Abstract:
A method of manufacturing a fluid injection device. The method of the present invention applies a compensated geometric shape of the unetched isolating portions to increase the additional compensated portion for etching, or the ion implanting process to reduce the etching rate of the unetched isolating portions. Thus, crosstalk or overshoot in the isolating portions of the fluid injection device can be reduced, and the fluid injection device can be precisely manufactured in a small size.
Abstract:
In a method for producing a diaphragm sensor unit having a semiconductor material substrate, a flat diaphragm and an insulating well for thermal insulation below the diaphragm are generated, for the formation of sensor element structures for at least one sensor. The substrate, made of semiconductor material, in a specified region, which defines sensor element structures, receives a deliberately different doping from the surrounding semiconductor material, that porous semiconductor material is generated from semiconductor material sections between the regions distinguished by doping, and semiconductor material in the well region under semiconductor is rendered porous and under parts of the sensor element structure is removed and/or rendered porous.
Abstract:
The method for fabricating a micro machine comprises the step of burying an oxide film 54 in a first semiconductor substrate 6, the step of bonding the first semiconductor substrate to the second semiconductor substrate with an insulation film 18 therebetween, the step of forming a first mask 66 with an opening in a first region and a second region on both sides of the first region, the step of etching the first semiconductor substrate with a first mask 66 and an oxide film 54 as a mask to thereby form a spring portion 20a integral with the first semiconductor substrate between the oxide film and the insulation film to thereby form a torsion bar including the spring portion, the step of forming a second mask 74 with an opening in the first region and the second region, the step of etching the second semiconductor substrate by using the second mask 74, and the step of etching the insulation film 18 in the first region and the second region. The thickness of the torsion bar can be easily controlled. Thus, a micro machine having a torsion bar can be fabricated with high yields.
Abstract:
In a method for producing a diaphragm sensor unit having a semiconductor material substrate, a flat diaphragm and an insulating well for thermal insulation below the diaphragm are generated, for the formation of sensor element structures for at least one sensor. The substrate, made of semiconductor material, in a specified region, which defines sensor element structures, receives a deliberately different doping from the surrounding semiconductor material, that porous semiconductor material is generated from semiconductor material sections between the regions distinguished by doping, and semiconductor material in the well region under semiconductor is rendered porous and under parts of the sensor element structure is removed and/or rendered porous.
Abstract:
In a method for producing a diaphragm sensor array having a semiconductor material substrate on which a plurality of planar diaphragm regions is arranged as a carrier layer for sensor elements, the planar diaphragm regions are thermally decoupled from one another by crosspieces made of a material having clearly better heat conductive properties compared to the diaphragm regions and the lateral surroundings of the crosspieces. Masking for a subsequent step for producing porous semiconductor material is applied at the locations of the semiconductor material substrate at which the crosspieces for the thermal decoupling are formed, and the semiconductor regions not protected by the masking are rendered porous and the diaphragm regions are produced thereupon. Instead of using porous silicon, a plasma etching process may be performed from the backside of a semiconductor material substrate. In particular, high integration densities of diaphragm sensors may be achieved with both methods. A diaphragm sensor array is produced by one of the methods.
Abstract:
The invention relates to a micromechanical sensor and to a corresponding production method that includes the following steps: a) preparing a doped semiconductor wafer; b) applying an epitaxial layer that is doped in such a way that a jump in the charge carrier density in the interface between the semiconductor wafer and the epitaxial layer occurs; c) optionally etching ventilation holes traversing the epitaxial layer and optionally filling the ventilation holes with a sacrificial material; d) depositing at least one sacrificial layer, at least one spacing layer, a membrane and optionally a semiconductor circuit on the top side of the epitaxial layer using a technology known per se, wherein the semiconductor circuit may be applied after the membrane is formed or while depositing the layers required to form the membrane; e) etching a hole on the back part of the sensor, wherein the etching method is selected in such a way that etching advances in the direction of the top side and ceases in the interference between the wafer and the epitaxial layer by changing charge carrier concentration. The invention also relates to the utilization of the micromechanical sensor in pressure sensors or microphones.
Abstract:
Efficient methods for lithographically fabricating spring structures onto a substrate containing contact pads or metal vias by forming both the spring metal and release material layers using a single mask. Specifically, a pad of release material is self-aligned to the spring metal finger using a photoresist mask or a plated metal pattern, or using lift-off processing techniques. A release mask is then used to release the spring metal finger while retaining a portion of the release material that secures the anchor portion of the spring metal finger to the substrate. When the release material is electrically conductive (e.g., titanium), this release material portion is positioned directly over the contact pad or metal via, and acts as a conduit to the spring metal finger in the completed spring structure. When the release material is non-conductive, a metal strap is formed to connect the spring metal finger to the contact pad or metal via, and also to further anchor the spring metal finger to the substrate.
Abstract:
A dissolved wafer micromachining process is modified by providing an etch control seal around the perimeter of a heavily doped micromechanical structure formed on a substrate. The micromechanical structure is fabricated on a wafer using conventional methods including the formation of a trench that surrounds and defines the shape of the micromechanical structure in the substrate. The etch control seal comprises a portion of the substrate in the form of a raised ring extending around the perimeter of the micromechanical structure and its defining trench. Selected raised areas of the heavily doped micromechanical structure and the top of the raised etch control seal are bonded to a second substrate. A selective etch is then used to dissolve the first substrate so that the heavily doped micromechanical structure remains attached to the second substrate only at the bonded areas. The etch control seal reduces exposure of the micromechanical structure and bonded areas to the etch by preventing the etch from contacting the heavily doped structure until the etch leaks through the dissolving floor of the trench. This occurs only during the final stages of the substrate dissolution step, thus minimizing exposure of the micromechanical structure and bonded areas to the damaging effects of the etch. Use of an etch control seal increases design flexibility and improves micromechanical device yield and quality in a dissolved wafer fabrication process.
Abstract:
The invention relates in particular to a method for producing subsequent patterns in an underlying layer (120), the method comprising at least one step of producing prior patterns in a carbon imprintable layer (110) on top of the underlying layer (120), the production of the prior patterns involving nanoimprinting of the imprintable layer (110) and leave in place a continuous layer formed by the imprintable layer (110) and covering the underlying layer (120), characterized in that it comprises the following step: at least one step of modifying the underlying layer (120) via ion implantation (421) in the underlying layer (120), the implantation (421) being carried out through the imprintable layer (110) comprising the subsequent patterns, the parameters of the implantation (421) being chosen in such a way as to form, in the underlying layer (120), implanted zones (122) and non-implanted zones, the non-Implanted zones defining the subsequent patterns and having a geometry that is dependent on the prior patterns.
Abstract:
The invention relates in particular to a method for producing subsequent patterns in an underlying layer (120), the method comprising at least one step of producing prior patterns in a carbon imprintable layer (110) on top of the underlying layer (120), the production of the prior patterns involving nanoimprinting of the imprintable layer (110) and leave in place a continuous layer formed by the imprintable layer (110) and covering the underlying layer (120), characterized in that it comprises the following step: at least one step of modifying the underlying layer (120) via ion implantation (421) in the underlying layer (120), the implantation (421) being carried out through the imprintable layer (110) comprising the subsequent patterns, the parameters of the implantation (421) being chosen in such a way as to form, in the underlying layer (120), implanted zones (122) and non-implanted zones, the non-Implanted zones defining the subsequent patterns and having a geometry that is dependent on the prior patterns.