NOVELTY - The structure has several diodes which convert the sunlight to electricity, having a surface portion exposed to the sun. The outer surface of diode formed of a material with first index of refraction. A main lens layer (54) overlies the surface portion, having transparent particles with an average diameter less than 300 nm. Second index of refraction of particles is less than first index of refraction. Auxiliary lens layer (58) overlies the main lens layer, having transparent particles with a larger diameter and third index of refraction less than the second index of refraction.    USE - Solar cell structure e.g. photovoltaic (PV) panel.    ADVANTAGE - The sequence of layers of high-index of refraction nanoparticles e.g., doped glass beads or other high-index particles such as titanium dioxide in transparent binder can be deposited over the silicon spheres, so that the omni directional, graded index antireflection coating can be formed. The nanoparticle can have average diameter of less than 100 nm. The sizes of the nanoparticles are smaller than the wavelengths of visible light to limit scattering by the nanoparticles. Single lens coating layer can simplify the number of coating steps during the roll-to-roll process. The multiple layers with different bulk refractive indexes are coated and cured on top of each other to more precisely grade the refractive index of the lens. Conformal lenses are more optimally shaped and are inherently optimally positioned over the diodes, so efficiency is improved. The index of refraction of the lenses is also stepped or graded to reduce the reflectivity of the silicon microspheres.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for forming the solar cell structure.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view illustrating the deposition of lower-index and larger particles of the graded-index lens.    Dielectric layer (36)    Metal bus bar (48)    Quantum dot layer (50)    Lens layers (54,58)    Glass bead (60)