Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.132
Publication date: 21st February 2018
Vacuum-deposition is one of the most technologically relevant techniques for the fabrication of perovskite solar cells. Althought it can be used to fabricate devices with power conversion efficiency close to that obtained by solution-methods, only few studies have been carried out on vapor-deposited perovskite films. Clear differences among both fabrication families, such as the perovskite grain size of the most efficient devices, raises new questions regarding the basic working mechanisms of the solar cells, which should be addressed to develop the full potential of this technology.
Here, we use the intrinsically additive nature of vapor-based processes to carry out a detailed study of the solar cell interfaces and perovskite optoelectronic properties. Kelvin probe and impedance spectroscopy analysis are used to design a band alignement adjustment, which results in CH3NH3PbI3 solar cells with open circuit potential close to the thermodinamical limit and power conversion efficiency >20 %. The co-operation of multiple sources is also employed for the fabrication of multi-cations/anions perovskite compounds by thermal vacuum deposition for the first time. The limiting factors of these cells are studied through a variation of device architectures and absorber thickness.
This work presents an outlook of the main processes determining the performance of vacuum-deposited solar cells, which can be crucial to develop the ideal system based on this industrially mature technique.
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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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