Improving efficiency of planar hybrid CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3-x</inf>Cl<inf>x</inf> perovskite solar cells by isopropanol solvent treatment

  • Wang X
  • Li X
  • Tang G
 et al. 
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Abstract

Hybrid organic/inorganic perovskite planar heterojunction (PHJ) solar cells are becoming one of the most competitive emerging technologies. Here, the devices (ITO/PEDOT:PSS/CH3NH3PbI3-xClx/PC60BM/C60/Al) are fabricated based on solution process. A power conversion efficiency (PCE) up to 13.1% was obtained after isopropanol (IPA) solvent treatment, which was 9% improvement than that of the original devices. Photocurrent hysteresis could be reduced to a certain extent by introducing IPA treatment. Solvent treatment can remove as-grown impurities like CH3NH3I and defects formed during the device fabrication. We also demonstrated the electrical and optical properties of perovskite films were improved. The addition of IPA-treated facilitates the formation of a relatively smooth PC60BM films. This work provides a very simple but effective strategy to enhance the power conversion efficiency of perovskite solar cells.

Author-supplied keywords

  • Isopropanol
  • Perovskite solar cells
  • Planar heterojunction
  • Solvent treatment

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Authors

  • Xueyan Wang

  • Xiaodong Li

  • Gang Tang

  • Lixiao Zhao

  • Wenjun Zhang

  • Tonggang Jiu

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