Influence of surface morphology on the optical property of vertically aligned ZnO nanorods

Das, Sachindra Nath; Kar, Jyoti Prakash; Ji-Hyuk Choi; Byeon, S.; Jho, Y. D.; Jae-Min Myoung
September 2009
Applied Physics Letters;9/14/2009, Vol. 95 Issue 11, p111909
Academic Journal
In this letter we have studied an influence of surface morphology on the optical property of vertically aligned ZnO nanorods. At low temperature the near band edge excitonic emission shows a strong dependence on surface morphology. A prominent and well resolved near band edge photoluminescence (PL) peak was obtained for nanowires with decreasing diameter and thus assigned due to the contributions to the optical properties of individual nanorods. Depending on surface morphology, the difference in low temperature PL property is attributed to the tailing of the density of states due to the potential fluctuations in randomly distributed intrinsic defects.


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