PHOTOVOLTAIC DEVICE WITH AN ANTI-REFLECTIVE COATING AND ANTI-REFLECTIVE COATING FOR PHOTOVOLTAIC DEVICES

Photovoltaic device comprising an anti-reflective coating on a light incident side of a transparent cover layer, the anti-reflective coating comprising a layer of diatom frustules, each of the frustules comprising two adjacent and connected porous silica layers, the first porous silica layer having a pore diameter and pore pitch defining a first layer porosity, the second porous silicon layer having a pore diameter and pore pitch defining a second layer porosity, the second layer porosity being less than the first layer porosity, the layer of diatom frustules being arranged such that the first porous silica layer is light incident with respect to the second porous silica layer.