Journal
OPTICS EXPRESS
Volume 22, Issue 13, Pages A1174-A1189Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.0A1174
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Funding
- European commission [257375]
- Grenoble-INP via a Bonus Qualite Recherche grant through the project CELESTE
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The absorption properties of ZnO nanowire arrays covered with a semiconducting absorbing shell for extremely thin absorber solar cells are theoretically investigated by optical computations of the ideal short-circuit current density with three-dimensional rigorous coupled wave analysis. The effects of nanowire geometrical dimensions on the light trapping and absorption properties are reported through a comprehensive optical mode analysis. It is shown that the high absorptance of these heterostructures is driven by two different regimes originating from the combination of individual nanowire effects and nanowire arrangement effects. In the short wavelength regime, the absorptance is likely dominated by optical modes efficiently coupled with the incident light and interacting with the nearby nanowires (i. e. diffraction), induced by the period of core shell ZnO nanowire arrays. In contrast, in the long wavelength regime, the absorptance is governed by key optically guided modes, related to the diameter of individual core shell ZnO nanowires. (C) 2014 Optical Society of America
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