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Mixed-Halide CH3NH3PbI3−xXx (X=Cl, Br, I) perovskites: vapor-assisted solution deposition and application as solar cell absorbers

Sedighi, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/cphc.201600230
  3. Publisher: Wiley-VCH Verlag
  4. Abstract:
  5. There have been recent reports on the formation of single-halide perovskites, CH3NH3PbX3 (X=Cl, Br, I), by means of vapor-assisted solution processing. Herein, the successful formation of mixed-halide perovskites (CH3NH3PbI3−xXx) by means of a vapor-assisted solution method at ambient atmosphere is reported. The perovskite films are synthesized by exposing PbI2 film to CH3NH3X (X=I, Br, or Cl) vapor. The prepared perovskite films have uniform surfaces with good coverage, as confirmed by SEM images. The inclusion of chlorine and bromine into the structure leads to a lower temperature and shorter reaction time for optimum perovskite film formation. In the case of CH3NH3PbI3−xClx, the optimum reaction temperature is reduced to 100 °C, and the resulting phases are CH3NH3PbI3 (with trace Cl) and CH3NH3PbCl3 with a ratio of about 2:1. In the case of CH3NH3PbI3−xBrx, single-phase CH3NH3PbI2Br is formed in a considerably shorter reaction time than that of CH3NH3PbI3. The mesostructured perovskite solar cells based on CH3NH3PbI3 films show the best optimal power conversion efficiency of 13.5 %, whereas for CH3NH3PbI3−xClx and CH3NH3PbI3−xBrx the best recorded efficiencies are 11.6 and 10.5 %, respectively
  6. Keywords:
  7. Electrochemistry ; Perovskite phases ; Solar cells ; Thin films ; Vapor-assisted solution deposition
  8. Source: ChemPhysChem ; 2016 , Pages 2382-2388 ; 14394235 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/cphc.201600230/abstract