Abstract
We present a systematic investigation of free‐carrier screening in coupled asymmetric GaN quantum discs with embedded AlGaN barriers using time‐integrated and time‐resolved micro‐photoluminescence measurements, supported by three‐dimensional multi‐band k⋅p computational modeling. Free‐carrier screening effects decreased with the barrier thickness, which indicates that the source of the free‐carriers were carriers tunneling through the barrier.
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