based on this new HTM exhibited a high PCE of 13.4% under 100 mW·cm−2 illumination, which is one of the highest PCEs reported for the dopant-free polymer-based HTLs. Moreover, PDVT-10 exhibited good solution processability, decent air stability, and thermal stability, making it a promising candidate as an HTM for PSCs.

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Acknowledgements

This work was supported by the National Basic Research Program of China (No. 2015CB932302), the National Natural Science Foundation of China (Nos. 21573249 and 21474116), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Nos. XDB12020100 and XDB12030100).

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Authors and Affiliations

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

    Jie Liu, Qianqing Ge, Weifeng Zhang, Jingyuan Ma, Jie Ding, Gui Yu & Jinsong Hu

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jie Liu, Qianqing Ge, Weifeng Zhang, Jingyuan Ma, Jie Ding, Gui Yu & Jinsong Hu

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  1. Jie Liu
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  2. Qianqing Ge
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Correspondence to Gui Yu or Jinsong Hu.

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Liu, J., Ge, Q., Zhang, W. et al. Highly π-extended copolymer as additive-free hole-transport material for perovskite solar cells. Nano Res. 11, 185–194 (2018). https://doi.org/10.1007/s12274-017-1618-z

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