Ultrasonic Spray-Coated Mixed Cation Perovskite Films and Solar Cells

Yi Shang Chou, Li Hui Chou, An Zhe Guo, Xiao Feng Wang, Itaru Osaka, Chun Guey Wu, Cheng Liang Liu

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

A solar absorber composed of mixed cation perovskite films containing methylammonium (MA) and formamidinium (FA) lead triiodide (MA1-xFAxPbI3) was prepared by continuous ultrasonic spray-coating. This process combined features of substitutional modifications in perovskites and simple yet versatile processing to realize scalable fabrication. Herein, simultaneous growth from a precursor solution with controlled MA/FA stoichiometry in the inverted perovskite solar cells based on MA1-xFAxPbI3 was systematically investigated to link the thin film quality, optical properties, and crystal structures with photovoltaic performance. The result of the inherent advantages of increased photoabsorption, better film quality, and enhanced crystallinity, the perovskite solar cell composed of the MA0.75FA0.25PbI3 (x = 0.25) perovskite achieved an optimum power conversion efficiency (PCE) as high as 15.61% and an average PCE of 15.15 ± 0.45%. In particular, the spray-deposited MA0.75FA0.25PbI3 unencapsulated cells exhibited almost no hysteresis in the current density-voltage (J-V) curve and excellent long-term stability under ambient conditions (25 °C, 30-40% relative humidity). These results highlight the importance of choosing a suitable mixed cation perovskite composition and scalable spraying technique for high-throughput manufacturing of perovskite solar cells to prolong device lifetime and achieve good reproducibility.

Original languageEnglish
Pages (from-to)14217-14224
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number16
DOIs
StatePublished - 19 Aug 2019

Keywords

  • High throughput
  • Mixed cations
  • Perovskite
  • Solar cells
  • Spray-coating

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