Efficient gatherer of sunlight based on two-sided bio-inspired antireflective micro-pyramids with PPy/TiO2

Due to the interfacial reflection on the surface of the optoelectronic material and the device, the conversion efficiency to solar energy is limited. Here, a simple method of fabricating bio-inspired TiO2 micro-pyramids with polypyrrole (PPy) nanoparticles on both sides of glass was introduced. This bio-inspired structure, retarding the change of the refractive index from air to sample surface, was fabricated by soft lithography and self-assembly. The two-sided bio-inspired coating presents excellent antireflective performance and photocatalytic activity.