Acceptor States in Boron Doped SiGe Quantum Wells
CALIFORNIA UNIV LOS ANGELES
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The temperature dependences of lateral conductivity and hole mobility in SiGe quantum well structures selectively doped with boron are presented. The boron A centers are found to exist and determine the low temperature conductivity. The activation energy of conductivity at higher temperatures is shown to be determined by the energy distance between strain split boron A0 levels. The model of two-stage excitation of free holes including the thermal activation of holes from the ground to split-off state and next tunneling into the valence band is proposed. The binding energy of A centers and the energy splitting of boron ground states by strain are found.
- Solid State Physics