Solar energy harnessing in hexagonally arranged Si nanowire arrays and effects of array symmetry on optical characteristics
- 27 April 2012
- journal article
- Published by IOP Publishing in Nanotechnology
- Vol. 23 (19), 194010
- https://doi.org/10.1088/0957-4484/23/19/194010
Abstract
Investigation of solar energy harvesting in hexagonally arranged Si nanowire (NW) arrays is performed through optimizing the structural parameters, such as array periodicity (P), Si NW diameter (D) and length (L). The results demonstrate that there exist wide P and D/P 'windows' for the Si NW arrays, locating around 600 nm and 0.833 (i.e., D=500 nm), respectively, for achieving enhanced light absorption compared to their thin film counterparts with the same thickness, but with much less materials consumption. Calculation of the ultimate efficiency (UE) indicates that the light trapping capability is not monotonically increased with L, and that UE vibration is found when L is >1000 nm. Comparison of the light absorption spectra for hexagonally and squarely arranged Si NW arrays demonstrates that these two most widely employed array symmetries in practice have little impact on the light trapping capability.Keywords
This publication has 29 references indexed in Scilit:
- Nanorod solar cell with an ultrathin a-Si:H absorber layerApplied Physics Letters, 2011
- Optical absorption enhancement in disordered vertical silicon nanowire arrays for photovoltaic applicationsOptics Letters, 2010
- Erratum: Enhanced absorption and carrier collection in Si wire arrays for photovoltaic applicationsNature Materials, 2010
- Si nanopillar array optimization on Si thin films for solar energy harvestingApplied Physics Letters, 2009
- Silicon Nanowire Radial p−n Junction Solar CellsJournal of the American Chemical Society, 2008
- Silicon nanowire solar cellsApplied Physics Letters, 2007
- Analysis of Optical Absorption in Silicon Nanowire Arrays for Photovoltaic ApplicationsNano Letters, 2007
- Coaxial silicon nanowires as solar cells and nanoelectronic power sourcesNature, 2007
- Comparison of the device physics principles of planar and radial p-n junction nanorod solar cellsJournal of Applied Physics, 2005
- Reflection properties of nanostructure-arrayed silicon surfacesNanotechnology, 2000