Influence of surface structure on the phonon-assisted emission process in the ZnO nanowires grown on homoepitaxial films

Woong-Ki Hong; Gunho Jo; Minhyeok Choe; Takhee Lee; Sohn, Jung Inn; Welland, Mark E.
January 2009
Applied Physics Letters;1/26/2009, Vol. 94 Issue 4, pN.PAG
Academic Journal
We carried out temperature-dependent photoluminescence measurements to investigate the influence of surface roughness on the phonon-assisted emission of the surface-tailored ZnO nanowires (NWs). For the rough ZnO NWs, the observation of strong defect emission with vibration peaks by the exciton-phonon coupling reflects the presence of a high density of surface defects, resulting in a rapid shift to lower energy region of free exciton emission and a strong contribution of the first order phonon-assisted free exciton in ultraviolet emission. This investigation indicates that the surface defects associated with roughness have a significant influence on the phonon-assisted exciton emission.


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