Enhancement of solar cells with photonic and plasmonic crystals - overcoming the Lambertian limit

TitleEnhancement of solar cells with photonic and plasmonic crystals - overcoming the Lambertian limit
Publication TypeJournal Article
Year of Publication2013
AuthorsBiswas R, Pattnaik S, Xu C, Bhattacharya J, Chakravarty N, Dalal V
Journal TitleJournal of Materials Research
Volume28
Pages1021-1030
Date Published04
Type of ArticleArticle
ISBN Number0884-2914
Accession NumberWOS:000317587600002
KeywordsABSORPTION, EFFICIENCY
Abstract

Red and near-infrared photons of longer wave lengths are poorly absorbed in thin film silicon cells and advanced light trapping methods are necessary. The physical mechanisms underlying the light trapping using periodic back reflectors are strong light diffraction, coupled with plasmonic light concentration. These are contrasted with the scattering mechanisms in randomly textured back reflectors. We describe a class of conformal solar cells with nanocone back reflectors with absorption at the Lambertian 4n(2) limit, averaged over the "entire" wave length range for hydrogenated nanocrystalline silicon (nc-Si:H) thin-film solar cells. The absorption is theoretically found for 1-mu m nc-Si:H cells, and is further enhanced for off-normal incidence. Predicted currents exceed 31 mA/cm(2). Nc-Si:H solar cells with the same device architecture were conformally grown on periodic substrates and compared with randomly textured substrates. The periodic back reflector solar cells with nanopillars demonstrated higher quantum efficiency and photocurrents that were 1 mA/cm(2) higher than those for the randomly textured back reflectors.

URL<Go to ISI>://WOS:000317587600002
DOI10.1557/jmr.2013.41