Lead‐free Cs2AgBiBr6 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 Cs2AgBiBr6 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 Cs2AgBiBr6 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 Cs2AgBiBr6 solar cells in terms of light absorption properties and charge transfer at the Cs2AgBiBr6/hole transporting layer interface.
Photonic structuration is an efficient
way to improve light harvesting
in multiple optoelectronic applications. In this study, photonically
structured TiO2 is considered as a photoanode layer for
perovskite solar cells to enhance light absorption through the excitation
of quasi-guided modes within the photoactive perovskite material,
while optimizing the charge collection in the photovoltaic assembly
and therefore its global efficiency. Practically, polystyrene beads
of various diameters are used as hard templating sacrificial agents
for the design of inverse-opal TiO2 through spin-coating
protocols. The positive impact of the porous photonic structuration
in comparison with compact, unstructured photoactive layers is demonstrated.
An optimum of light absorption is shown for hybrid TiO2–perovskite structures composed of ∼400 nm diameter
TiO2 hollow spheres filled with CH3NH3PbI3, confirming recent numerical predictions. However,
electronic-related countereffects are observed in consecutively assembled
solar cells when pore dimensions exceed the estimated diffusion length
of electrons in the infiltrated perovskite material. Upper conversion
efficiency is obtained with solar cells composed of ∼220 nm
diameter large TiO2 pores filled with CH3NH3PbI3.
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