Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.032
Publication date: 27th October 2017
Recently, organo-lead-halide perovskite solar cells have attracted growing and widely attention due to their remarkable photoelectric properties, low cost and ease of fabrication. However, the development of perovskite solar cells is still limited by several factors like strict fabrication conditions, low stability, small active area and poor reproducibility. We argue that the nature of perovskite film formation is a process of a series of chemical reactions and the crystallization, where the Pb(II) coordination chemistry involves in. We thus set out to study the perovskite film formation process from the view of Pb(II) coordination chemistry. In this study, the formation process of the perovskite films were examined in situ using microscope and powder XRD techniques. Four intermediates were identified and structurally characterized using single crystal X-ray crystallography. The intermediates were characterized by XRD, UV-Vis, IR and TGA/DSC. The film formation mechanisms from the different precursors, such as PbCl3/MAI (1:3), PbI2/MAI (1:1 and 1:3) and PbBr2/MAI (1:3) were proposed.
Key Words: solar cell, perovskite, mechanism, intermediate, crystal structure, solvent engineering
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