Demonstration of the portability of porous microstructure architecture to indium-doped ZnO electron selective layer for enhanced light scattering in inverted organic photovoltaics

Abstract

We propose and demonstrate the incorporation of porous microstructures on indium-doped zinc oxide (IZO) electron selective layer in inverted organic photovoltaics (OPV). Porosity was induced in the IZO layer with the addition of polyethylene glycol (PEG) organic template at the optimal IZO/PEG ratio of 4:1. When compared to the OPV device with non-porous IZO, the device employing porous IZO showed a 16 % improvement in current density and a 13 % improvement in efficiency. This is primarily due to the increased light scattering as substantiated by the haze factor studies. This PEG assisted method of introducing microporous structure is therefore shown to be compatible with the doped interlayer and is thus a portable method of enhancing light scattering in OPV devices.