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Facile preparation of organometallic perovskite films and high-efficiency solar cells using solid-state chemistry

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Abstract

The power conversion efficiency of organometallic perovskite-based solar cells has skyrocketed in recent years. Intensive efforts have been made to prepare high-quality perovskite films tailored to various device configurations. Planar heterojunction devices have achieved record efficiencies; however, the preparation of perovskite films for planar junction devices requires the use of expensive vacuum facilities and/or the fine control of experimental conditions. Here, we demonstrate a facile preparation of perovskite films using solid-state chemistry. Solid-state precursor thin films of CH3NH3I and PbI2 are brought into contact with each other and allowed to react via thermally accelerated diffusion. The resulting perovskite film displays good optical absorption and a smooth morphology. Solar cells based on these films show an average efficiency of 8.7% and a maximum efficiency of 10%. The solid-state synthesis of organometallic perovskite can also be carried out on flexible plastic substrates. Using this method on a PET/ITO substrate produces devices with an efficiency of 3.2%. Unlike existing synthetic methods for organometallic perovskite films, the solid-state reaction method does not require the use of orthogonal solvents or careful adjustment of reaction conditions, and thus shows good potential for mass production in the future.

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Authors and Affiliations

  1. Department of Chemistry, Shanghai University, Shanghai, 200444, China

    Lei Chen & Weiguo Cao

  2. i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, Jiangsu, 215123, China

    Lei Chen, Feng Tang, Yixin Wang, Shan Gao, Jinhua Cai & Liwei Chen

  3. Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, Jiangsu, 215123, China

    Yixin Wang

Authors
  1. Lei Chen
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  2. Feng Tang
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  3. Yixin Wang
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  4. Shan Gao
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  5. Weiguo Cao
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  6. Jinhua Cai
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  7. Liwei Chen
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Correspondence to Jinhua Cai or Liwei Chen.

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These authors contributed equally to this work.

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Chen, L., Tang, F., Wang, Y. et al. Facile preparation of organometallic perovskite films and high-efficiency solar cells using solid-state chemistry. Nano Res. 8, 263–270 (2015). https://doi.org/10.1007/s12274-014-0662-1

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  • DOI: https://doi.org/10.1007/s12274-014-0662-1

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