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In doping and incorporation in the barrier layers of AlGaAs/GaAs double-barrier resonant tunnelling structures (DBRTSs) have been studied. It was found that the peak-to-valley current ratio (PVCR) can be improved by the proper amount of In doping. This is attributed to the improvement in the quality of the AlGaAs barrier layers due to the high surface migration rate of In atoms that reduces group...
Periodic interruption of Ga flux during MBE growth of GaAs has been used to achieve sustained two-dimensional layer-by-layer growth. RHEED intensity oscillation for extended growth shows no degradation in the oscillation amplitude, indicating an atomically smooth growth front throughout the growth.<<ETX>>
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