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

^aInstitute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland, Kasprzaka, 44/52, Warszawa, Poland

^bLaboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, Switzerland

^cDepartment of Materials Science and Engineering, Sharif University of Technology, Iran, Tehran - Pardis Freeway, Tehran, Iran, Islamic Republic of

^dDepartment of Solar Energy, Pandit Deendayal Petroleum University, Gandhinagar-380007, India

^eEcole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

^fFaculty 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 Cs_xFA_1‐xPbI₃perovskites 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 FAPbI₃precursor 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.

References:

[1] Li, Z.; Yang, M.; Park, J.-S.; Wei, S.-H.; Berry, J. J.; Zhu, K. Stabilizing Perovskite Structures by Tuning Tolerance Factor: Formation of Formamidinium and Cesium Lead Iodide Solid-State Alloys. Chem. Mater. 2016, 28, 284–292

[2] Liu, T.; Zong, Y.; Zhou, Y.; Yang, M.; Li, Z.; Game, O. S.; Zhu, K.; Zhu, R.; Gong, Q.; Padture, N. P. High-Performance Formamidinium-Based Perovskite Solar Cells via Microstructure-Mediated δ-to-α Phase Transformation. Chem. Mater. 2017, 29, 3246–3250

[3] Bella, F.; Renzi, P.; Cavallo, C.; Gerbaldi, C. Caesium for Perovskite Solar Cells: An Overview. Chem. - Eur. J. 2018, 24, 12183–12205

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