Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
New materials such as organolead halide perovskites (e.g. CH3NH3PbI3) with interesting electrical properties, allow to use those as active layers in efficient and versatile photovoltaic devices. To understand the relationship of the electrical properties of this kind of materials and the efficiency of the solar cells, it is important to deeply investigate about the electrical transport phenomena in those.
In this work, a study of trap center properties in thin films of organo lead halide perovskites with different compositions (MAPbI3 ,MAPbI2Br and MAPbI2Cl) prepared by spin-coating was carried out through Thermally Stimulated Current (TSC) measurements. In this technique, a sample is cooled and illuminated to fill the trap states and after that it is slowly heated applying a constant electric field to extract the current due to thermal excitation of the trapped charge carriers. Using various heating rates and adjusting the experimental peaks, information regarding trap centers and/or deep levels present within the band-gap of this material was obtained. Deconvolution of the temperature-dependent current curves revealed the existence of trap centers at three different levels.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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