High Open-Circuit Voltage Lead-Free Cs2AgBiBr6 Double Perovskite Solar Cells from Spray-Coating Deposition

Nathan Daem^a, Jennifer Dewalque^a, Felix Lang^b, Anthony Maho^a, Gilles Spronck^a, Catherine Henrist^a, Pierre Colson^a, Samuel D. Stranks^b^,^c, Rudi Cloots^a

^aUniversity of Liege, GREENMAT, Allée du 6 Aout 13, 4000 Liege, Belgium

^bCavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, UK

^cDepartment of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, United Kingdom

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

Oral, Nathan Daem, presentation 047
DOI: https://doi.org/10.29363/nanoge.hopv.2022.047
Publication date: 20th April 2022

Lead-free Cs₂AgBiBr₆ double perovskite is considered as a promising alternative photovoltaic absorber to widely used lead halide perovskites due to its easy processability, high stability, and reduced toxicity.

In this presentation^[1], spray-coating processing is considered for the deposition of high quality Cs₂AgBiBr₆ double perovskite thin films. Microstructural (X-ray diffraction, scanning electron microscopy) and optoelectronic (absorbance, photoluminescence, photocurrent density versus applied voltage curves, electrochemical impedance spectroscopy) properties of spray-coated film are compared with a spin-coated benchmark. Incorporation of the spray-coated Cs₂AgBiBr₆ double perovskite thin films in solar cells leads to 2.3% photoconversion efficiency with high open-circuit voltage of 1.09 V.

This study highlights the suitability of ultrasonic spray deposition for the optimization of Cs₂AgBiBr₆ solar cells in terms of microstructural properties, light absorption properties and charge transfer at the Cs₂AgBiBr₆/hole transporting layer interface.

References:

[1] Solar RRL, vol. 5, no. 9, 2021.

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