Abstract
Wideband perfect light absorbers covering visible and near-infrared solar optical radiations are significant for solar thermal energy systems. In this work, titanium and silicon dioxide multilayer thin film structures were investigated for perfect light absorption in wideband solar optical radiation spectral range from 400 nm to 2500 nm wavelength. Wideband solar light absorbers with different numbers of titanium and silicon dioxide layers and different layer thicknesses were designed, fabricated and characterized. It is found that the optimal wideband solar light absorber consists of only six titanium and silicon dioxide layers that form two cascade optical nanocavities, and increasing the number of optical cavities does not improve optical absorption in the solar spectrum. A super-wideband solar light absorber 97.97% total absorptance over the wavelength range from 400 nm to 1700 nm has been experimentally demonstrated.
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