Alkali Metal Doping for Improved CH3NH3PbI3 Perovskite Solar Cells

Wangen Zhao, Zhun Yao, Fengyang Yu, Dong Yang, Shengzhong Frank Liu

Research output: Contribution to journalArticle

80 Scopus citations

Abstract

Organic–inorganic hybrid halide perovskites are proven to be a promising semiconductor material as the absorber layer of solar cells. However, the perovskite films always suffer from nonuniform coverage or high trap state density due to the polycrystalline characteristics, which degrade the photoelectric properties of thin films. Herein, the alkali metal ions which are stable against oxidation and reduction are used in the perovskite precursor solution to induce the process of crystallization and nucleation, then affect the properties of the perovskite film. It is found that the addition of the alkali metal ions clearly improves the quality of perovskite film: enlarges the grain sizes, reduces the defect state density, passivates the grain boundaries, increases the built-in potential (V bi), resulting to the enhancement in the power conversion efficiency of perovskite thin film solar cell.

Original languageEnglish (US)
Article number1700131
JournalAdvanced Science
Volume5
Issue number2
DOIs
StatePublished - Feb 2018

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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