Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.104
Publication date: 21st February 2018
In this work we present the photoluminisence of perovskite monocrystals made of methylamonium lead bromide (MAPBr) in which the bromide has been partially substituted by iodide (I) in one of the sides. In such configuration, most of the crystal has the orange color of the MAIPbBr and only one of the the sides is black as MAPI. We show that for good samples, phtoluminiscence occurs mostly in the part with MAPI. Thus most of the charges photogenerated by light in any part of the MAPBr crystal, are collected in the energetically lower states of the MAPI part of the crystal, where they recombine. This implies that charge carriers are able to diffuse lengths in the range comprised between mm and cm. Discussion will be centered in the mechanisms that lead to these large diffusion lengths that allow the concentration of recombination in the MAPI and then in the potential applications of these structures.
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