Patent ID: 7972687
Filing Date: 2011-07-05
Classification: C25D,H01L,Y10T

Abstract:
1. A vertical-alignment type porous silicon material, comprising: a plurality of pores aligned vertically within the silicon material, wherein the pores include a first pore, a second pore, and a third pore that extend from an upper surface of the silicon material to a lower surface of the silicon material, wherein a diameter of the first pore and a diameter of the third pore are substantially the same and a diameter of the second pore is larger or smaller than the diameter of the first pore, wherein the first pore is provided in a first region of the silicon material that has a first impurity concentration, wherein the second pore is provided in a second region of the silicon material that has a second impurity concentration, wherein the third pore is provided in a third region of the silicon material that has a third impurity concentration, and wherein the first impurity concentration and the second impurity concentration are different, and the third impurity concentration and the second impurity concentration are different.