Raman Spectroscopy on Lithium Doped ZnO Nanocrystals
Proceedings of the German Physical Society, Dresden, Germany, 22 - 27 March 2009, pp.2, (Full Text)
- Publication Type: Conference Paper / Full Text
- City: Dresden
- Country: Germany
- Page Numbers: pp.2
- Akdeniz University Affiliated: Yes
Abstract
ZnO still receives much attention due to its possible application for field
emission displays, high frequency electronic devices, short wavelength
lasers or light emitting diodes. But there is still a lack of knowledge in
terms of p-doping of ZnO. Over the past years, Lithium revealed to be a
good candidate for shallow acceptors. So far ZnO:Li has been investigated
by many methods in different groups. However, there is only little
knowledge about the influence of Li doping to the vibrational properties of
ZnO. Recently Yadav et al. (JAP 104, 053507) reported about low energy
Raman modes below 200 1/cm and a high energy mode around 1090
1/cm. They attributed them to zone boundary phonons and a resonant
second order mode, respectively. In this contribution a detailed analysis of
these Raman modes in ZnO:Li nanocrystals with different Li incorporation
will be presented. We will show that these modes already appear at very
low Li concentrations. According to the 1090 1/cm line, a dependence of
the intensity on the Li incorporation can be seen. Furthermore excitation
dependant Raman measurements will be presented. To complete our
investigations photoluminescence measurements have been performed.
Thereby no dependency between exciton energy and Li incorporation can
be seen.