Polymer Solar Cells Manipulated with Selectively Transparent Electrodes for Plasmonic Upconversion-Assisted Photovoltaics

Recently, upconversion systems located underneath solar cells have been arising to additionally absorb the solar photons with energy below the bandgap of photoactive material. However, polymer-based thin film solar cells incorporated with upconversion are still challenging, because a pre-existing reflective electrode frustrates the photonic interaction between photon absorption and upconversion process. Herein, we present selectively transparent multilayer electrode that allows penetration of only photons related to the upconversion process for achieving the benefits from plasmonic enhanced upconversion backplane.