Alkali Metal Doping for Improved CH 3 NH 3 PbI 3 Perovskite Solar Cells

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

Research output: Contribution to journalArticle

48 Citations (Scopus)

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

Fingerprint

Alkali Metals
Alkali metals
Perovskite
alkali metals
solar cells
Doping (additives)
methylidyne
metal ions
Metal ions
perovskites
thin films
halides
Ions
absorbers
grain boundaries
Crystallization
grain size
Semiconductors
traps
nucleation

All Science Journal Classification (ASJC) codes

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

Cite this

Zhao, Wangen ; Yao, Zhun ; Yu, Fengyang ; Yang, Dong ; Liu, Shengzhong Frank. / Alkali Metal Doping for Improved CH 3 NH 3 PbI 3 Perovskite Solar Cells In: Advanced Science. 2018 ; Vol. 5, No. 2.
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Alkali Metal Doping for Improved CH 3 NH 3 PbI 3 Perovskite Solar Cells . / Zhao, Wangen; Yao, Zhun; Yu, Fengyang; Yang, Dong; Liu, Shengzhong Frank.

In: Advanced Science, Vol. 5, No. 2, 1700131, 02.2018.

Research output: Contribution to journalArticle

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AU - Zhao, Wangen

AU - Yao, Zhun

AU - Yu, Fengyang

AU - Yang, Dong

AU - Liu, Shengzhong Frank

PY - 2018/2

Y1 - 2018/2

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AB - 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.

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