Impedance Spectroscopy Analysis of DegradatedPerovskite Solar Cells
Jeevan Torres a b d, Diego Esparza b, Michael Saliba c, Iván Mora-Seró a, Silver-Hamill Turren-Cruz a d, Antonio Abate d
a Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat, s/n, 12071, Castello de la Plana, Spain.
b Unidad Académica de Ingeniería Eléctrica, Universidad Autónoma de Zacatecas Av. Ramon López Velarde 801, Col. Centro, 98060, Zacatecas, Zac., México.
c Institute for Photovoltaics (ipv), University of Stuttgart, Pfaffenwaldring 47, 70569, Stuttgart, Germany
d Young Investigator Group Active Materials and Interfaces for Stable Perovskite Solar Cells, Helmholtz-Zentrum Berlin für Materialen und Energie GmbH, Kekuléstraße 5, Berlin, Germany
Proceedings of Sustainable Metal-halide perovskites for photovoltaics, optoelectronics and photonics (Sus-MHP)
València, Spain, 2022 December 12th - 13th
Organizers: Teresa S. Ripolles and Hui-Seon Kim
Poster, Jeevan Torres, 044
Publication date: 15th November 2022

In this work, the electrical properties of different triple cation compositions with the formula Cs0.05FA1−XMAXPb(I1−XBrX)3 have been analyzed using electrochemical impedance spectroscopy. As triple cation perovskites are so far the most stable perovskites, and stability is the main challenge in order to have this technology in the market; we look for the most stable combination of cations to overcome this challenge. The perovskite solar cells were subjected to ambient conditions to compare their results in terms of ambient degradation. We analyzed the causes and effects of ambient degradation mechanisms on the devices. Electrochemical processes such as ion movement, a combination of radiative recombination and non radiativere combination, and charge transport were detected. The MA percentage decrease in the composition of triple cation perovskites, APbX3 produces an improvement in the stability and durability of perovskite solar cells. This enhancement is due to the reduction of the amount of ion vacancies helping to reduce the degradation in the device by avoiding the accumulation of defects.

S.-H.T.-C. would like to thank the Spanish Ministry of Economy, Industry and Competitiveness (postdoctoral contract
Juan de la Cierva Formación FJC2019-041835-I) for the financial support during this work. Jeevan Torres would like to thank the European Social Fund For the financial support. 

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