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

Claim 3:
4. The method for manufacturing the three-dimensional semiconductor device according to claim 1, further comprising forming an eight band-like material layer above or below the first band-like material, and forming a ninth band-like material layer on a top of the eighth band-like material layer and the eighth and ninth band-like material layers having identical in shape the seventh band-like material layer in planar view, wherein forming the seventh band-like material layer steps of:
forming a sixth material layer and a seventh material layer on the sixth material layer so that the sixth and seventh material layers cover the eighth and ninth band-like material layers;
smoothing the sixth material layer and the seventh material layer so that a top surface of the sixth material layer and a top surface of the seventh material layer come in alignment with a top surface of the eighth band-like material layer;
using the eighth band-like material layer and the seventh material layer as a mask to etch a top of the sixth material layer to form a third recess;
filling the third recess to form a tenth band-like material layer so that a top surface of the tenth band-like material layer comes in alignment with the top surface of the eighth band-like material layer;
removing the smoothed seventh material layer;
using the eighth band-like material layer and the tenth band-like material layer as a mask to etch the sixth material layer to form an eleventh band-like material layer being in contact with a side surface of the ninth band-like material layer; and
removing either the eighth band-like material layer and the ninth band-like material layer, or removing the tenth band-like material layer and the eleventh band-like material layer to form a lower layer or both upper and lower layers of a remaining band-like material layer as the seventh band-like material layer.