TY - JOUR
T1 - Vapor deposition of CsPbBr3thin films by evaporation of CsBr and PbBr2
AU - Cleveland, Iver J.
AU - Tran, Minh N.
AU - Dey, Anamika
AU - Aydil, Eray S.
N1 - Funding Information:
The X-ray microdiffractometer with GADDS was acquired through the support of the National Science Foundation under Award Numbers CRIF/CHE-0840277 and the NSF MRSEC Program under Award Number DMR-0820341.
Publisher Copyright:
© 2021 Author(s).
PY - 2021/7/1
Y1 - 2021/7/1
N2 - Thin films of the inorganic halide perovskite, CsPbBr3, find applications in various optoelectronic devices, including solar cells, radiation detectors, light-emitting diodes, photodetectors, and lasers. Physical vapor deposition (PVD) by coevaporation of CsBr and PbBr2 onto a substrate is a scalable solventless approach to forming high purity large-grained polycrystalline films. Herein, we investigate the effects of deposition temperature, between 26 and 162 °C, and postdeposition annealing, between 250 and 350 °C, on the structure, texturing, and morphology of orthorhombic CsPbBr3 films formed by PVD. All films, regardless of the stable phase at the deposition temperature, transform to orthorhombic upon cooling to room temperature. The films deposited as orthorhombic or tetragonal CsPbBr3 below 130 °C were textured in the orthorhombic structure's ⟨202»direction, while cubic CsPbBr3 films deposited above 130 °C were textured in the orthorhombic structure's ⟨121»direction. This texturing favors the growth of high cation density planes of the stable phase at the deposition temperature. The orthorhombic ⟨202»texturing also dominates after annealing as long as the films have ⟨202»aligned grains before annealing.
AB - Thin films of the inorganic halide perovskite, CsPbBr3, find applications in various optoelectronic devices, including solar cells, radiation detectors, light-emitting diodes, photodetectors, and lasers. Physical vapor deposition (PVD) by coevaporation of CsBr and PbBr2 onto a substrate is a scalable solventless approach to forming high purity large-grained polycrystalline films. Herein, we investigate the effects of deposition temperature, between 26 and 162 °C, and postdeposition annealing, between 250 and 350 °C, on the structure, texturing, and morphology of orthorhombic CsPbBr3 films formed by PVD. All films, regardless of the stable phase at the deposition temperature, transform to orthorhombic upon cooling to room temperature. The films deposited as orthorhombic or tetragonal CsPbBr3 below 130 °C were textured in the orthorhombic structure's ⟨202»direction, while cubic CsPbBr3 films deposited above 130 °C were textured in the orthorhombic structure's ⟨121»direction. This texturing favors the growth of high cation density planes of the stable phase at the deposition temperature. The orthorhombic ⟨202»texturing also dominates after annealing as long as the films have ⟨202»aligned grains before annealing.
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U2 - 10.1116/6.0000875
DO - 10.1116/6.0000875
M3 - Article
AN - SCOPUS:85107963120
SN - 0734-2101
VL - 39
JO - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
JF - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
IS - 4
M1 - 043415
ER -