Comparison of optical properties of periodic photonic-plasmonic and randomly textured back reflectors for nc-Si solar cells

TitleComparison of optical properties of periodic photonic-plasmonic and randomly textured back reflectors for nc-Si solar cells
Publication TypeJournal Article
Year of Publication2012
AuthorsBhattacharya J, Chakravarty N, Pattnaik S, Slafer WD, Biswas R, Dalal V
Journal TitleJournal of Non-Crystalline Solids
Volume358
Pages2313-2318
Date Published09
Type of ArticleArticle; Proceedings Paper
ISBN Number0022-3093
Accession NumberWOS:000310394700092
KeywordsABSORPTION, Light trapping, Nano-crystalline silicon, Plasmonic enhancement
Abstract

Light trapping is essential to harvest long-wavelength red and near-infrared photons in thin film silicon solar cells. Light trapping in p-i-n thin film cells is commonly achieved with back-reflectors, and in n-i-p cells with textured front transparent conductors. We systematically compare the optical properties and performance of randomly roughened back reflectors with periodic plasmonic-photonic back-reflectors in p-i-n solar cells. The randomly textured back reflectors were prepared to have very high diffuse reflectance comparable to the state of the art. The periodic back reflectors of tapered nano-pillars/bumps show enhanced quantum efficiency and optical absorption over randomly structured back reflectors using the same solar cell architecture in nc-Si solar cells. The strong diffraction and light concentration in periodic back reflectors may be more beneficial than the light scattering offered by randomly textured back reflectors. (C) 2012 Elsevier B.V. All rights reserved.

URL<Go to ISI>://WOS:000310394700092
DOI10.1016/j.jnoncrysol.2011.12.108
Alternate JournalJ. Non-Cryst. Solids