posted on 2021-09-06, 12:33authored byNathan Rodkey, Stan Kaal, Paz Sebastia-Luna, Yorick A. Birkhölzer, Martin Ledinsky, Francisco Palazon, Henk J. Bolink, Monica Morales-Masis
Cs2AgBiBr6 has been proposed as a promising
lead-free and stable double perovskite alternative to hybrid and lead-based
perovskites. However, the low solubility of precursors during wet
synthesis, or the distinct volatility of components during evaporation,
results in complex multistep synthesis approaches, hampering the widespread
employment of Cs2AgBiBr6 films. Here, we present
pulsed laser deposition of Cs2AgBiBr6 films
as a dry, single-step and single-source deposition approach for high-quality
film formation. Cs2AgBiBr6 powders were prepared
by mechanochemical synthesis and pressed into a solid target maintaining
phase purity. Controlled laser ablation of the double perovskite target
in vacuum and a substrate temperature of 200 °C results in the
formation of highly crystalline Cs2AgBiBr6 films.
We discuss the importance of deposition pressure to achieve stoichiometric
transfer and of substrate temperature during PLD growth to obtain
high-quality Cs2AgBiBr6 films with grain sizes
> 200 nm. This work demonstrates the potential of PLD, an established
technique in the semiconductor industry, to deposit complex halide
perovskite materials while being compatible with optoelectronic device
fabrication, such as UV and X-ray detectors.