Sodium Acceptor Doping of ZnO Crystals

摘要

ZnO bulk single crystals were doped with sodium by thermal diffusion using sodium dispensers. Secondaryion mass spectrometry measurement shows the diffusion of sodium with concentration~1×1018 cm~(-3) in near surface region. Photoluminescence (PL) measurements show donor acceptor pair (DAP) emission at 408 nm at room temperature which exhibits a blue-shift to 404 nm at 9 K. DC Hall measurements show the mixed conduction due to low Hall voltage in these samples. PL measurements and variable temperature resistivity measurements suggest that the sodium acceptor activation energy is~0.300 eV.