Abstract:
An isolation trench formed in a semiconductor substrate has side walls and a bottom wall. Spacers are on the side walls and face each other for forming a narrow channel therebetween. The bottom wall and the spacers are coated with an electrically insulating material for delimiting a closed empty cavity in the channel. The isolation trench is applicable to the manufacture of integrated circuits.
Abstract:
A MOS transistor formed in a silicon substrate comprising an active area surrounded with an insulating wall, a first conductive strip covering a central strip of the active area, one or several second conductive strips placed in the active area right above the first strip, and conductive regions placed in two recesses of the insulating wall and placed against the ends of the first and second strips, the silicon surfaces opposite to the conductive strips and regions being covered with an insulator forming a gate oxide.
Abstract:
The invention relates to a process for protection of the grid of a transistor in an integrated circuit for production of a local interconnection pad straddling over the grid and the silicon substrate on which it is formed. The process consists of applying a double dielectric-conducting layer on the transistor grid into which a polysilicon layer is added in order to use the selectivity principle, which is large considering the etching of polysilicon with respect to the oxide in which the local interconnection pad is formed. Furthermore, with the process according to the invention, a silicidation treatment can be applied beforehand on the active areas of the transistor and the grid.
Abstract:
A semiconductor device is provided that includes a semiconductor channel region extending above a semiconductor substrate in a longitudinal direction between a semiconductor source region and a semiconductor drain region, and a gate region extending in the transverse direction, coating the channel region, and insulated from the channel region. The source, channel, and drain regions are formed in a continuous semiconductor layer that is approximately plane and parallel to the upper surface of the substrate. Additionally, the source, drain, and gate regions are coated in an insulating coating so as to provide electrical insulation between the gate region and the source and drain regions, and between the substrate and the source, drain, gate, and channel regions. Also provided is an integrated circuit that includes such a semiconductor device, and a method for manufacturing such a semiconductor device.
Abstract:
The fabrication of an integrated circuit includes a first phase of producing an electronic chip and a second phase of producing at least one auxiliary component placed above the chip and of producing a protective cover which covers the auxiliary component. The first phase of producing the chip is effected from a first semiconductor substrate and comprises the formation of a cavity lying in a chosen region of the chip and emerging at the upper surface of the chip. The second production phase includes the production of the auxiliary component from a second semiconductor substrate, separate from the first, and then the placement in the cavity of the auxiliary component supported by the second substrate and the mutual adhesion of the second substrate to the upper surface of the chip lying outside the cavity. The second substrate then also forms the protective cover.
Abstract:
The invention relates to a process for treating a portion of the surface of a substrate according to a first and second surface treatments which are different from each other and are intended respectively for a first group of regions and for a second group of regions of the surface portion, the two groups of regions being mutually complementary with respect to the surface portion, the process making it possible to use only a single operation of positioning a mask which differentiates the regions of the first and second groups of regions, using the same protective materials for the regions of each group of regions against the effects of the treatment intended for the regions of the other group of regions. Application to the fabrication of semiconductor products.
Abstract:
The invention relates to a DRAM integration method that does away with the alignment margins inherent to the photoetching step of the upper electrode of the capacitance for inserting the bit line contact. The removal of the upper electrode is self-aligned on the lower electrode of the capacitance. This is accomplished by forming a difference in topography at the point where the opening of the upper electrode is to be made, and depositing a non-doped polysilicon layer on the upper electrode. An implantation of dopants is performed on this layer, and the part of the non-doped layer located in the lower part of the zone showing the difference in topography is selectively etched. The remainder of the polysilicon layer and the part of the upper electrode located in the lower layer are also etched.
Abstract:
A method is provided for fabricating integrated electronic components. According to the method, an initial structure is produced on the surface of a first substrate. This initial structure incorporates a defined pattern formed from volumes of differentiated materials. At least part of the initial substrate that includes the defined pattern is transferred onto a second substrate, preferably by inverting the first substrate against the second substrate and then removing the first substrate. An additional structure is then produced on the second substrate. This additional structure includes volumes of material placed in correspondence with some of the volumes of differentiated material of the defined pattern. The electronic components thus produced may have a suitable configuration in accordance with technological or geometrical constraints. In a preferred method, a selective treatment is applied to the transferred part of the initial structure, so as to make a distinction between the volumes of differentiated material of the pattern.