AVS 52nd International Symposium
    Nanometer-Scale Science and Technology Thursday Sessions
       Session NS-ThA

Paper NS-ThA5
Fabrication and Characterization of ZnO Quantum Dots and Nanosheet Structure

Thursday, November 3, 2005, 3:20 pm, Room 210

Session: Nano Processing
Presenter: R. Mu, Fisk University
Authors: R. Mu, Fisk University
Y.C. Liu, Northeast Normal University, PRC
H.Y. Xu, Northeast Normal University, PRC
S.J. Chen, Northeast Normal University, PRC
Correspondent: Click to Email
ZnO quantum dots and nanosheets have been fabricated via oxygen plasma assisted electron-beam deposition of ZnF2 and physical vapor transport techniques. Raman measurements of ZnO QDs showed a strong optical phonon confinement effect and the presence of surface phonon mode which does not exist in Raman spectra of ZnO films. A large blueshift in optical absorption and ultraviolet photoluminescence (UV PL) spectra were observed for ZnO QDs due to a strong quantum confinement effect of excitons. ZnO QDs posses an anomalous temperature dependent behavior in UV PL intensity. In the case of nanosheet, temperature dependent study show a surprisingly strong high temperature (857K) photon emission A brief discussion is given in an attempt to understand the physical mechanisms.