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High-k dielectrics on (100) and (110) n-InAs: Physical and electrical characterizations.
- Source :
- AIP Advances; Apr2014, Vol. 4 Issue 4, p1-9, 9p
- Publication Year :
- 2014
-
Abstract
- Two high-k dielectric materials (Al<subscript>2</subscript>O<subscript>3</subscript> and HfO<subscript>2</subscript>) were deposited on n-type (100) and (110) InAs surface orientations to investigate physical properties of the oxide/ semiconductor interfaces and the interface trap density (D<subscript>it</subscript>). X-ray photoelectron spectroscopy analyses (XPS) for native oxides of (100) and (110) as-grown n-InAs epi wafers show an increase in As-oxide on the (100) surface and an increase in InOx on the (110) surface. In addition, XPS analyses of high-k (Al<subscript>2</subscript>O<subscript>3</subscript> and HfO<subscript>2</subscript>) on n-InAs epi show that the intrinsic native oxide difference between (100) and (110) epi surfaces were eliminated by applying conventional in-situ pre-treatment (TriMethyAluminium (TMA)) before the high-k deposition. The capacitance-voltage (C-V) characterization of HfO<subscript>2</subscript> and Al<subscript>2</subscript>O<subscript>3</subscript> MOSCAPs on both types of n-InAs surfaces shows very similar C-V curves. The interface trap density (Dit) profiles show Dit minima of 6.1 × 10<superscript>12</superscript>/6.5 × 10<subscript>12</subscript> and 6.6 × 10<superscript>12</superscript>/7.3 × 10<superscript>12</superscript> cm<superscript>-2</superscript> eV-1 for Al<subscript>2</subscript>O<subscript>3</subscript> and HfO<subscript>2</subscript>, respectively for (100) and (110) InAs surfaces. The similar interface trap density (Dit) on (100) and (110) surface orientation were observed, which is beneficial to future InAs FinFET device with both (100) and (110) surface channel orientations present. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21583226
- Volume :
- 4
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- AIP Advances
- Publication Type :
- Academic Journal
- Accession number :
- 95910704
- Full Text :
- https://doi.org/10.1063/1.4871187