A Plasmonic solar cell is a type of thin film solar cell that converts light into electricity with the assistance of plasmons. They are typically less than 2 μm thick and theoretically could be as thin as 100 nm. They can use substrates which are cheaper than silicon, such as glass, plastic or steel. One of the challenges for thin film solar cells is that they do not absorb as much light as thicker solar cells made with materials with the same absorption coefficient. Methods for light trapping are important for thin film solar cells. Plasmonic cells improve absorption by scattering light using metal nano-particles excited at their surface plasmon resonance. Incoming light at the plasmon resonance frequency induces electron oscillations at the surface of the nanoparticles. The oscillation e