NOVELTY - A composite nanorod-based structure comprises first layer with top surface and bottom surface comprising array of nanowires and dielectric material, the nanowires in the array including core semiconducting region with first type of doping and core region length, shell semiconducting region with second type of doping and shell region length, and junction region between the core and shell semiconducting regions with a junction region length.    USE - Composite nanorod-based structure used in photovoltaic devices for generating electricity.    ADVANTAGE - The structure is inexpensive, stable, and non-toxic. It makes possible for photovoltaic devices to have higher energy conversion efficiencies as compared to composites that use nanorods with amorphous or polycrystalline silicon regions.    DETAILED DESCRIPTION - Composite nanorod-based structure comprises first layer with top surface and bottom surface comprising array of nanowires and dielectric material, the nanowires in the array including core semiconducting region with first type of doping and core region length, shell semiconducting region with second type of doping and shell region length, and junction region between the core and shell semiconducting regions with a junction region length. The first type of doping is different from the second type of doping. The shell region length is less than the core region length. The shell semiconducting region surrounds a portion of the core semiconducting region over a length of the core semiconducting region corresponding to the junction region length. The structure includes second layer contacting the top surface of the first layer comprising a conducting material; and third layer contacting the bottom surface of the first layer comprising a conducting material. An INDEPENDENT CLAIM is included for forming composite nanorod-based structure.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic cross-sectional view of a method for making nanorod-based composite.