1 research outputs found
Single-Source, Solvent-Free, Room Temperature Deposition of Black γ-CsSnI<sub>3</sub> Films
The presence of a non-optically active polymorph (yellow-phase) competing
with the optically active polymorph (black -phase) at room temperature
in CsSnI3 and the susceptibility of Sn to oxidation, represent two of the
biggest obstacles for the exploitation of CsSnI3 in optoelectronic devices.
Here room-temperature single-source in vacuum deposition of smooth black
- CsSnI3 thin films is reported. This has been done by fabricating a
solid target by completely solvent-free mixing of CsI and SnI2 powders and
isostatic pressing. By controlled laser ablation of the solid target on an
arbitrary substrate at room temperature, the formation of CsSnI3 thin films
with optimal optical properties is demonstrated. The films present a band gap
of 1.32 eV, a sharp absorption edge and near-infrared photoluminescence
emission. These properties and X-ray diffraction of the thin films confirmed
the formation of the orthorhombic (B-) perovskite phase. The thermal
stability of the phase was ensured by applying in situ an Al2O capping
layer. This work demonstrates the potential of pulsed laser deposition as a
volatility-insensitive single-source growth technique of halide perovskites and
represents a critical step forward in the development and future scalability of
inorganic lead-free halide perovskites.Comment: Accepted by Advanced Materials Interfaces, 16 pages, 4 figures, and
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