UNSPECIFIED (1997) Study of Hall and effective mobilities in pseudomorphic Si1-xGex p-channel metal-oxide-semiconductor field-effect transistors at room temperature and 4.2 K. JOURNAL OF APPLIED PHYSICS, 82 (10). pp. 5210-5216. ISSN 0021-8979

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Abstract

A study of several Si0.8Ge0.2 p-channel heterostructures with self-aligned poly-Si metal-oxide-semiconductor gates were carried out. A novel fabrication process was developed which is compatible with the strained Si/SiGe system, and it has allowed Hall and resistivity measurements to be performed at room temperature and at 4.2 K. The structures were numerically modelled to calculate the charge distribution with temperature and with gate voltage and the results have shown good agreement with experiment, Hall measurements at 4.2 K have shown consistent Sice channel Hall mobility enhancements of x3 over the SiO2/Si channels in the same devices. Room temperature effective mobilities were measured for a buried Si0.8Ce0.2. p-channel metal-oxide-semiconductor field-effect transistor heterostructure using capacitance-voltage measurements to calculate the carrier density. Mobilities are consistently over 300 cm(2)/V s and the low temperature studies, together with measurements of comparable modulation doped heterostructures, and secondary-ion-mass spectroscopy depth profiles suggest that this mobility is at present limited by the quality and proximity of the SiO2/Si interface. (C) 1997 American Institute of Physics.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF APPLIED PHYSICS
Publisher:	AMER INST PHYSICS
ISSN:	0021-8979
Date:	15 November 1997
Volume:	82
Number:	10
Number of Pages:	7
Page Range:	pp. 5210-5216
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/16235

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