Plasma and vacuum ultraviolet induced charging of SiO{sub 2} and HfO{sub 2} patterned structures

Journal Article · Sun Jan 15 00:00:00 EST 2012 · Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films

DOI:https://doi.org/10.1116/1.3654012· OSTI ID:22054130

Lauer, J L; Upadhyaya, G S; Sinha, H; Kruger, J B; Nishi, Y; Shohet, J L ^[1]

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1. Plasma Processing and Technology Laboratory and Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)

The authors compare the effects of plasma charging and vacuum ultraviolet (VUV) irradiation on oxidized patterned Si structures with and without atomic-layer-deposited HfO{sub 2}. It was found that, unlike planar oxidized Si wafers, oxidized patterned Si wafers charge up significantly after exposure in an electron-cyclotron resonance plasma. The charging is dependent on the aspect ratio of the patterned structures. This is attributed to electron and/or ion shading during plasma exposure. The addition of a 10 nm thick HfO{sub 2} layer deposited on top of the oxidized silicon structures increases the photoemission yield during VUV irradiation, resulting in more trapped positive charge compared to patterns without the HfO{sub 2} dielectric.

• OSTI ID: 22054130
• Journal Information: Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films, Vol. 30, Issue 1; Other Information: (c) 2012 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1553-1813
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASPECT RATIO
DEPOSITION
DIELECTRIC MATERIALS
ELECTRON CYCLOTRON-RESONANCE
FAR ULTRAVIOLET RADIATION
HAFNIUM OXIDES
PHOTOEMISSION
PLASMA
SILICON
SILICON OXIDES
TRAPS
VACUUM COATING