A photonic-plasmonic structure for enhancing light absorption in thin film solar cells

TitleA photonic-plasmonic structure for enhancing light absorption in thin film solar cells
Publication TypeJournal Article
Year of Publication2011
AuthorsBhattacharya J, Chakravarty N, Pattnaik S, Slafer WD, Biswas R, Dalal VL
Journal TitleApplied Physics Letters
Volume99
Pages131114
Date Published09
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberWOS:000295618000014
KeywordsENHANCEMENT, light absorption, microcrystalline silicon, nanowire, optical-absorption, phonon-plasmon interactions, photoconductivity, reflectivity, silicon, silver, solar cells, zinc compounds
Abstract

We describe a photonic-plasmonic nanostructure, for significantly enhancing the absorption of long-wavelength photons in thin-film silicon solar cells, with the promise of exceeding the classical 4n(2) limit for enhancement. We compare identical solar cells deposited on the photonic-plasmonic structure, randomly textured back reflectors and silver-coated flat reflectors. The state-of-the-art back reflectors, using annealed Ag or etched ZnO, had high diffuse and total reflectance. For nano-crystalline Si absorbers with comparable thickness, the highest absorption and photo-current of 21.5 mA/cm(2) was obtained for photonic-plasmonic back-reflectors. The periodic photonic plasmonic structures scatter and reradiate light more effectively than a randomly roughened surface. (C) 2011 American Institute of Physics. [doi:10.1063/1.3641469]

DOI10.1063/1.3641469
Alternate JournalAppl. Phys. Lett.