Patent ID: 8536028

Claim:
A self alignment and assembly fabrication method for stacking multiple material layers, comprising the steps of: (1) fabricating a substrate; (2) forming a first isolation layer having a first through hole on the substrate; (3) forming a first material on the substrate and the first isolation layer, wherein the partial first material fills into the first through hole and contacts with the substrate, and then defining the pattern and structure of the first material on the first isolation layer by way of photolithography and etching; (4) forming a second isolation layer having a second through hole on the substrate; (5) forming a second material on the second isolation layer, wherein the partial second material fills into the second through hole and contacts with the substrate, and then defining the pattern and structure of the second material on the second isolation layer by way of photolithography and etching; (6) forming a third isolation layer having a third through hole on the substrate; (7) forming a third material on the third isolation layer, wherein the partial third material fills into the third through hole and contacts with the substrate, and then defining the pattern and structure of the third material on the third isolation layer by way of photolithography and etching; (8) forming a fourth isolation layer for covering the third isolation layer, the third material and the third through hole; (9) making the first material, the second material and the third material grow epitaxially from the surface of the substrate by using a rapid thermal anneal process; (10) removing the first isolation layer, the second isolation layer, the third isolation layer, and the fourth isolation layer through a wet etching process, such that the first material is bonded to the substrate by self alignment, the second material is bonded to the first material by self alignment, and the third material is bonded to the second material by self alignment; (11) forming a hard mask layer on the substrate, the first material, the second material, and the third material; and (12) selectively etching the first material, the second material, and the third material via the hard mask, so as to define the primary portions of the first material, the second material, and the third material, and remove redundancy portion.