Highly Efficient and Stable CsPbTh3 (Th = I, Br, Cl) Perovskite Solar Cells by Combinational Passivation Strategy

Kang Wang, Simin Ma, Xiaoyang Xue, Tong Li, Simiao Sha, Xiaodong Ren, Jingru Zhang, Hui Lu, Jinfu Ma, Shengwei Guo, Yucheng Liu, Jiangshan Feng, Adel Najar, Shengzhong Liu

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The distorted lead iodide octahedra of all-inorganic perovskite based on triple halide-mixed CsPb(I2.85Br0.149Cl0.001) framework have made a tremendous breakthrough in its black phase stability and photovoltaic efficiency. However, their performance still suffers from severe ion migration, trap-induced nonradiative recombination, and black phase instability due to lower tolerance factor and high total energy. Here, a combinational passivation strategy to suppress ion migration and reduce traps both on the surface and in the bulk of the CsPhTh3 perovskite film is developed, resulting in improved power conversion efficiency (PCE) to as high as 19.37%. The involvement of guanidinium (GA) into the CsPhTh3 perovskite bulk film and glycocyamine (GCA) passivation on the perovskite surface and grain boundary synergistically enlarge the tolerance factor and suppress the trap state density. In addition, the acetate anion as a nucleating agent significantly improves the thermodynamic stability of GA-doped CsPbTh3 film through the slight distortion of PbI6 octahedra. The decreased nonradiative recombination loss translates to a high fill factor of 82.1% and open-circuit voltage (VOC) of 1.17 V. Furthermore, bare CsPbTh3 perovskite solar cells without any encapsulation retain 80% of its initial PCE value after being stored for one month under ambient conditions.

Original languageEnglish
Article number2105103
JournalAdvanced Science
Volume9
Issue number9
DOIs
Publication statusPublished - Mar 25 2022

Keywords

  • CsPbTh
  • combinational passivation
  • efficiency
  • solar cells
  • stability

ASJC Scopus subject areas

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

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