Abstract
By using two-photon excitation spectroscopy we take advantage of the increased spatialresolution to perform time-integrated and time-resolved photoluminescence measurementson several discrete stacks of GaN quantum discs. The stack structure consisted of coupledasymmetric GaN quantum discs with embedded AlGaN barriers, which were grown at thetip of a GaN nanocolumn. We observed that with increasing optical excitation power thecarrier lifetime decreased due to free-carrier screening, with an enhancement of thescreening effect in the larger quantum disc due to carrier tunnelling from the smallerquantum disc.
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