Patent ID: 8309391

Claim:
A method for manufacturing an array-type nanotube layer for a thin-film solar cell, comprising the steps of: (a) preparing an isotropic Si-substrate; (b) sputtering a metal Ti layer onto the isotropic Si-substrate so as to form a unique Ti-coated Si-substrate; (c) heat-treating the Ti-coated Si-substrate in a vacuum heat-treatment environment so as to remove possible residual stresses between the metal Ti layer and the isotropic Si-substrate; (d) annealing the Ti-coated Si-substrate in an annealing heat-treatment environment so as to transform the metal Ti layer into an intermediate-phase metal Ti layer; (e) anodizing the intermediate-phase metal Ti layer so as to transform the intermediate-phase metal Ti layer into an array-type nanotube layer for the solar cell, wherein the array-type nanotube layer includes a plurality of TiO2 nanotubes arranged in a dense array-type manner; and (f) applying a reverse voltage to separate the array-type nanotube layer from the isotropic Si-substrate.