Texas Instruments Corporation

Eric F Schulte

Adam J Lewis, Jr

William R McKee

Vernon R Porter

Russell H Murdock

A method for fabricating a metal insulator semiconductor includes first forming a substrate (10) having an array of switching elements formed therein. A plurality of deformable Indium pads (16) and (18) are then formed on the surface of the substrate and in contact with each of the switching elements. A superstrate is formed from a layer of mercury cadmium telluride (32) and a layer of dielectric insulating material (34). The superstrate is pressed down adjacent the substrate (10) with the upper surface of the conductive gates (16) and (18) contracting the lower surface of the dielectric layer (34). The deformable pads (16) and (18) conform to the lower surface of the dielectric layer (34). Epoxy (36) is then disposed in the interstices of the device to provide an adhesive force between the substrate (10) and the superstrate. The thickness of the mercury cadmium telluride layer (32) is then decreased to reduce the path length for photon generated carriers created at the upper surface to diffuse to the diametrically opposite side.

Configuration of a metal insulator semiconductor with a processor based

A method for fabricating a metal insulator semiconductor includes first forming a substrate (10) having an array of switching elements formed therein. A plurality of deformable Indium pads (16) and (18) are then formed on the surface of the substrate and in contact with each of the switching elements. A superstrate is formed from a layer of mercury cadmium telluride (32) and a layer of dielectric insulating material (34). The superstrate is pressed down adjacent the substrate (10) with the upper surface of the conductive gates (16) and (18) contacting the lower surface of the dielectric layer (34). The deformable pads (16) and (18) conform to the lower surface of the dielectric layer (34). Epoxy (36) is then disposed in the interstices of the device to provide an adhesive force between the substrate (10) and the superstrate. The thickness of the mercury cadmium telluride layer (32) is then decreased to reduce the path length for photon generated carriers created at the upper surface to diffuse to the diametrically opposite side.

A via formation process for HgCdTe (i.e., for pseudo-binary alloys of HgTe and CdTe). Photoresist is patterned on the HgCdTe surface, and ion milling is used to cut holes in the HgCdTe as defined by the photoresist. With this photoresist still in place, the HgCdTe is wet etched to smooth the via walls and expand the via size to a precise dimension.

Method for via formation in HgCdTe

Laser patterning of metallization is done by transmitting laser energy through a liquid film directly in contact with the metallization to be patterned. When the metal is evaporated by the laser energy, the vapor is condensed immediately by the liquid film. This prevents redeposition of metal on the patterned surface and suspends the removed metal in the liquid so that it may be reclaimed by filtration.

Device fabrication incorporating liquid assisted laser patterning of

A method for patterning layers of material on a substrate without photoresist by using a selective sublimation process. Differences in thermal conductivity of materials underneath a layer of material to be patterned cause patterning by sublimation over areas of low thermal conductivity, initiated by a pulsed or swept radiated energy source.

Sublimation patterning process

A photoluminescent dye is suspended in a transparent medium. When exposed to light, the dye re-emits light in a narrow frequency range. Photovoltaic cells responsive to the re-emitted light are arranged around the sides of the collector medium, and are electrically connected to a low power demand device, such as a calculator. A reflective surface is placed next to the collector medium and kept a slight distance away such that an air gap is formed between the collector and the reflective surface. This gap increases the efficiency of the collector to the point that the collector will operate a small calculator even though exposed to low light levels such as are normal in an office environment.

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Richardson, TX, United States of America

Eric F Schulte