Patent ID: 8541293
Filing Date: 2013-09-24
Classification: H01L

Abstract:
1. A method of controlled lateral etching, comprising: forming a second material layer on a first material layer having a protruding structure, the second material layer comprising laterally extending portions and vertically extending portions; forming spacers on outer surfaces of the second material layer opposite to vertical surfaces of the protruding structure; forming a third material layer on surfaces of the second material layer and the spacers, the third material layer comprising laterally extending portions and vertically extending portions; forming a mask layer, which extends in a direction lateral to a surface of the first material layer, on the third material layer; and laterally etching the vertically extending portions of the third material layer, the spacers, and the vertically extending portions of the second material layer sequentially, to leave a functional layer composed of the laterally extending portions of the second material layer and the laterally extending portions of the third material layer on the first material layer.