Large grain size with reduced non-radiative recombination in potassium incorporated methylammonium-free perovskite solar cells
Gabriela S. Anaya Gonzalez a b, Jose J. Jeronimo-Rendon c, Qiong Wang a, Guixiang Li a, Agustin O. Alvarez e, Francisco Fabregat-Santiago e, Alberto Alvarado b, Hector Juárez-Santiesteban b, Silver-Hamill Turren-Cruz a e, Michael Saliba c d, Antonio Abate a
a Department of Novel Materials and Interfaces for Photovoltaic Solar Cells, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstrasse 5, 12489 Berlin, Germany
b Benemérita Universidad Autónoma de Puebla. CIDS, Av. San Claudio y 18 Sur, Col. San Manuel, Ciudad Universitaria, CP 72570, P.O. Box 1067, Puebla, Pue., 7200, México
c University of Stuttgart, Institute for Photovoltaics, Pfaffenwaldring 47, 70569 Stuttgart, Germany
d Helmholtz Young Investigator Group FRONTRUNNER, IEK5-Photovltaics Forschungszentrum Jülich, 52425 Jülich, Germany
e Institute of Advanced Materials (INAM), Universtitat Jaume I, Avda. V. Sos Baynat s/n, 12006 Castellón de la Plana, Spain.
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Jose J. Jeronimo-Rendon, 238
Publication date: 20th April 2022


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.

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info