Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.020
Publication date: 27th October 2017
Lead Halide Perovskites need to improve their stability and environmental safety concerns. Tin halide has been considered as a candidate for replacing the demerits of lead halide but not much is known about its electrical properties. In this study, we report carrier transport and potential distribution of lead and tin halide thin films which were grown on mesoporous titanium oxides. Electronic structure was measured via Kelvin probe force microscopy and its optical exciations were also measured under illumination of laser light onto the sample. We are able to obtain interesting reponses which are strongly dependent on grain boundaries. It was reported that carrier transport inn perovskites is related to the band bending of the materials like Cu(In,Ga)S2 solar cells [1]. Conductive atomic force microscopy in order to investigate the roles of the grain boundaries for charge transport in lead and tin halides. We revealed the existence of a potential barrier at grain boundaries demonstrated thorough the charged region between the grain boundaries and intra grains. Hole entrapment near the grain boundaries in the perovskite thin films will have a positive effect on the utilization of solar cells and other applications by improving the electrical quality characteristics, such as the carrier collection and recombination.
[1] G. Y. Kim, S. H. Oh, B. P. Nguyen, W. Jo, B. J. Kim, D. G. Lee, H. S. Jung, "Efficient Carrier Separation and Intriguing Switching of Bound Charges in Inorganic-Organic Lead Halide Solar Cells", Journal of Physical Chemistry Letters, 6, 2355 (2015).
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