Half Euler Spiral Nanoantenna based Smart City Compatible Thin Film Solar Cell

A theoretical investigation on modification of a simple strip nanoantenna to overcome the polarization mismatch problem is presented. The modified design half Euler spiral nanoantenna (HESNA) is proposed along with its possible application aspects for thin solar cell (TFSC) performance enhancement. The performed study reveals that Half Euler spiral nanoantenna equally responds to the both the orthogonally polarized component of the impinging light with significant local field enhancement as a result of localized surface plasmons (LSP). The generation of LSP is explained with the help of tangential magnetic field component. The nanoantenna design also exhibits relatively larger energy confinement compared to its parent nanostrip design. The presented study on the HESNA describes that the polarization mismatch loss can be reduced by introducing spiral bend on one of the sides of the nanostrip. The study has been performed on CST Studio suite. Half Euler spiral nanoantenna incorporated thin film solar cell exhibits 66% absorption enhancement with 65% increased photocurrent.