Tailoring Mixed-Halide, Wide-Gap Perovskites via Multistep Conversion Process

Dowon Bae, Axel Palmstrom, Katherine Roelofs, Bastian Mei, Ib Chorkendorff, Stacey F. Bent*, Peter C. K. Vesborg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Wide-band-gap mixed-halide CH3NH3PbI3-XBrX-based solar cells have been prepared by means of a sequential spin-coating process. The spin-rate for PbI2 as well as its repetitive deposition are important in determining the cross-sectional shape and surface morphology of perovskite, and, consequently, J-V performance. A perovskite solar cell converted from PbI2 with a dense bottom layer and porous top layer achieved higher device performance than those of analogue cells with a dense PbI2 top layer. This work demonstrates a facile way to control PbI2 film configuration and morphology simply by modification of spin-coating parameters without any additional chemical or thermal post-treatment.

Original languageEnglish
Pages (from-to)14301-14306
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number23
Early online date31 May 2016
Publication statusPublished - 15 Jun 2016


  • lead-halide
  • multistep deposition
  • organic-inorganic hybrids
  • photovoltaics
  • spin-coating

ASJC Scopus subject areas

  • Materials Science(all)


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