Purpose:
in this process, a mixture of NaOH (or KOH) and special additive is
applied for anisotropic etching in order to fabricate pyramid
structural surface. The texturing process aims to create a high quality
surface so as to reduce light reflection. It also removes the
mechanically damaged layer and metal residues.
Light incident to the inclined plane and reflected to another
inclined plane and then light will be repeatedly absorbed.
So we can increase Light incident to the inclined plane the light
absorption.