Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
Abstract
Organic-inorganic halide perovskites are widely considered highly promising materials as solar cells and they have attracted considerable interest due to their excellent optical and electrical properties. It has been reported that potassium ion (K+) incorporation is a powerful strategy to tune the material properties. However, the precise role of this monovalent alkali metal is still not fully elucidated yet. Adding K+ has already been applied to methylammonium (MA)/formamidinium (FA) based perovskites and favourable effects were observed.[1] However, fewer studies were conducted on the impact of K+ on formamidinium (FA) based perovskites, which has multiple phases and therefore is a more complex system comparted to pure MA-perovskites.
Here, we investigated the impact of K+ on film properties and the photovoltaic performance of double cation perovskite solar cells made from Cs0.1FA0.9PbI3 precursor solution. We found that very likely, K+ is not incorporated in the A-site in accordance to previous research. From our SEM results, it could be seen that this ion induces the extraction of non-reactive PbI2 from the bulk, resulting in a notable enhancement in the quality of the double cation perovskite film, which is confirmed by XRD patters where this signal peak decreases as the addition of K+ increases. Thus, the addition of this counter ion provokes enlarged grain sizes and reduces the non-radiative recombination observed from PL graphs. This leads to an enhancement in Jsc and Voc, as is shown in J-V results.
Gabriela S. Anaya Gonzalez thanks the Consejo Nacional de Ciencia y Tecnología (CONACYT) for financial support and The Helmholtz-Zentrum Berlin for materials and energy. M. Saliba received funding from the Helmholtz Young Investigator Program at Forschungszentrum Jülich, Germany. M. Saliba acknowledge funding from the German Research Foundation (DFG), SPP2196 and GRK 2642. A.O.A and S.F.F acknowledge funding from the European Union’s Horizon 2020 MSCA Innovative Training Network under grant agreement No 764787, from the Ministerio de Economía y Competitividad (MINECO) of Spain under the project ENE2017-85087-C3-1-R and from the Generalitat Valenciana under the project PROMETEO/2020/028.
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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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