posted on 2024-06-24, 04:43authored byJakob Ihrenberger, Frédéric Roux, Ferdinand Lédée, Fabrice Emieux, Christelle Anglade, Thibault Lemercier, Géraldine Lorin, Eric Gros-Daillon, Louis Grenet
The all-inorganic metal halide perovskite
CsPbBr3 is
a well-known semiconductor which attracts attention from many researchers
in the field of optoelectronics. Although CsPbBr3 in the
form of single crystals offers the best charge transport properties,
their high cost of fabrication makes them less suitable for large-scale
applications. Polycrystalline films, on the other hand, can fill this
market gap, and numerous solution- and vapor-based techniques exist
to produce them. However, no superior solution has been found yet,
and we propose the less explored close space sublimation (CSS), a
fast and scalable physical vapor deposition technique, as a viable
processing technique for manufacturing CsPbBr3 films. We
show the fabrication of high-quality single-phase CsPbBr3 films with homogeneous film thicknesses over an area of 3.14 cm2. By optimizing the deposition temperature, a growth rate
of 10 μm/min can be reached with a material utilization of up
to 98%. In addition, the necessary CsPbBr3 source material
is synthesized via ball milling; hence, the whole process is solvent-free.
This work aims at rationalizing the CSS process and offering a comprehensive
study of the impact of the deposition conditions on the growth of
CsPbBr3.