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.
Bibliographical noteFunding Information:
This research was partly supported by WCU (World Class University) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology [R32-20031], the IT R&D program of MKE/IITA [2008-F-023-01], and Samsung Electronics Co. Ltd. [Grant No. 2008-8-2105].
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)