NOVELTY - Fabricating a solar cell, comprises (a) providing doped substrate (202), (b) depositing monolayer of spheres onto substrate, where the sphere comprises nanospheres and/or microspheres, (c) trimming spheres to introduce space between individual spheres in monolayer, (d) using trimmed spheres as mask to pattern wires (502) in substrate, where the wires comprise nanowires and/or microwires, (e) forming doped emitter layer (702) on patterned wires, (f) depositing top contact electrode over emitter layer, and (g) depositing bottom contact electrode on a side of substrate opposite the wires.    USE - The method is useful for fabricating a solar cell.    ADVANTAGE - The method realize nanowires/microwires in large scale with low cost and high throughput.    DETAILED DESCRIPTION - Fabricating a solar cell, comprises either: (a) providing a doped substrate (202), (b) depositing a monolayer of spheres onto the substrate, where the sphere comprises nanospheres and/or microspheres, (c) trimming the spheres to introduce space between individual spheres in the monolayer, (d) using the trimmed spheres as a mask to pattern wires (502) in the substrate, where the wires comprise nanowires and/or microwires, (e) forming a doped emitter layer (702) on the patterned wires, (f) depositing a top contact electrode over the emitter layer, and (g) depositing a bottom contact electrode on a side of the substrate opposite the wires; or depositing a monolayer of spheres onto a doped substrate, trimming the spheres to introduce space between individual spheres in the monolayer, patterning wires in the substrate using the trimmed spheres as a mask, forming a doped emitter layer on the patterned wires and on the substrate, such that the doped emitter layer is in contact with the patterned wires and the substrate, and the steps (f) and (g) as above per se.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the method of fabricating the nanowire and/or microwire-based solar cell.    Substrate (202)    Pattern wires (502)    Emitter layer (702)