SeriesInformation ; 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 637-640 ; Abstract ; The influence of plasmon resonances in disc-shaped Ag nanoparticles on the spectral dependence of photocurrents has been studied in Si test solar cells. By use of electron beam lithography, well-defined disc-shaped Ag nanoparticles with a height of 25 nm and with two different height to diameter ratios are produced on SiNx films on top of thin film Si test solar cells. The effect on the external quantum efficiency is investigated by a combination of optical reflection/scattering measurements and wavelength dependent photocurrent and quantum efficiency measurements on the test solar cells. The experimental results are compared to calculations of particle plasmon resonance wavelengths for Ag nanodiscs on SiNx.