Engineering of Perovskite Materials Based on Formamidinium and Cesium Hybridization for High-Efficiency Solar Cells
Rashmi Runjhun a, Daniel Prochowicz a b, Mohammad Tavakoli b c, Pankaj Yadav d, Marcin Saski a, Anwar Alanazi b, Dominik Kubicki b e, Zbigniew Kaszkur a, Shaik Zakeeruddin b, Janusz Lewiński a f, Michael Grätzel b
a Institute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, Poland
b Laboratory of Photonics and Interfaces (LPI), Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
c Department of Materials Science and Engineering, Sharif University of Technology, 14588 Tehran, Iran
d Department of Solar Energy, Pandit Deendayal Petroleum University, Gandhinagar-380007, India
e Laboratory of Magnetic Resonance, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
f Faculty of Chemistry, Warsaw University of Technology, Warszawa, Poland
Proceedings of Interfaces in Organic and Hybrid Thin-Film Optoelectronics (INFORM)
València, Spain, 2019 March 5th - 7th
Organizers: Natalie Stingelin, Henk Bolink and Michele Sessolo
Poster, Rashmi Runjhun, 089
Publication date: 8th January 2019

The efficiency and stability of inorganic-organic hybrid perovskite solar cells (PSCs) majorly depends on chemical composition of perovskite materials. Engineering the perovskite composition has been successfully employed for improving the performance of PSCs.  Recently methylammonium-free mixed A-site cation CsxFA1‐xPbI3 perovskites have emerged as an attractive active material for the fabrication of high efficiency solar cells. These perovskites have optimum bandgap, and superior optoelectronic property [1-3]. Additionally, introducing Cs cation into the formamidinium lead iodide (FAPbI3) perovskite system improves the phase stability again humidity as well as thermal stress.

Here, we develop a simple and very effective one-step solution method for the preparation of high-quality (Cs)x(FA)1-xPbI3 perovskite films upon the addition of excess CsCl to the FAPbI3 precursor solution. We observed that the grain size and film quality significantly improved by changing the CsI to CsCl as a source of Cs cation. The increased charge mobility, reduced carrier recombination and long carrier lifetime resulted into high efficiency solar cells with a maximum efficiency of 20.60%, stabilized PCE of 19.85% and lower hysteresis as compared to the reference devices.

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