Effect of Solvent Residue in the Thin-Film Fabrication on Perovskite Solar Cell Performance

Yawei Zhou, Adel Najar, Jing Zhang, Jiangshan Feng, Yang Cao, Zhigang Li, Xuejie Zhu, Dong Yang, Shengzhong Frank Liu

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Organic-inorganic Pb-based halide perovskite photoelectrical materials, especially perovskite solar cells (PSCs), have attracted attention due to the significant efforts in improving the power conversion efficiency (PCE) to above 25%. However, the stability issue of the PSCs restricts their further development for commercialization. Strategies are designed to keep moisture and oxygen out of the perovskite films, such as additive, surface passivation, and solvent engineering; however, usually, the corrosion of active films by the residual solvent is mostly ignored. Solvent residue is the paramount factor influencing the stability of the perovskite film prepared by the solution method, and most solvents can be easily absorbed and accelerate the perovskite film decomposition. Here, we studied the residual solvent effect on two kinds of perovskite films obtained by different annealing processes: hot air annealing and hot bench annealing. Several detection techniques were used to study the performance of two different annealing methods, including time-of-flight secondary ion mass spectrometry (ToF-SIMS), thermogravimetric analysis (TGA), and field-emission scanning electron microscopy (FESEM). The perovskite film obtained by hot air annealing shows less residual solvent and better device performance than the hot bench annealing method. This method is expected to provide insight into reducing solvent residue to improve the stability of the PSCs, especially for future commercialization.

Original languageEnglish
Pages (from-to)28729-28737
Number of pages9
JournalACS Applied Materials and Interfaces
Volume14
Issue number25
DOIs
Publication statusPublished - Jun 29 2022

Keywords

  • annealing
  • hot air
  • hot bench
  • perovskite solar cell
  • solvent residue
  • thin film

ASJC Scopus subject areas

  • General Materials Science

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