A numerical study of Bi-periodic binary diffraction gratings for solar cell applications

Mellor Null, Alexander Virgil and Tobías Galicia, Ignacio and Martí Vega, Antonio and Luque López, Antonio (2011). A numerical study of Bi-periodic binary diffraction gratings for solar cell applications. "Solar energy materials and solar cells", v. 95 (n. 12); pp. 3527-3535. ISSN 0927-0248. https://doi.org/10.1016/j.solmat.2011.08.017..

Description

Title: A numerical study of Bi-periodic binary diffraction gratings for solar cell applications
Author/s:
  • Mellor Null, Alexander Virgil
  • Tobías Galicia, Ignacio
  • Martí Vega, Antonio
  • Luque López, Antonio
Item Type: Article
Título de Revista/Publicación: Solar energy materials and solar cells
Date: December 2011
ISSN: 0927-0248
Volume: 95
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In this paper, a numerical study is made of simple bi-periodic binary diffraction gratings for solar cell applications. The gratings consist of hexagonal arrays of elliptical towers and wells etched directly into the solar cell substrate. The gratings are applied to two distinct solar cell technologies: a quantum dot intermediate band solar cell (QD-IBSC) and a crystalline silicon solar cell (SSC). In each case, the expected photocurrent increase due to the presence of the grating is calculated assuming AM1.5D illumination. For each technology, the grating period, well/tower depth and well/tower radii are optimised to maximise the photocurrent. The optimum parameters are presented. Results are presented for QD-IBSCs with a range of quantum dot layers and for SSCs with a range of thicknesses. For the QD-IBSC, it is found that the optimised grating leads to an absorption enhancement above that calculated for an ideally Lambertian scatterer for cells with less than 70 quantum dot layers. In a QD-IBSC with 50 quantum dot layers equipped with the optimum grating, the weak intermediate band to conduction band transition absorbs roughly half the photons in the corresponding sub-range of the AM1.5D spectrum. For the SSC, it is found that the optimised grating leads to an absorption enhancement above that calculated for an ideally Lambertian scatterer for cells with thicknesses of 10 ?m or greater. A 20um thick SSC equipped with the optimised grating leads to an absorption enhancement above that of a 200um thick SSC equipped with a planar back reflector.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7211640IBPOWERUnspecifiedIntermediate Band Materials and Solar Cells for Photovoltaics with High Efficiency and Reduced Cost

More information

Item ID: 10832
DC Identifier: http://oa.upm.es/10832/
OAI Identifier: oai:oa.upm.es:10832
DOI: 10.1016/j.solmat.2011.08.017.
Official URL: http://www.sciencedirect.com/science/article/pii/S0927024811004752
Deposited by: Memoria Investigacion
Deposited on: 08 May 2012 08:53
Last Modified: 03 Nov 2014 13:17
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