Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Organic/inorganic hybrid solar cells with the organo-metal halide perovskite, CH3NH3MClxI3-x, have been widely studied as the next-generation organic photovoltaic. In this study, the influence of chloride ion on the crystal growth of the lead halide perovskite was investigated toward the realization of efficient and stable hybrid solar cells. The surface morphology and crystallinitydepending on the ratio of chloride in the lead halide perovskite solution were determined by SEM and XRD, respectively. The perovskite growth without chloride in the solution was less than 10 seconds, whereas the growth of the perovskite with the chloride in the solution takes a longer time of over 5 minutes. The quick growth is not preferable to achieve a good surface coverage of mesoporous TiO2 but accelerates the formation of large and rod-like perovskite crystals. (Fig.1 (A)) On the other hand, a planer perovskite was formed on the surface of TiO2 from the solution containing chloride. (Fig.1 (B)) The solar cell performances depended on the difference of the perovskite structures. The control of crystal growth is considered to be essential to realize efficient perovskite solar cells. Additionally, it has been seen that the stability of the devices is also influenced by the crystallization processes. The perovskite solar cells with chloride shows a longer device stability compared to the one without chloride.
Fig.1, SEM image of CH3NH3PbI3 (A) and CH3NH3PbClxI3-x (B) deposited on mesoporous TiO2.
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