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Title:
 
Broadband Absorption Enhancements Using Scattering Al Nanoparticle Arrays
 
Author(s):
 
N. Hylton, X. Li, V. Giannini, K.-H. Lee, N.J. Ekins-Daukes, J. Loo, D. Vercruysse, P. Van Dorpe, H. Sodabanlu, M. Sugiyama, S.A. Maier
 
Keywords:
 
Light Trapping, Nanoparticle, Absorption
 
Topic:
 
MATERIAL STUDIES, NEW CONCEPTS, ULTRA-HIGH EFFICIENCY AND SPACE TECHNOLOGY
Subtopic: New Materials and Concepts for Cells
Event: 28th European Photovoltaic Solar Energy Conference and Exhibition
Session: 1AP.1.4
 
Pages:
 
11 - 13
ISBN: 3-936338-33-7
Paper DOI: 10.4229/28thEUPVSEC2013-1AP.1.4
 
Price:
 
 
0,00 EUR
 
Document(s): paper, presentation
 

Abstract/Summary:


Scattering nanoparticles of Au and Ag have been shown to provide absorption enhancements in solar cells at wavelengths longer than ~550 nm. However these systems typically suffer from losses at short wavelengths due to parasitic absorption in the metal. In this paper we show that the choice of scattering material is crucial to minimize parasitic losses and achieve broadband absorption enhancements. To this end we present the results of an experimental comparison of GaAs photodiodes with periodic arrays of Au, Ag and Al nanoparticles fabricated on the front surface. In particular, we demonstrate that by using Al nanoparticle arrays the optical absorption can be enhanced across a spectral range from 400 – 900 nm leading to an integrated external quantum efficiency enhancement of more than 20 %. Our results are supported by comprehensive 3D electromagnetic and electrical simulations that provide an insight into the underlying physics, demonstrating that the electric field penetration into Al is significantly lower than that of Au and Ag, hence reducing parasitic absorption.