Solvent-modulated reaction between mesoporous PbI 2 film and CH 3 NH 3 I for enhancement of photovoltaic performances of perovskite solar cells

Zai wen Kwang, Chih Wen Chang, Tsung Yu Hsieh, Tzu Chien Wei, Shih Yuan Lu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Solvent engineering with dimethylsulfoxide (DMSO) has been shown to achieve high quality methylammonium lead iodide (MAPbI 3 ) films for high performance perovskite solar cells (PSC). The morphology and composition of the intermediate PbI 2 -DMSO films play the key role for the success. The coordination and crystal growth of the PbI 2 –DMSO film however remain un-exploited. We study the way and extent of DMSO coordination and subsequent crystal growth of the PbI 2 -DMSO film to fabricate high quality perovskite films for enhancement of the photovoltaic performances of the cells. The DMSO is pre-coordinated or coordinated in-situ with PbI 2 at a 1:1 or 2:1 M ratio. The PbI 2 -DMSO film from pre-coordination at 1:1 M ratio gives perovskite films of the best quality, being dense and possessing uniform size grains, high light absorption, and long charge carrier life times, among all investigated. The champion PSC achieves a high power conversion efficiency of 15.2%, significantly outperforming 13.0% of PSC based on PbI 2 -DMSO films from in-situ coordination at 1:1 M ratio, and 11.7% of PSC based on plain PbI 2 films.

Original languageEnglish
Pages (from-to)118-129
Number of pages12
JournalElectrochimica Acta
Volume266
DOIs
Publication statusPublished - Mar 10 2018
Externally publishedYes

Keywords

  • DMSO coordination
  • Mesoporous PbI2
  • Perovskite solar cell
  • Solvent engineering

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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