Broadband enhancement of optical absorption in a silicon nanowire flexible thin film
- Authors
- Jung, Jin-Young; Zhou, Keya; Lee, Jung-Ho
- Issue Date
- Nov-2014
- Publisher
- Elsevier Sequoia
- Keywords
- Silicon; Nanowires; Optical absorption; Thin films; Surface plasmon polariton
- Citation
- Thin Solid Films, v.570, pp.75 - 80
- Indexed
- SCIE
SCOPUS
- Journal Title
- Thin Solid Films
- Volume
- 570
- Start Page
- 75
- End Page
- 80
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/21448
- DOI
- 10.1016/j.tsf.2014.09.018
- ISSN
- 0040-6090
- Abstract
- A silicon nanowire (SiNW) array was embedded into a polydimethylsiloxane matrix to fabricate a flexible thin film solar cell in which a rugged metallic back surface was formed at the bottom. Superior light scattering of the randomly arrayed SiNWs significantly improved the light absorptance in a short wavelength region (lambda<700 nm). The rugged morphology of metallic back surface excited the surface plasmon polaritons (SPPs) along the interface between the metal and Si, which showed a plasmonic potential to enhance light absorption in a longwavelength region (lambda> 700nm). This featurewas attributed to the threemajor routes for light trapping: back reflection, SPP resonance, and SPP scattering. This nanowire thin film showing the rugged back surface yielded the light absorption of similar to 92.6% using only similar to 5% of silicon required for conventional crystalline solar cells. (C) 2014 Elsevier B.V. All rights reserved.
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