Abstract
Forward-scattering efficiency (FSE) is first proposed when an Ag nanoparticle
serves as the light-trapping structure for thin-film (TF) solar cells because the Ag
nanoparticle's light-trapping efficiency lies on the light-scattering direction of
metal nanoparticles. Based on FSE analysis of Ag nanoparticles with radii of 53 and
88 nm, the forward-scattering spectra and light-trapping efficiencies are
calculated. The contributions of dipole and quadrupole modes to light-trapping
effect are also analyzed quantitatively. When the surface coverage of Ag
nanoparticles is 5%, light-trapping efficiencies are 15.5% and 32.3%, respectively,
for 53- and 88-nm Ag nanoparticles. Results indicate that the plasmon quadrupole
mode resonance of Ag nanoparticles could further enhance the light-trapping effect
for TF solar cells.
© 2011 Chinese Optics Letters
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