Influence of the anodic etching current density on the morphology of the porous SiC layer

In this report, we fabricated a porous layer in amorphous SiC thin films by using constant-current anodic etching in an electrolyte of aqueous diluted hydrofluoric acid. The morphology of the porous amorphous SiC layer changed as the anodic current density changed: At low current density, the porous...

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Bibliographic Details
Published in:AIP advances 2014-03, Vol.4 (3), p.037105-037105-7
Main Authors: Cao, Anh Tuan, Luong, Quynh Ngan Truc, Dao, Cao Tran
Format: Article
Language:English
Subjects:
Columnar structure
Current density
Etching
Hydrofluoric acid
Morphology
Pore size
Porosity
Thin films
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Summary:In this report, we fabricated a porous layer in amorphous SiC thin films by using constant-current anodic etching in an electrolyte of aqueous diluted hydrofluoric acid. The morphology of the porous amorphous SiC layer changed as the anodic current density changed: At low current density, the porous layer had a low pore density and consisted of small pores that branched downward. At moderate current density, the pore size and depth increased, and the pores grew perpendicular to the surface, creating a columnar pore structure. At high current density, the porous structure remained perpendicular, the pore size increased, and the pore depth decreased. We explained the changes in pore size and depth at high current density by the growth of a silicon oxide layer during etching at the tips of the pores.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4869017