Cathodoluminescence hyperspectral imaging of nitride core-shell structures

Edwards, P. R. and Le Boulbar, E. D. and Shields, P. A. and Allsopp, D. W. E. and Martin, R. W. (2014) Cathodoluminescence hyperspectral imaging of nitride core-shell structures. In: Condensed Matter in Paris 2014 (CMD25-JMC14), 2014-08-24 - 2014-08-29.

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In this work, we demonstrate the use of hyperspectral CL in the evaluation of periodic arrays of GaN/InxGa1-xN core-shell nanorods. These were fabricated using a top-down approach, in which columns are formed from a GaN template using nano-imprint lithography and ICP etching, followed by MOCVD regrowth [2]. The formation of quantum wells (QWs) on the mplane sidewall facets offers a route to avoiding the detrimental electric fields associated with LEDs grown on the c-plane, while the use of periodic features has the potential to improve light extraction and directionality.