NOVELTY - Producing (M1) uniform nanowire array involves: either growing an array of two-element nanowires and uniformly doping or alloying each two-element nanowire, with respect to each other two-element nanowire, with at least one doping or alloying element, through a wet chemical synthesis with a precursor solution; or uniformly doping or alloying each two-element nanowire of a two-element nanowire array with at least a third element through a wet chemical synthesis with the precursor solution, to form array of at least three-element nanowires.    USE - For production of a uniform nanowire array used in solar cell device or electronic device (selected from optoelectronic device) (all claimed); in light emitting diodes.    ADVANTAGE - The produced uniform nanowire array is used in light emitting diodes with improved efficiencies over existing technologies. The method produces uniform nanowire array in a low cost, large yield, environmental friendliness, and low reaction temperature, enabling the production of improved optoelectronic and display devices.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for following:    (1) a system for providing a uniform nanowire array comprising: first module configured to grow an array of two-element nanowires; second module configured to prepare a precursor solution including at least one doping or alloying element and a base; and third module configured to provide a uniform nanowire array by using a wet chemical synthesis with the precursor solution, to provide an at least three-element nanowire array including a uniform composition distribution;    (2) a uniform nanowire array (A1) comprising several nanowires including at least three elements, where each nanowire being uniform with respect to a concentration of the at least three-elements in a radial cross section;    (3) a uniform nanowire array (A1) produced (M2) by: growing a uniform array of two-element nanowires; mixing a solution of chemical precursors including at least one doping element and a base; disposing the array of two-element nanowires in the solution; and heating the disposed array of two-element nanowires in a manner uniformly doping or alloying the array of two-element nanowires with the doping or alloying element, to form a uniform array of at least three-element nanowires;    (4) a solar cell device comprising at least one layer including a uniform three-element nanowire array having uniform three-element nanowires with respect to each other nanowire in terms of chemical composition; and    (5) an electronic device comprising several nanowires defining a junction of the device, where each nanowire includes a uniform concentration of at least three elements.