Plasmonic solar cell

A plasmonic-enhanced solar cell, commonly referred to simply as plasmonic solar cell, is a type of <a href="/facts/Solar_cell/3L814UCC">solar cell</a> (including thin-film or wafer-based cells) that converts light into electricity with the assistance of <a href="/facts/Plasmon/kuCMxx5f">plasmons</a>, but where the photovoltaic effect occurs in another material.

A direct plasmonic solar cell is a solar cell that converts light into electricity using plasmons as the active, photovoltaic material.
The active material thickness varies from that of traditional silicon PV (~100-200 μm wafers)
, to less than 2 μm thick, and theoretically could be as thin as 100 nm. The devices can be supported on <a href="/facts/Substrate_(materials_science)/LwwkV6rX">substrates</a> cheaper than <a href="/facts/Silicon/cgWx0hdr">silicon</a>, such as <a href="/facts/Glass/hezRsAGf">glass</a>, <a href="/facts/Steel/aN6qWo4H">steel</a>, <a href="/facts/Plastic/Kla5QItn">plastic</a> or other polymeric materials (e.g. paper). 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 <a href="/facts/Absorption_coefficient/ppCIsSGw">absorption coefficient</a>. Methods for light trapping are important for thin film solar cells. Plasmonic-enhanced cells improve absorption by scattering light using metal <a href="/facts/Nanoparticle/k8kNxX4E">nano-particles</a> excited at their localized <a href="/facts/Surface_plasmon_resonance/8JKldMUT">surface plasmon resonance</a>. Plasmonic core-shell nanoparticles located in the front of the thin film solar cells can aid weak absorption of Si solar cells in the near-infrared region—the fraction of light scattered into the substrate and the maximum optical path length enhancement can be as high as 3133. On the other hand, direct plasmonic solar cells exploit the fact that incoming light at the plasmon resonance frequency induces electron oscillations at the surface of the nanoparticles. The oscillation electrons can then be captured by a conductive layer producing an electrical current. The voltage produced is dependent on the bandgap of the conductive layer and the potential of the electrolyte in contact with the nanoparticles. 
There is still considerable research necessary to enable these technologies to reach their full potential and enable the commercialization of plasmonic solar cells.

Plasmonic solar cell open-in-new

Plasmonic solar cell