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Title: Diffraction Grating Structures in Solar Cells

Abstract

Sub-wavelength periodic texturing (gratings) of crystalline-silicon (c-Si) surfaces for solar cell applications can be designed for maximizing optical absorption in thin c-Si films. We have investigated c-Si grating structures using rigorous modeling, hemispherical reflectance, and internal quantum efficiency measurements. Model calculations predict almost {approximately}100% energy coupling into obliquely propagating diffraction orders. By fabrication and optical characterization of a wide range of 1D & 2D c-Si grating structures, we have achieved broad-band, low ({approximately} 5%) reflectance without an anti-reflection film. By integrating grating structures into conventional solar cell designs, we have demonstrated short-circuit current density enhancements of 3.4 and 4.1 mA/cm{sup 2} for rectangular and triangular 1D grating structures compared to planar controls. The effective path length enhancements due to these gratings were 2.2 and 1.7, respectively. Optimized 2D gratings are expected to have even better performance.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
771530
Report Number(s):
SAND2000-3057C
TRN: AH200118%%538
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: IEEE Photovoltaic Specialists Conference, Anchorage, AK (US), 09/17/2000--09/22/2000; Other Information: PBD: 1 Dec 2000
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; ABSORPTION; CURRENT DENSITY; DIFFRACTION; DIFFRACTION GRATINGS; FABRICATION; PERFORMANCE; QUANTUM EFFICIENCY; SOLAR CELLS

Citation Formats

ZAIDI,SALEEM H., GEE,JAMES M., and RUBY,DOUGLAS S.. Diffraction Grating Structures in Solar Cells. United States: N. p., 2000. Web.
ZAIDI,SALEEM H., GEE,JAMES M., & RUBY,DOUGLAS S.. Diffraction Grating Structures in Solar Cells. United States.
ZAIDI,SALEEM H., GEE,JAMES M., and RUBY,DOUGLAS S.. Fri . "Diffraction Grating Structures in Solar Cells". United States. doi:. https://www.osti.gov/servlets/purl/771530.
@article{osti_771530,
title = {Diffraction Grating Structures in Solar Cells},
author = {ZAIDI,SALEEM H. and GEE,JAMES M. and RUBY,DOUGLAS S.},
abstractNote = {Sub-wavelength periodic texturing (gratings) of crystalline-silicon (c-Si) surfaces for solar cell applications can be designed for maximizing optical absorption in thin c-Si films. We have investigated c-Si grating structures using rigorous modeling, hemispherical reflectance, and internal quantum efficiency measurements. Model calculations predict almost {approximately}100% energy coupling into obliquely propagating diffraction orders. By fabrication and optical characterization of a wide range of 1D & 2D c-Si grating structures, we have achieved broad-band, low ({approximately} 5%) reflectance without an anti-reflection film. By integrating grating structures into conventional solar cell designs, we have demonstrated short-circuit current density enhancements of 3.4 and 4.1 mA/cm{sup 2} for rectangular and triangular 1D grating structures compared to planar controls. The effective path length enhancements due to these gratings were 2.2 and 1.7, respectively. Optimized 2D gratings are expected to have even better performance.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2000},
month = {Fri Dec 01 00:00:00 EST 2000}
}

Conference:
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