Abstract
Despite tremendous efforts on improving the solar cell conversion efficiency at normalincidence, improvement at oblique angles has not been widely addressed, not to mentionthe corresponding light absorption behaviors at different polarizations. Here wereport the characterization of the solar cell conversion efficiency and the spectra ofphotoresponsivity at various tilted angles. The results show that TM (transverse magnetic)polarized light possesses higher photoresponsivity than TE (transverse electric)polarized light and the difference becomes larger with the incidence angle. Toaddress the issue, a monolayer of silica nanoparticles on the solar cell surface wasemployed to improve the light absorption. Even though both TE and TM wavesshow a decrease in the surface reflectivity with the presence of nanoparticles, theinteraction between the silica particles and the TE wave is more significant. Theimprovement of the conversion efficiency for obliquely incident light is explained from therefractive index difference of the nanoparticles for the TE and TM polarizations.
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