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Impurity Complexes And Conductivity Of Ga-Doped Zno, D. O. Demchenko, B. Earles, H. Y. Liu, Vitaliy Avrutin, N. Izyumskaya, Ü. Özgür, Hadis Morkoç

Physics Publications

Using hybrid functional theory together with experimental measurements, we investigate the influence of gallium impurities and their complexes on electrical properties of ZnO. In contrast to the behavior of isolated Ga impurities and native defects, the calculated formation energies of Ga complexes are consistent with our experimental data. We show that for high levels of Ga doping the acceptor behavior of GaZn-VZn and GaZn-Oi complexes explains the conductivity measurements and compensation levels in ZnO. The computed binding energies of these complexes are also consistent with the binding energies obtained from the measurements of the temperature dependence of carrier mobility. Our …