Abstract:
An oxide film (24) is formed on a surface of a semiconductor substrate (2). A resist layer (26) is formed on a surface of the oxide film. The resist layer has an opening (26a). A tapered trench (24a) is formed by forming wall surfaces (24b) of the oxide film by etching a part of the oxide film exposed from the opening. The wall surfaces are inclined with respect to a direction perpendicular to the surface of the semiconductor substrate and reach the surface of the semiconductor substrate. A space between the wall surfaces is narrowed towards the surface of the semiconductor substrate. The semiconductor substrate is etched through the tapered trench. A width of the tapered trench formed on the surface of the semiconductor substrate is smaller than a width of the opening formed in the resist layer.
Abstract:
Procédé de gravure d'un motif complexe souhaité (50), dans une première face d'un substrat, comportant les étapes suivantes : - gravure simultanée d'au moins un premier et deuxième sous-motifs à travers la première face du substrat, les sous-motifs gravés étant séparés par au moins une paroi de séparation, la largeur du premier sous-motif étant plus importante que la largeur du second sous-motif au niveau de la première face, et la profondeur du premier sous-motif étant plus importante que la profondeur du second sous-motif selon une direction perpendiculaire à ladite première face, - une étape de retrait ou d'élimination de ladite paroi de séparation, pour révéler le motif complexe souhaité (50).
Abstract:
A trench-gated field effect transistor (FET) is formed as follows. Using one mask, a plurality of active gate trenches and at least one gate runner trench are defined and simultaneously formed in a silicon region such that (i) the at least one gate runner trench has a width greater than a width of each of the plurality of active gate trenches, and (ii) the plurality of active gate trenches are contiguous with the at least one gate runner trench.
Abstract:
Some embodiments include methods of forming patterns utilizing copolymer. A main body of copolymer may be formed across a substrate, and self-assembly of the copolymer may be induced to form a pattern of structures across the substrate. A uniform thickness throughout the main body of the copolymer may be maintained during the inducement of the self-assembly. In some embodiments, the uniform thickness may be maintained through utilization of a wall surrounding the main body of copolymer to impede dispersal of the copolymer from the main body. In some embodiments, the uniform thickness may be maintained through utilization of a volume of copolymer in fluid communication with the main body of copolymer.