High mobility SiGe heterostructures fabricated by low-energy plasma-enhanced chemical vapor deposition

von Kanel, H.; Chrastina, D.; Roessner, B.; Isella, G.; Hague, J.P. and Bollani, M. (2004). High mobility SiGe heterostructures fabricated by low-energy plasma-enhanced chemical vapor deposition. Microelectronic Engineering, 76(1-4) pp. 279–284.

DOI: https://doi.org/10.1016/j.mee.2004.07.029

Abstract

We present results obtained on modulation-doped quantum wells with compressively strained Ge channels. The heterostructures have been grown by low-energy plasma-enhanced chemical vapor deposition (LEPECVD). Magnetotransport measurements were carried out both on van der Pauw squares and lithographically defined Hall bars. The 2 K hole mobility increases with sheet density, and exceeds 10⁵ cm² V⁻¹ s⁻¹ below 40 K for carrier densities above 8 × 10¹¹ cm⁻². It is dominated by remote impurity scattering, according to linear transport theory calculations. The same conclusion follows from the Dingle ratios of 5–10 derived from the low-field longitudinal magnetoresistance. Room-temperature channel mobilities were extracted from the magnetic field dependence of longitudinal and transverse magnetoresistance by means of mobility spectrum analysis. We obtained 2940 cm² V⁻¹ s⁻¹ at a sheet hole density of 5.7 × 10¹¹ cm⁻².

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