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The technology uses a silicon-in-silica fiber and a moving thermal gradient to induce capillary breakup in sub-micron fibers, resulting in the formation of monodisperse spheres. The processes allows for a continuous array of sphere of diameters less than 500 nanometers to be fabricated internal to the fiber. One application is to use this technology on P and N type silicon cores. The process creates spheres which can be fused into bi-spherical silicon “PN molecules” which have been experimentally verified to have formed PN junctions.