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Quantum dot solar cells (QDSCs) comprised of 10 stacked pairs of strain-compensated InGaAs/GaNAs QD structure have been fabricated by atomic hydrogen assisted molecular beam epitaxy (H-MBE). A 3 dimensionally well ordered InGaAs QD array structure with a total density of ~1012 cm-2 has been achieved on GaAs (311)B substrate. The external quantum efficiencies of InGaAs/GaNAs QDSCs increase in the longer...
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