NOVELTY - The method involves forming a zinc oxide seed layer on a transparent conductive substrate (410), and forming a pattern layer having a set of holes in the zinc oxide seed layer such that the zinc oxide seed layer is partially exposed through the pattern layer. Zinc oxide nanorods are formed vertically aligned from the exposed seed layer. The pattern layer is removed, and an anatase type titanium dioxide solution is coated on the zinc oxide nanorods. The zinc oxide nanorods are sintered to form nanorods having a zinc oxide core/titanium dioxide shell structure.    USE - Method for fabricating a metal oxide nanostructure array substrate that is utilized for an electronic or optical device i.e. dye-sensitized solar cell (claimed).    ADVANTAGE - The method enables vertically aligning nanostructures on the substrate while being separated from each other so as to ensure transparency of the substrate without causing collision of the nanostructures with each other even when the substrate is bent, such that a flexible substrate can be employed and flexibility of devices can be effectively ensured. The method allows reducing a movement route of electrons using the dye-sensitized solar cell including the nanostructure array substrate. The method allows easily collecting electrons in a negative electrode generated as dyes adsorb the light through conduction bands of a titanium diode shell and the zinc oxide core. The method enables facilitating adsorption of dyes in inner and outer peripheral surfaces of nanotubes that are used for the nanostructures, so that the dye adsorption can be increased while increasing open circuit voltage and photoelectric current of the dye-sensitized solar cell, to improve photoelectric conversion efficiency of the photoelectric conversion cell.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a nanostructure array substrate    (2) a dye-sensitized solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a dye-sensitized solar cell in a bending state.    Photo electrode (400)    Transparent conductive substrate (410)    Metal oxide nanostructures (420)    Dye (430)    Counter electrode (500)