Küppers, Franko and Sirkeli, Vadim P. and Yilmazoglu, Oktay and Al-Daffaie, Shihab and Oprea, Ion and Ong, Duu Sheng and Hartnagel, Hans L (2018):
Internal Quantum Efficiency Enhancement of InGaN/GaN LEDs WITH Mg-Si pin-Doped GaN Quantum Barrier.
In: 9th International Conference on Materials Science and Condensed Matter Physics, Chisinau, Moldova, pp. 1-4, [Conference or Workshop Item]

Sirkeli, Vadim P. and Yilmazoglu, Oktay and Al-Daffaie, Shihab and Oprea, Ion and Ong, Duu Sheng and Küppers, Franko and Hartnagel, Hans L. (2017):
Resonant tunneling transport in Zn x Be 1-x Se/ZnSe/Zn y Be 1-y Se asymmetric quantum structures.
10248In: Nanotechnology VIII, p. 1024811, [Conference or Workshop Item]

Sirkeli, Vadim P. and Yilmazoglu, Oktay and Al-Daffaie, Shihab and Oprea, Ion and Ong, Duu Sheng and Küppers, Franko and Hartnagel, Hans L. (2016):
Efficiency enhancement of InGaN/GaN light-emitting diodes with pin-doped GaN quantum barrier.
In: Journal of Physics D: Applied Physics, 50 (3), IOP Publishing, pp. 035108, [Article]