Plasmonic photo-thermoelectric energy converter with black-Si absorber

02 engineering and technology 0210 nano-technology 7. Clean energy
DOI: 10.1016/j.solmat.2015.06.035 Publication Date: 2015-07-07T05:00:54Z
ABSTRACT
Thermal to electrical energy conversation by Seebeck element was enhanced by up to ∼ 50% by dispersing 50 nm diameter Au nanoparticles over the black-Si light harvesting surface at an optimized concentration. Size of Au nanoparticles is the defining factor for the spectral position of the extinction maximum at which the cumulative absorption of black-Si (without nanoparticles) can be augmented resulting in an increase of voltage produced by a Seebeck element. Black-Si with reflectivity of 1-2% over the entire visible spectral range is a promising material for extending the operational range of solar and thermal energy converters into longer wavelength regions. Numerical simulations reveal efficient localization of light energy absorption inside black-Si.
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