Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Over the last decades, hybrid organic-inorganic metal halide perovskites have emerged as promising materials for low-cost, flexible and highly efficient solar cells. However, the lack of long-term stability with regard to humidity, heat, light, and oxygen restricts their outdoor photovoltaic applications and commercialization. In this work, we fabricate Methylammonium Lead Iodide (CH3NH3PbI3) films and devices by solvent engineering in N2 and in ambient conditions with different humidities. Their aging and degradation is monitored by optical absorption and impedance spectroscopy measurements at open circuit for two excitation wavelengths (blue and red light). Aged devices show a substantial difference between the recombination rate under red and blue light illumination, attributed to enhancement of local recombination routes upon aging. Interestingly, this effect is more pronounced for devices prepared at low humidity conditions. We explain this by the presence of coordinating water in the films, as detected by XPS measurements. Hence, small amounts of water in the perovskite structure prove to have a beneficial effect against degradation in humid environments.
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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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