Solvent engineering based on triethylenetetramine (TETA) for perovskite solar cells processed in ambient-air

N. Timasi, S. Tafazoli, E. Nouri, M. R. Mohammadi (Lead / Corresponding author), Y. Li

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Solvent engineering as a crucial factor in determining the photovoltaic performance of perovskite solar cells has attracted much attention in recent years. Herein, we treat PbI 2 and perovskite films with isopropyl alcohol, acetone, diethyl ether and dichloromethane, as standard solvents, in a modified two-step method. Meanwhile, triethylenetetramine (TETA) is introduced as a new reagent in solvent engineering for perovskite solar cell devices. Structural, optical and photovoltaic characteristics of the TETA-treated perovskite films are compared with those of the ones treated with different solvents. A shiny, pinhole-free and full-coverage texture with sufficiently large grain sizes is obtained in the presence of TETA, suggesting an efficient solvent engineering for perovskite layers. Moreover, the results reveal that residual PbI 2 is completely removed and converted to a crystalline perovskite film. Amongst the PSC devices engineered with various solvents, the TETA-treated film exhibits a 55% increase in photoconversion efficiency compared to the control device with no solvent engineering.

Original languageEnglish
Pages (from-to)1228-1234
Number of pages7
JournalPhotochemical and Photobiological Sciences
Volume18
Issue number5
Early online date28 Feb 2019
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • perovskite solar cells
  • hole-transporter free
  • fully-printable components

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