Plasmonic layers based on Au-nanoparticle-doped TiO2 for optoelectronics: structural and optical properties.

摘要: The anti-reflective effect of dielectric coatings used in silicon solar cells has traditionally been the subject intensive studies and practical applications. In recent years interest permanently grown plasmonic layers based on metal nanoparticles, which are shown to increase light trapping underlying silicon. present work we have combined these two concepts by means situ synthesis Au nanoparticles a matrix (TiO2), is commonly as an coating cells, added third element: 10-20% porosity matrix. formed controllable wet etching low concentration HF. As consequence, experimentally measured reflectance coated such layer decreases practically zero broad wavelength region around localized surface plasmon resonance. Furthermore, demonstrate that extinction spectra films can be successfully accounted for Fresnel formulae, double refractive index metal-dielectric material used. This cannot explained effective medium theory (Maxwell-Garnett, example) appears when contribution located at TiO2/Si interface high enough result formation modes.