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Optimization towards high density quantum dots for intermediate band solar cells grown by molecular beam epitaxy

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5 Author(s)
Zhou, D. ; Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway ; Sharma, G. ; Thomassen, S.F. ; Reenaas, T.W.
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We report high density quantum dots (QDs) formation with optimized growth temperature and V/III ratio. At lower growth temperature, QD density is increased, due to smaller surface migration length of In adatoms. With higher V/III, the QD density is higher but it results in large clusters formation and decreases the QD uniformity. The QD solar cell was fabricated and examined. An extended spectral response in contrast to the GaAs reference cell was presented but the external quantum efficiency at energies higher than GaAs band gap is reduced, resulting from the degradation for the emitter above the strained QD layers.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 6 )

Date of Publication:

Feb 2010

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