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Laterally assembled nanowires for ultrathin broadband solar absorbers

Authors
Song, Kyung-DeokKempa, Thomas J.Park, Hong-GyuKim, Sun-Kyung
Issue Date
5-5월-2014
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v.22, no.9, pp.A992 - A1000
Indexed
SCIE
SCOPUS
Journal Title
OPTICS EXPRESS
Volume
22
Number
9
Start Page
A992
End Page
A1000
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/98541
DOI
10.1364/OE.22.00A992
ISSN
1094-4087
Abstract
We studied optical resonances in laterally oriented Si nanowire arrays by conducting finite-difference time-domain simulations. Localized Fabry-Perot and whispering-gallery modes are supported within the cross section of each nanowire in the array and result in broadband light absorption. Comparison of a nanowire array with a single nanowire shows that the current density (J(SC)) is preserved for a range of nanowire morphologies. The J(SC) of a nanowire array depends on the spacing of its constituent nanowires, which indicates that both diffraction and optical antenna effects contribute to light absorption. Furthermore, a vertically stacked nanowire array exhibits significantly enhanced light absorption because of the emergence of coupled cavity-waveguide modes and the mitigation of a screening effect. With the assumption of unity internal quantum efficiency, the J(SC) of an 800-nm-thick cross-stacked nanowire array is 14.0 mA/cm(2), which yields a similar to 60% enhancement compared with an equivalent bulk film absorber. These numerical results underpin a rational design strategy for ultrathin solar absorbers based on assembled nanowire cavities. (C)2014 Optical Society of America
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