Flattening Grain-Boundary Grooves for Perovskite Solar Cells with High Opto-Mechanical 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 journalArticlepeer-review

Abstract

Opto-mechanical 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 layers. In this work, grain-boundary groove, a rarely discussed film microstructural characteristics, is found to impart significant effects on the opto-mechanical reliability of perovskite-substrate heterointerfaces and thus PSC performance. By pre-burying iso-butylammonium chloride additive in the electron-transport layer, we flattened GB grooves and created an opto-mechanically reliable perovskite heterointerface that resists the photothermal fatigue. The improved mechanical integrity of ETL-perovskite heterointerfaces also benefits the charge transport and chemical stability by facilitating the carrier injection and reducing the moisture or solvent trapping, respectively. Accordingly, we achieved high-performance perovskite solar cells 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.
Original languageEnglish
Article number2211155
Number of pages28
JournalAdvanced Materials
DOIs
Publication statusE-pub ahead of print - 23 Jan 2023

User-Defined Keywords

  • perovskite solar cells
  • microstructural characteristics
  • grain boundary groove
  • opto-mechanical reliability
  • interface modification

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