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

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• 作者：Dowon Bae ; Axel Palmstrom ; Katherine Roelofs ; Bastian Mei ; Ib Chorkendorff ; Stacey F. Bent ; Peter C.K. Vesborg
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 15, 2016
• 年：2016
• 卷：8
• 期：23
• 页码：14301-14306
• 全文大小：461K
• 年卷期：0
• ISSN：1944-8252

文摘

Wide-band-gap mixed-halide CH₃NH₃PbI_3–XBr_X-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.