Influence of Cl Incorporation in Perovskite Precursor on the Crystal Growth and Storage Stability of Perovskite Solar Cells

Hui Zhang*, Yifan Lv, Jinpei Wang, Huili Ma, Zhengyi Sun, Wei Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Solar cells based on organic-inorganic hybrid lead-halide perovskites are very promising because of their high performance and solution process feasibility. Elemental engineering on perovskite composition is a facile path to obtain high-quality crystals for efficient and stable solar cells. It was found that partially substituting I - with Cl - in the perovskite precursor promoted crystal growth, with the grain size larger than the layer thickness, and facilitated the generation of a self-passivation layer of PbI 2 . Whereas the residual Cl - ions were suspected to diffuse to the hole-transport layer consisting of ubiquitously spiro-OMeTAD, the formation of highly bounded ionic pairing of Cl - with the oxidized state of spiro-OMeTAD led to insufficient charge extraction and severely reversible performance degradation. This issue was effectively alleviated upon Br - doping owing to the generation of Pb-Br bonds in the lattice that strengthened the phase stability by improving the binding energy between each unit. The binary halide (Br - /Cl - )-doped perovskites resulted in a champion power conversion efficiency of 20.2% with improved long-term storage stability.

Original languageEnglish (US)
Pages (from-to)6022-6030
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number6
DOIs
StatePublished - Feb 13 2019

Keywords

  • compositional engineering
  • grain boundaries
  • halide doping
  • non-radiative recombination
  • perovskite solar cells

ASJC Scopus subject areas

  • General Materials Science

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