Abstract
In solar conversion devices, photon absorption is the key factor to get useful output power. The energy band-gap of photo-anode material in dye-sensitized solar cells (DSSCs) must match with the dye so that electron transfer between dyes to semiconductor material is easy. The photo-anode based on titanium oxide, graphene oxide, and their bilayer composite were modeled by the finite element method. The absorption capacity of the bilayer photoanode was studied in the range between 300 to 750 nm before and after introducing the silver nanoparticle. The shell thickness and size of core–shell Ag@oxides and silver nanoparticles were 5 and 70 nm, respectively. The results showed that the narrow bandgap energy of photoanode based on composite GO/TiO2resulted in 29.4 and 39.1% absorption enhancement efficiency as compared to pure TiO2 and GO, respectively. However, the strongly localized electric field intensity of Ag embedded oxide nanoparticle further leads to broad band optical absorption. The photoanode based on Ag@GO/Ag@TiO2 composite has 37 and 48% absorption enhancement as compared to Ag@TiO2 and Ag@GO NPs respectively. This novel approach improves the light-harvesting ability thereby achieving high photo-conversion efficiency.
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