Dual use of one-dimensional, long-pitch metallic gratings for polarization-diverse light absorption enhancement in organic photovoltaic structures

We report design and experimental realization of an organic PV device structure to trap incident light in all polarization states utilizing 1D, long-pitch (> 1000 n m) gratings. Polarization diversity was achieved by balancing the plasmonic and guided mode-based light trapping routes between different polarization states. The experiment showed strong enhancements in absorption in all polarization states and translate into a 15~25% increase in the power conversion efficiency.