Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Solar cells based on the light harvesting perovskite layer have shown very promising efficiencies from 3.8% in 2009 to 22.1% in early 2016. These perovskite based devices can be fabricated with organic-inorganic trihalide perovskites using solution processes. The mixed halide perovskite was applied to tune the bandgap of the light absorbing layer and today the most efficient perovskite solar cell is made of a mixed-cation mixed-halide perovskite. Although the most attention has been devoted to get highly efficient perovskite solar cells, but the investigation of transport and recombination processes makes a step forward to optimize the device. This study aims to investigate the important parameters of cell performance such as resistance, conductivity and diffusion length of mixed-cation mixed-halide perovskite solar cells. For this purpose, perovskite layer was prepared using a mixture of formamidinium iodide, methylammonium bromide, lead iodide, and lead bromide, spin coated on top of the mesoporous titanium dioxide at ambient conditions. Spiro-MeOTAD was spin coated on top of the perovskite layer as the hole transporting material; the devices were completed after making a metal contact as a counter electrode. The as-prepared devices were characterized by Impedance Spectroscopy at different applied voltages. Nyquist and Bode plots were acquired at different applied voltages, to measure resistance, conductivity and diffusion length of the solar cells and explain the role of this mixed-cation mixed-halide perovskite in device performance. To further study the perovskite layer, the Impedance experiments were performed on devices with varied thickness of the perovskite layer.
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International Conference on Hybrid and Organic Photovoltaics
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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