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

Dowon Bae, Axel Palmstrom, Katherine Roelofs, Bastian Timo Mei, Ib Chorkendorff, Stacey F. Bent, Peter Christian Kjærgaard Vesborg

Research output: Contribution to journalJournal articleResearchpeer-review


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
JournalA C S Applied Materials and Interfaces
Issue number23
Pages (from-to)14301–14306
Publication statusPublished - 2016


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