Saeta, Peter N. and Ferry, Vivian E. and Pacifici, Domenico and Munday, Jeremy N. and Atwater , Harry A. (2009) How much can guided modes enhance absorption in thin solar cells? Optics Express, 17 (23). pp. 20975-20990. ISSN 1094-4087 http://resolver.caltech.edu/CaltechAUTHORS:20091207-105511126
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Absorption enhancement in thin metal-backed solar cells caused by dipole scatterers embedded in the absorbing layer is studied using a semi-analytical approach. The method accounts for changes in the radiation rate produced by layers above and below the dipole, and treats incoherently the subsequent scattering of light in guided modes from other dipoles. We find large absorption enhancements for strongly coupled dipoles, exceeding the ergodic limit in some configurations involving lossless dipoles. An antireflection-coated 100-nm layer of a- Si:H on Ag absorbs up to 87% of incident above-gap light. Thin layers of both strong and weak absorbers show similar strongly enhanced absorption.
|Additional Information:||© 2009 Optical Society of America. Received 1 Sep 2009; revised 10 Oct 2009; accepted 11 Oct 2009; published 3 Nov 2009. This work was supported by Harvey Mudd College and the Department of Energy, under contract DE-FG02-07ER46405. We gratefully acknowledge useful discussions with L. A. Sweatlock.|
|Classification Code:||OCIS codes: (250.5403) Plasmonics; (130.0250) Optoelectronics; (160.3900) Materials: metals;(160.6000) Materials: semiconductor materials; (240.6680) Optics at surfaces: surface plasmons.|
|Official Citation:||Peter N. Saeta, Vivian E. Ferry, Domenico Pacifici, Jeremy N. Munday, and Harry A. Atwater, "How much can guided modes enhance absorption in thin solar cells?," Opt. Express 17, 20975-20990 (2009) http://www.opticsinfobase.org/abstract.cfm?URI=oe-17-23-20975|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||05 Jan 2010 00:27|
|Last Modified:||26 Dec 2012 11:36|
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