Boyall, N.M. and Durose, K. and Watson, I.M. (2003) A method of normalizing cathodoluminescence images of electron transparent foils for thickness contrast applied to InGaN quantum wells. Journal of Microscopy, 209 (1). pp. 41-46. ISSN 0022-2720Full text not available in this repository. (Request a copy from the Strathclyde author)
The uniformity of panchromatic cathodoluminescence (CL) from In0.09Ga0.91N/GaN quantum wells at 100 K was investigated using a combined transmission electron microscope-cathodoluminescence instrument. A technique for correcting CL images of electron-transparent wedge specimens for thickness contrast artefacts is presented. The foil thickness was estimated using the dynamical formulation of the relationship between the thickness and the (experimentally observed) transmitted electron intensity. For a given thickness the CL intensity was calculated using the Everhart-Hoff depth-dose function and also taking into account surface recombination losses. Experimental CL images were normalized by dividing by the calculated CL value at each point. The procedure was successful in calculating the underlying materials contrast in CL images of thin specimens of InGaN single quantum wells. Non-uniformities in the CL emission on the scale of similar to0.7 mum were observed.
|Keywords:||cathodoluminescence, InGaN quantum wells, thickness normalization, transmission electron microscopy, Optics. Light, Pathology and Forensic Medicine, Histology|
|Subjects:||Science > Physics > Optics. Light|
|Department:||Faculty of Science > Physics > Institute of Photonics|
|Depositing user:||Strathprints Administrator|
|Date Deposited:||28 Jan 2008|
|Last modified:||13 May 2016 03:43|