Enhanced electron mobility at Gd2O3(100)/Si(100) interface: origin and applications

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Sitaputra, W. (2012). Enhanced electron mobility at Gd2O3(100)/Si(100) interface: origin and applications. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

A growth of a gadolinium oxide (Gd2O3) layer with (100) orientation on a Si(100) substrate was obtained for the first time using molecular beam epitaxy deposition (MBE) with the growth temperature in the range of 150-200°C and the oxygen partial pressure in the range of 10-7-10-6 Torr. The growth was performed on three type of Si(100) substrate; n-type, p-type, and intrinsic. Among the three major orientations, i.e. (111), (110) and (100), the Gd2O3(100) is known from energetic point of view to be least favorable. Nonetheless, an enhancement in electron mobility can only be found from the interface between Gd2O3(100) and Si(100). Although p-type Si(100) results in the best structural considerations from x-ray diffraction among the three types of substrate, the best feature was observed in the Gd2O3(100)/n-type Si(100) because of its highest mobility enhancement and satisfactory structural stability. The mobility of 1670-1780 cm2/V·s was observed at room temperature, for carrier concentration > 1018cm-3. This amounts to a factor of four higher in electron mobility compared to a heavily doped n-type substrate with similar carrier concentration. This accumulation of electrons and mobility enhancement are attributed to two-dimensional confinement from charges transfer across the interface quite similar to modulation doping. Owing to these properties, the Gd2O3(100) becomes a promising candidate in promoting the scaling of logic devices.

Details
Author

Sitaputra, Wattaka

Title

Enhanced electron mobility at Gd2O3(100)/Si(100) interface: origin and applications

Physical Description

1 online resource (74 pages) : PDF

Date

2012

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

A growth of a gadolinium oxide (Gd2O3) layer with (100) orientation on a Si(100) substrate was obtained for the first time using molecular beam epitaxy deposition (MBE) with the growth temperature in the range of 150-200°C and the oxygen partial pressure in the range of 10-7-10-6 Torr. The growth was performed on three type of Si(100) substrate; n-type, p-type, and intrinsic. Among the three major orientations, i.e. (111), (110) and (100), the Gd2O3(100) is known from energetic point of view to be least favorable. Nonetheless, an enhancement in electron mobility can only be found from the interface between Gd2O3(100) and Si(100). Although p-type Si(100) results in the best structural considerations from x-ray diffraction among the three types of substrate, the best feature was observed in the Gd2O3(100)/n-type Si(100) because of its highest mobility enhancement and satisfactory structural stability. The mobility of 1670-1780 cm2/V·s was observed at room temperature, for carrier concentration > 1018cm-3. This amounts to a factor of four higher in electron mobility compared to a heavily doped n-type substrate with similar carrier concentration. This accumulation of electrons and mobility enhancement are attributed to two-dimensional confinement from charges transfer across the interface quite similar to modulation doping. Owing to these properties, the Gd2O3(100) becomes a promising candidate in promoting the scaling of logic devices.

Genre

doctoral dissertations

Subjects--Topics

Materials science
Electrical engineering

Degree

Ph.D.

Keywords

Gate Stack
High Dielectric Material
High Mobility
Polar Surface
Solid States

Subject Area

Optical Science and Engineering

Advisor(s)

Tsu, Raphael

Committee Members

Fiddy, Michael
Zhang, Yong
Lu, Na

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2012.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Sitaputra_uncc_0694D_10380

Permalink

http://hdl.handle.net/20.500.13093/etd:230