Original Publication Date
Applied Physics Letters
DOI of Original Publication
Date of Submission
The authors compare the surface and optical properties of the Zn-polar (0001) and O-polar (0001¯)surfaces of bulk ZnO samples. For optical characterization, steady-state photoluminescence using a He–Cd laser was measured at 15 and 300K. At room temperature, the (0001¯)surface demonstrates nearly double the near-band-edge emission intensity seen for the (0001) surface. Using scanning Kelvin probe microscopy, the authors have measured surface contact potentials of 0.39±0.05 and 0.50±0.05V for the (0001) and (0001¯)surfaces, respectively. The resulting small difference in band bending for these two surfaces indicates that charge transfer between the surfaces is not a dominant stabilizing mechanism. Conductive atomic force microscopy studies show enhanced reverse-bias conduction in localized regions on the (0001¯) vs (0001) surface. The differences in surface conduction and band bending between the two polar surfaces can be attributed to their chemical interactions with hydrogen and water in the ambient.
Chevtchenko, S.A., Moore, J.C., Özgür, Ü., et al. Comparative study of the (0001) and (0001¯) surfaces of ZnO. Applied Physics Letters, 89, 182111 (2006). Copyright © 2006 AIP Publishing LLC.
Is Part Of
VCU Electrical and Computer Engineering Publications