Suppression of charge carrier recombination in lead-free tin halide perovskite via lewis base post-treatment

Muhammad Akmal Kamarudin, Daisuke Hirotani, Zhen Wang, Kengo Hamada, Kohei Nishimura, Qing Shen, Taro Toyoda, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Lead-free tin perovskite solar cells (PSCs) show the most promise to replace the more toxic lead-based perovskite solar cells. However, the efficiency is significantly less than that of lead-based PSCs as a result of low open-circuit voltage. This is due to the tendency of Sn2+ to oxidize into Sn4+ in the presence of air together with the formation of defects and traps caused by the fast crystallization of tin perovskite materials. Here, post-treatment of the tin perovskite layer with edamine Lewis base to suppress the recombination reaction in tin halide PSCs results in efficiencies higher than 10%, which is the highest reported efficiency to date for pure tin halide PSCs. The X-ray photoelectron spectroscopy data suggest that the recombination reaction originates from the nonstoichiometric Sn:I ratio rather than the Sn4+:Sn2+ ratio. The amine group in edamine bonded the undercoordinated tin, passivating the dangling bonds and defects, resulting in suppressed charge carrier recombination.

Original languageEnglish
Pages (from-to)5277-5283
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume10
Issue number17
DOIs
Publication statusPublished - Sep 5 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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