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We theoretically present the intrinsic limits to electron mobility in the modulation-doped Al Ga N/Ga N two-dimensional electron gas(2DEG) due to effects including acoustic deformation potential(DP)scattering, piezoelectric scattering(PE), and polar-optic phonon scattering(POP). We find that DE and PE are the more significant limiting factors at intermediate temperatures of 40 K to 250 K, while POP becomes dominant as room temperature is approached. Detailed numerical results are presented for the change of electron mobility with respect to temperature and carrier density. We conclude that these three types of phonon scattering, which are generally determined by the material properties but not the technical processing,are hard limits to the 2DEG mobility.
We theoretically present the intrinsic limits to electron mobility in the modulation-doped Al Ga N / Ga N two-dimensional electron gas (2DEG) due to effects including acoustic deformation potential (DP) scattering, piezoelectric scattering (PE) We found that DE and PE are more significantly limiting factors at intermediate temperatures of 40 K to 250 K, while POP numerical values are as dominant as room temperature is approached. Detailed numerical results are presented for the change of electron mobility with respect to temperature and carrier density. We conclude that these three types of phonon scattering, which are generally determined by the material properties but not the technical processing, are hard limits to the 2DEG mobility.