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The Growth of CuGaTe 2 Thin Films by Two‐Step Closed Space Sublimation
Author(s) -
Uruno Aya,
Kobayashi Masakazu
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800883
Subject(s) - sublimation (psychology) , materials science , quartz , nucleation , thin film , morphology (biology) , hexagonal crystal system , surface energy , crystallography , layer (electronics) , substrate (aquarium) , chemical engineering , nanotechnology , composite material , chemistry , psychology , oceanography , organic chemistry , biology , geology , engineering , psychotherapist , genetics
CuGaTe 2 layers are successfully grown on Si (001) and Mo/quartz substrates using two‐step closed space sublimation (CSS). The surface morphology of the Cu 2 Te first layer is affected by the surface free energy of the different substrates. Cu 2 Te grown on Si (001) comprises hexagonal islands which are highly oriented to the (0001). Conversely, Cu 2 Te layers formed on Mo/quartz substrates forms a thin film. The surface morphology and the quality of the crystals in the CuGaTe 2 layers are investigated. Overgrowth by CuGaTe 2 of the Cu 2 Te islands on Si substrates is confined to the islands only and there is no nucleation on the bare substrate. On the contrary, overgrowth by CuGaTe 2 on the continuous Cu 2 Te films on Mo/quartz substrates produces continuous thin films. Therefore, the surface morphology of the CuGaTe 2 layers can be controlled by changing the substrate material because they have different surface free energies.