Flattening Grain-Boundary Grooves for Perovskite Solar Cells with High Optomechanical Reliability

Mingwei Hao, Tianwei Duan, Zhiwei Ma, Ming-Gang Ju, Joseph A. Bennett, Tanghao Liu, Peijun Guo, Yuanyuan Zhou*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

11 Citations (Scopus)


Optomechanical reliability has emerged as an important criterion for evaluating the performance and commercialization potential of perovskite solar cells (PSCs) due to the mechanical-property mismatch of metal halide perovskites with other device layer. In this work, grain-boundary grooves, a rarely discussed film microstructural characteristic, are found to impart significant effects on the optomechanical reliability of perovskite–substrate heterointerfaces and thus PSC performance. By pre-burying iso-butylammonium chloride additive in the electron-transport layer (ETL), GB grooves (GBGs) are flattened and an optomechanically reliable perovskite heterointerface that resists photothermal fatigue is created. The improved mechanical integrity of the ETL–perovskite heterointerfaces also benefits the charge transport and chemical stability by facilitating carrier injection and reducing moisture or solvent trapping, respectively. Accordingly, high-performance PSCs which exhibit efficiency retentions of 94.8% under 440 h damp heat test (85% RH and 85 °C), and 93.0% under 2000 h continuous light soaking are achieved.
Original languageEnglish
Article number2211155
Number of pages9
JournalAdvanced Materials
Issue number15
Early online date23 Jan 2023
Publication statusPublished - 13 Apr 2023

Scopus Subject Areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)

User-Defined Keywords

  • grain-boundary grooves
  • interface modification
  • microstructural characteristics
  • optomechanical reliability
  • perovskite solar cells


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