Working mechanisms of vacuum-deposited perovskite solar cells
Daniel Perez-del-Rey a, Pablo P. Boix a, Benedikt Dänekamp a, Jorge Ávila a, Cristina Momblona a, Michele Sessolo a, Henk Bolink a
a Universidad de Valencia - ICMol (Institute of Molecular Science), Catedrático José Beltrán Martinez 2, Paterna, Spain
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Oral, Pablo P. Boix, presentation 132
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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