Effect of Precursor Aging on Built-In Potential in Formamidinium-Based Perovskite Solar Cells

Linfeng Cai, Yiwen Wang, Ning Li, Ali Asgher Syed, Fu Rong ZHU*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Formamidinium-based perovskite with optimal bandgap and improved thermal stability is a promising active material for application in perovskite solar cells (PSCs). The hybrid precursor solutions, formed by adding various smaller cations, are often used for improving the phase stability in PSCs. Herein, research to understand the aging effect of a methylammonium- and bromine-free formamidinium precursor solution on the performance of FA0.85Cs0.1Rb0.05PbI3-based PSCs is reported. The results reveal that deterioration in the built-in potential in the PSCs is closely associated with the formation of the secondary phase in the FA0.85Cs0.1Rb0.05PbI3 active layer. The formation of the secondary phase in the active layer is related to the hydrolysis of the precursor solution. The suppression of the moisture encroachment greatly enhances the durability of the precursor solution and performance reproducibility of PSCs.

Original languageEnglish
Article number2000192
JournalEnergy Technology
Volume8
Issue number12
DOIs
Publication statusPublished - Dec 2020

Scopus Subject Areas

  • Energy(all)

User-Defined Keywords

  • built-in potentials
  • perovskite solar cells
  • precursor solution aging
  • secondary phases

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