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Absorption characteristics of a quantum dot array induced intermediate band: implications for solar cell design

By Stanko Tomić, T. S. (Tim S.) Jones and Nicholas (Nicholas M.) Harrison

Abstract

We present a theoretical study of the electronic and absorption properties of the intermediate band (IB) formed by a three dimensional structure of InAs/GaAs quantum dots (QDs) arranged in a periodic array. Analysis of the electronic and absorption structures suggests that the most promising design for an IB solar cell material, which will exhibit its own quasi-Fermi level, is to employ small QDs (~6–12 nm QD lateral size). The use of larger QDs leads to extension of the absorption spectra into a longer wavelength region but does not provide a separate IB in the forbidden energy gap

Topics: QC
Publisher: American Institute of Physics
Year: 2008
OAI identifier: oai:wrap.warwick.ac.uk:946

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