Effect of thermal annealing on the photoluminescence properties of bilayer arrays of SiO2 and TiO2 nanospheres and its application as down conversion layers in c-Si solar cells

Experimental results on the influence of the annealing temperature on the photoluminescence (PL) emission of silica and Titania arrays are presented. Bilayers of titania and silica nanoparticles (NPs) of 100 nm and 600 nm, respectively, were deposited on crystalline silicon (c-Si) substrates and exposed to an annealing process from 400°C to 1100°C in a controlled atmosphere. Our results show that PL intensity emissions can be switched controlling the annealing temperature for 30 minutes. Annealing parameters from bilayer NPs results are applied as absorber layers in c-Si solar cells to enhance their performance characteristic.