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Ultradense, Deep Subwavelength Nanowire Array Photovoltaics As Engineered Optical Thin Films

Tham, Douglas and Heath, James R. (2010) Ultradense, Deep Subwavelength Nanowire Array Photovoltaics As Engineered Optical Thin Films. Nano Letters, 10 (11). pp. 4429-4434. ISSN 1530-6984. http://resolver.caltech.edu/CaltechAUTHORS:20101206-111639285

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Abstract

A photovoltaic device comprised of an array of 20 nm wide, 32 nm pitch array of silicon nanowires is modeled as an optical material. The nanowire array (NWA) has characteristic device features that are deep in the subwavelength regime for light, which permits a number of simplifying approximations. Using photocurrent measurements as a probe of the absorptance, we show that the NWA optical properties can be accurately modeled with rigorous coupled-wave analysis. The densely structured NWAs behave as homogeneous birefringent materials into the ultraviolet with effective optical properties that are accurately modeled using the dielectric functions of bulk Si and SiO_2, coupled with a physical model for the NWA derived from ellipsometry and transmission electron microscopy.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nl102199b DOIArticle
http://pubs.acs.org/doi/full/10.1021/nl102199bPublisherArticle
ORCID:
AuthorORCID
Heath, James R.0000-0001-5356-4385
Additional Information:© 2010 American Chemical Society. Received for review: 06/22/2010. Published on Web: 10/08/2010. This work was funded by the Department of Energy (DE-FG02-04ER46175). D.T. gratefully acknowledges support by the KAUST Scholar Award. Minority carrier diffusion length measurements were made at the Molecular Materials Research Center of the Beckman Institute, while FIB lift-out and TEM imaging were performed in the Kavli Nanoscience Institute, both at the California Institute of Technology.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-04ER46175
King Abdullah University of Science and Technology (KAUST)UNSPECIFIED
Subject Keywords:Silicon; nanowire; photovoltaic; birefringence
Record Number:CaltechAUTHORS:20101206-111639285
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101206-111639285
Official Citation:Ultradense, Deep Subwavelength Nanowire Array Photovoltaics As Engineered Optical Thin Films Douglas Tham, James R. Heath Nano Letters 2010 10 (11), 4429-4434
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21184
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Dec 2010 18:07
Last Modified:25 Apr 2017 04:56

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