Patent ID: 8178440

Claim:
A method for forming a recess array device structure in a semiconductor substrate, comprising: providing a base material comprising a semiconductor substrate and a first material, the semiconductor substrate having a plurality of first recesses, the first material being disposed in the first recesses, and the first material being different from the semiconductor substrate; forming a plurality of second recesses on the semiconductor substrate, wherein the second recesses intersect the first recesses; forming a second material in the second recesses, wherein the second material protrudes from the base material; forming a metal layer on the protruded second material and the base material, wherein the metal layer includes a first portion and a second portion, the first portion covers the protruded second material, and the second portion covers the base material; removing the second portion of the metal layer to form a plurality of metal layer openings so as to expose the base material; and etching the base material according to the metal layer openings so as to form a plurality of third recesses, wherein the third recesses intersect the first recesses and are parallel to the second recesses.