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, Hendrik 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

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

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.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.