Speaker
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
No
Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)
Yes
Main supervisor (name and email)<br>and his / her institution
Professor Reinhardt Botha, Reinhardt.Botha@nmmu.ac.za, Nelson Mandela Metropolitan University.
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
PhD
Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
The size distribution and growth conditions of self-assembled InSb quantum dots (QDs) on a GaSb substrate (2° off (100)) using different V/III ratios were investigated. The QDs were grown using atmospheric pressure MOVPE and a growth temperature of 425°C. Scanning electron microscopy (SEM) of the uncapped QDs revealed that their dimensions ranged from 10 nm to 60 nm in diameter. A scanning probe microscopy (SPM) analysis of the uncapped QDs showed a bimodal size distribution of QDs on the misoriented surface of the substrate and confirmed a reduction in dot density and diameter as the V/III ratio increased from 1 to 3. Also from SPM, the heights of the QDs were determined to range from 5 nm to 19 nm. The experimental results confirm that the V/III ratio affects the size distribution and density of the QDs, which can be attributed to a change in the surface migration length of the indium species during deposition.
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
