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CdTe deposition by successive ionic layer adsorption and reaction (SILAR) technique onto ZnO nanowires
Author(s) -
Salazar Raul,
Delamoreanu Alexandru,
Saidi Bilel,
LévyClément Claude,
Ivanova Valentina
Publication year - 2014
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.201300632
Subject(s) - cadmium telluride photovoltaics , materials science , sublimation (psychology) , amorphous solid , crystallite , nanowire , heterojunction , nanotechnology , chemical engineering , adsorption , layer (electronics) , annealing (glass) , ionic bonding , chemical bath deposition , thin film , optoelectronics , ion , chemistry , crystallography , composite material , metallurgy , organic chemistry , psychotherapist , psychology , engineering
In this study is reported CdTe deposition by Successive Ionic Layer Adsorption and reaction (SILAR) at room temperature onto ZnO nanowires (NWs). The as‐deposited CdTe layer exhibits poor crystalline quality and not well defined optical transition which is probably result of its amorphous nature. The implementation of an annealing step and chemical treatment by CdCl 2 to the classical SILAR technique improved significantly the CdTe film quality. The XRD analysis showed that the as treated layers are crystallized in the cubic zinc blende structure. The full coverage of ZnO nanowires and thickness of the CdTe shell, composed of small crystallites, was confirmed by STEM and TEM analysis. The layer thickness could be controlled by the number of SILAR cycles. The sharper optical transitions for the annealed and CdCl 2 treated heterostructures additionally proves the enhancement of the layer crystalline quality. For comparison CdTe was also deposited by close space sublimation (CSS) method onto ZnO nanowires. It is shown that the SILAR deposited CdTe exhibits equal crystalline and optical properties to that prepared by CSS. These results demonstrate that SILAR technique is more suitable for conformal thin film deposition on nanostructures. CdTe extremely thin film deposited by SILAR method onto ZnO nanowire.