凝聚态物理
电子迁移率
各向异性
声子
散射
杂质
散射率
玻尔兹曼方程
声子散射
电子
载流子散射
化学
物理
超导电性
量子力学
有机化学
作者
Youngho Kang,Karthik Krishnaswamy,Hartwin Peelaers,Chris G. Van de Walle
标识
DOI:10.1088/1361-648x/aa6f66
摘要
We perform first-principles calculations to investigate the electronic and vibrational spectra and the electron mobility of β-Ga2O3. We calculate the electron-phonon scattering rate of the polar optical phonon modes using the Vogl model in conjunction with Fermi's golden rule; this enables us to fully take the anisotropic phonon spectra of the monoclinic lattice of β-Ga2O3 into account. We also examine the scattering rate due to ionized impurities or defects using a Yukawa-potential-based model. We consider scattering due to donor impurities, as well as the possibility of compensation by acceptors such as Ga vacancies. We then calculate the room-temperature mobility of β-Ga2O3 using the Boltzmann transport equation within the relaxation time approximation, for carrier densities in the range from 1017 to 1020 cm-3. We find that the electron-phonon interaction dominates the mobility for carrier densities of up to 1019 cm-3. We also find that the intrinsic anisotropy in the mobility is small; experimental findings of large anisotropy must therefore be attributed to other factors. We attribute the experimentally observed reduction of the mobility with increasing carrier density to increasing levels of compensation, which significantly affect the mobility.
科研通智能强力驱动
Strongly Powered by AbleSci AI