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Surface plasmon enhanced light-trapping in polycrystalline silicon thin-film solar

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4 Author(s)
Varlamov, S. ; Univ. of NSW, Sydney, NSW, Australia ; Ouyang, Z. ; Zhao, X. ; Jung, D.S.

These The paper reports a development and implementation of light trapping based on light scattering from plasmonic metal nanoparticles. The nanoparticles were formed on the surface of planar polycrystalline Si thin-film solar cells by annealing of a precursor Ag film. The light absorption by the cells and resulting photocurrent enhancement is maximised by optimising the design of the nanoparticle light-trapping scheme, which includes the nanoparticle size and location, the local dielectric environment, and an application of a supplementary back-surface reflector. A large photocurrent enhancement is achieved due to high scattering and coupling efficiencies of the incident light from Ag nanoparticles into the thin-film cells. For the optimum design comprising a “Si-film/nanoparticles/magnesium fluoride/diffuse white paint” structure short-circuit current enhancement of 44% is demonstrated for the cell fabricated by e-beam evaporation on 3 mm thick planar glass superstrate. The enhancement is further increased up to 50% when the developed light-trapping scheme is applied to the cell fabricated by PECVD on 1 mm thick planar glass superstrate.

Published in:

Photonics Global Conference (PGC), 2010

Date of Conference:

14-16 Dec. 2010

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