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Spray‐Coated Lead‐Free Cs 2 AgBiBr 6 Double Perovskite Solar Cells with High Open‐Circuit Voltage
Author(s) -
Daem Nathan,
Dewalque Jennifer,
Lang Felix,
Maho Anthony,
Spronck Gilles,
Henrist Catherine,
Colson Pierre,
Stranks Samuel D.,
Cloots Rudi
Publication year - 2021
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202100422
Subject(s) - materials science , perovskite (structure) , open circuit voltage , thin film , dielectric spectroscopy , photocurrent , optoelectronics , scanning electron microscope , deposition (geology) , photoluminescence , chemical engineering , analytical chemistry (journal) , nanotechnology , voltage , composite material , chemistry , electrochemistry , electrode , paleontology , physics , quantum mechanics , sediment , engineering , biology , chromatography
Lead‐free Cs 2 AgBiBr 6 double perovskite is considered a promising alternative photovoltaic absorber to the widely used lead halide perovskite due to its easy processability, high stability, and reduced toxicity. Herein, for the first time spray processing for the deposition of Cs 2 AgBiBr 6 double perovskite thin films is reported. 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 the spin‐coated benchmark. Incorporation of the spray‐coated Cs 2 AgBiBr 6 double perovskite thin films in solar cells leads to a 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 Cs 2 AgBiBr 6 solar cells in terms of light absorption properties and charge transfer at the Cs 2 AgBiBr 6 /hole transporting layer interface.