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 journalArticleAcademicpeer-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 & interfaces
Issue number23
Publication statusPublished - 15 Jun 2016
Externally publishedYes


  • Lead-halide
  • Multistep deposition
  • Organic-inorganic hybrids
  • Photovoltaics
  • Spin-coating
  • n/a OA procedure


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