Production and annealing of electron irradiation damage in ZnO

High-energy (> 1.6 MeV) electrons create acceptors and donors in single-cry stal ZnO. Greater damage is observed for irradiation in the [0001] directio n (Zn face) than in the [000 (1) over bar] direction (O face). The major an nealing stage occurs at about 300-325 degrees C, and is much sharper for de fects produced by Zn-face irradiation, than for those resulting from O-face irradiation. The defects appear to have a chain character, rather than bei ng simple, near-neighbor vacancy/interstitial Frenkel pairs. These experime nts suggest that ZnO is significantly more "radiation hard" than Si, GaAs, or GaN, and should be useful for applications in high-irradiation environme nts, such as electronics in space satellites. (C) 1999 American Institute o f Physics. [S0003-6951(99)04232-1].