Hole mobility and diffusion coefficient in strained and relaxed doped GexSi1-x alloys

Kaj Grahn, Ying Fu, Magnus Willander

Research output: Contribution to journalArticle

Abstract

We have calculated the hole mobility and diffusion coefficient in relaxed and strained GexSi1-x alloys grown on 001 Si, taking into account the detailed valence band structure. The acoustic phonon, non-polar optical phonon, alloy as well as ionized impurity scattering are included. Results are reported for Ge fractions varying from 0 to 100 percent, for lattice temperatures between 100 K and 500 K, and the doping concentration varies between 1013–1020 cm-3. Adopted valence band structures rely on the k p perturbation theory and include heavy, light and spin split-off bands. The calculations show that the light hole contribution to the total mobility can be dominant even if the corresponding band population is small. This is due to the small effective mass of the light hole. Calculations also show that the strained mobility components are significantly larger than the relaxed mobility components. The diffusion coefficient has a behavior similar to the total hole mobility.
Original languageEnglish
Pages (from-to)174-178
JournalPhysica Scripta
Issue numberT79
DOIs
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed

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