Abstract:
The aim of the invention is to provide a method and device for producing differently doped doping regions (DG) in a substrate (S) using a single mask (DM). For this purpose, different mask regions are provided that comprise respective elongate mask openings (MO) that are differently aligned in relation to the direction in space of an oblique implantation. Between the first and the second oblique implantation the substrate is rotated, thereby opposing maximum and minimum shading in the different mask regions in the first oblique implantation and reversing the relations in the second oblique implantation once the substrate is rotated.
Abstract:
The invention relates to a memory cell (1), comprising a trench (3), in which a trench capacitor is arranged. Furthermore a vertical transistor is formed in the trench (3), above the trench capacitor. A barrier layer (60) is provided for the electrical connection of the conducting trench filling (10) to a lower doped region (18) of the vertical transistor. The barrier layer (60) is a diffusion barrier for doped material or impurities contained in the conducting trench filling.
Abstract:
As a first step a novel low cost integration method for a plurality of deep isolation trenches on the same chip is provided. The trenches have an additional n-type or p-type doped region surrounding the trench - silicon interface. Providing such variations of doping the trench interface is achieved by using implantation masking layers or doped glass films structured by a simple resist mask. By simple layout variation of the top dimension of the trench various trench depths at the same time can be ensured. Using this method, wider trenches will be deeper and smaller trenches will be shallower.
Abstract:
The invention relates to a method for producing a memory, comprising the following steps: formation of a trench (108) in a substrate (101), formation of an isolation collar (168) in the trench (108), formation of a dielectric layer (164) in the trench (108), filling of the trench (108) with a conductive trench-fill agent (161) and formation of a transistor (110). In order to form a trench isolation (180) once the trench (108) has been filled with the conductive trench-fill agent (161), a trench cover dielectric (430) is also formed in the trench (108) and said trench cover dielectric (430) is used as an etching mask during the formation of the trench isolation (180), in such a way that said trench isolation (180) is formed in a self-aligning manner, in relation to the trench (108). As a result of this self-aligned production of the trench isolation (180), the position of the same (180) is to a great extent independent of the alignment accuracy of the photo-exposure means.
Abstract:
The through-contact of the substrate is formed by a contact hole filling (4) of a semiconductor layer (11) and a metallization (17) of a cutout (16) in a rear-side semiconductor layer (13), wherein the semiconductor layers are separated from one another by a buried insulation layer (12), at the layer position of which the contact hole filling and the metallization respectively end.
Abstract:
According to the invention, a trench capacitor is formed inside a trench (30) that is arranged inside a substrate (20). The trench (30) is filled with a conductive trench filling (50) that serves as an inner capacitor electrode. An epitaxial layer (75) is grown on the lateral wall of the trench (30) on the substrate (20). A buried contact (60) is arranged between the conductive trench filling (50) with the second intermediate layer (65) and the epitaxially grown layer (75). A dopant out-diffusion (80), which is formed while leading out from the buried contact (60), is arranged inside the epitaxially grown layer (75). The epitaxially grown layer (75) enables the dopant out-diffusion (80) to be further removed from a selection transistor (10) located next to the trench whereby permitting the prevention of short channel effects in the selection transistor (10).
Abstract:
The invention relates to a method for producing a trench capacitor. According to said method, after the trench has been formed, an insulating layer (35) is first deposited, from which the insulation collar (75) is subsequently to be formed. The trench (10) is then partially filled with a sacrificial fill material (40) and a thin structural layer (55) is deposited thereon. Spacers are formed from said layer which cover the insulating layer (35) in the upper region (45) of the trench (10). The sacrificial fill material (40) and the insulating layer (35) are then removed completely in the lower region (50) of the trench (10). The insulation collar (75) is thus formed in the upper region (45) of the trench (10).
Abstract:
The invention comprises a memory with a storage cell (100) that is formed in a substrate (105) and consists of a trench capacitor (110) and a transistor (160). The trench capacitor (110) is connected to the transistor (160) with a self-aligned connection (220). The transistor (160) at least partially covers said trench capacitor (110). The trench capacitor (110) is filled with a conductive trench filling and an insulating cover layer (135) is located on said conductive trench filling (130). An epitaxy layer (245) is located above said insulating cover layer (135). The transistor (160) is formed in said epitaxy layer (245). The self-aligned connection (220) is formed in a contact trench (205) and consists of an insulation collar (235) into which a conductive material (225) is introduced. A conductive cap (230) is formed on said conductive material.
Abstract:
The invention relates to a semiconductor element with at least one layer of tungsten oxide (WOx), optionally in a structured tungsten oxide (WOx) layer. The inventive semiconductor element is characterized in that the relative permittivity ( epsilon r) of the tungsten oxide layer (WOx) is higher than 50.