Publication date: 8th January 2019
Hybrid halide perovskites are materials with a high potential in optoelectronics and particularly in the field of solar energy due to its excellent properties such as wide range of light absorption, high mobility and long lifetimes of carriers. These features are ideal also for applications in electronic devices. So far, its properties are mainly known at the polycrystalline level being part of a complete device with its corresponding selective layers. However, this type of configuration introduces strong interactions between the different materials. Therefore, in order to understand the internal optical and electrical properties and avoiding the interferences neighboring grain boundaries or defects we propose the direct study on microcrystalline single crystals.
In this regard, we have carried out a systematic study of the electrical properties of methylammonium bromide perovskite at single-crystal level, being able to optimize the measurements made by maximizing the photocurrent obtained by irradiation with a supercontinuum laser beam. In addition, we have observed important differences between the geometry, size and composition of the different perovskite crystals studied.
Moreover, in this study we made measurements with different selective electron and hole layers and determining their contribution in the process of charge separation and transport.
Financial support from the Spanish Ministry of Economy and Competitiveness (Severo Ochoa, SEV-2016-0683), Intramural CSIC project 201680I006, and Fundación Ramón Areces (XVII Concurso Nacional para la adjudicación de Ayudas a la Investigación en Ciencias de la Vida y de la Materia) is gratefully acknowledged. Financial support was also provided by the Spanish Ministry of Economy and Competitiveness (Mineco) of Spain (TEC2015-74405-JIN), MAT2015-69669-P, and regional government grant PrometeoII/2017/026.
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