Abstract
p-type ZnO:N thin films were prepared by thermal oxidation of RF magnetron sputtered Zn3N2 films on glass substrates. The
effects of oxidation temperature on the structural, optical and electrical properties of the samples were investigated by X-ray
diffraction (XRD), scanning electron microscopy (SEM), optical transmittance, photoluminescence (PL) and Hall effect
measurements. XRD analyses revealed that Zn3N2 films entirely transformed into ZnO:N films after annealing Zn3N2 films in
oxygen at 500 oC for 2 hours. Hall effect measurements confirmed p-type conduction in ZnO:N films with a low resistivity of 4.8
Ω×cm, a high hole concentration of 9.6´1018 cm-3 and a Hall mobility of 2.1 cm2/Vs. the films are highly transparent in the
visible region and the absorption edge blue shifts with increasing oxidation temperature from 450 – 550 oC. The films exhibited
strong excitonic UV emission and weak deep-level emission. Our results demonstrate a promising approach to fabricate low
resistivity p-type ZnO with high hole concentration.
Keywords
p-type ZnO films, RF magnetron sputtering, XRD, Photoluminescence.
Citation
ZHANG JUN, SHAO LE-XI, p-type ZnO nano-thin films prepared by oxidation of Zn3N2 deposited by rf magnetron sputtering, Optoelectronics and Advanced Materials - Rapid Communications, 3, 7, July 2009, pp.676-679 (2009).
Submitted at: May 22, 2008
Accepted at: July 20, 2009