Oxygen effect on the conductivity of the Cu OrZnO 0001/and x 0001/systems

Thin copper oxide film formation on the polar ZnO 0001.and ZnO 0001.surfaces under ultra-high vacuum conditions was monitored by LEED, Auger, TCS and work-function measurements. The 2.5 nm thick discontinuous oxide films contained a mixture of CuO, Cu2O and ZnO. The effect of oxygen gas on the conductivity of the thin films has been measured, and a more pronounced increase of a relative resistance of the film is observed in the temperature range 400–500 K. q1999 Elsevier Science B.V. All rights reserved