Patent ID: 11862464
Assignee: UNISANTIS ELECTRONICS SINGAPORE PTE. LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 0:
1. A method for manufacturing a three-dimensional semiconductor device, the method comprising steps of:
forming a first substrate, a second substrate comprising a semiconductor layer on the first substrate, and a first material layer on the second substrate;
forming first and second band-like material layers on the first material layer, wherein first band-like material layer is formed on a top of the second band-like material;
forming a second material layer to cover the first and second band-like material layers in their entirety and forming a third material layer on the second material layer;
smoothing the second material layer and the third material layer so that top surfaces of the second and third material layers come in alignment with a top surface of the first band-like material layer;
removing top portions of the second material layer as deeply as a height of the first band-like material layer;
forming a third band-like material layer on a top of the second material layer between a side surface of the third material layer and a side surface of the first band-like material layer;
removing the smoothed third material layer;
using the first band-like material layer and the third band-like material layer and etching the smoothed second material layer as a mask to form a fourth band-like material layer in contact with side surfaces of the second band-like material layer;
forming a fourth material layer to cover the fourth band-like material layer in its entirety and forming a fifth material layer on the fourth material layer;
smoothing the fourth material layer and the fifth material layer so that a top surfaces of the fourth material layer and the fifth material layer come in alignment with the top surface of the first band-like material layer;
removing top portions of the fourth material layer as deeply as the height of the first band-like material layer;
forming a fifth band-like material layer on a top of the fourth material layer between a side surface of the fifth material layer and a side surface of the third band-like material layer;
removing the smoothed fifth material layer;
using the first band-like material layer, the third band-like material layer, and the fifth band-like material layer as a mask to etch the smoothed fourth material layer to form a sixth band-like material layer in contact with a side surface of the fourth band-like material layer;
removing the third band-like material layer and the fourth band-like material layer;
forming a seventh band-like material layer formed in a single layer or in multiple layers above or below the first band-like material layer, wherein the seventh band-like material layer is formed orthogonal to the first band-like material layer;
forming a rectangular or circular first mask material layer based at least on the first material layer, or the second band-like material layer, or the sixth band-like material layer, wherein the first mask material layer is formed in a first overlapping area of the seventh band-like material layer, the second band-like material layer, and the sixth band-like material layer; and
using the first mask material layer as a mask to etch the second substrate to form a three-dimensionally-shaped semiconductor layer on the first substrate and
forming the three-dimensionally-shaped semiconductor layer as a channel.