Abstract:
This disclosure relates to methods of producing thin layers of silicon as well as thin layers of silicon on insulating substrates such as silicon dioxide or polycrystalline silicon by forming either an n- layer of single crystal silicon over a p++ layer of single crystal silicon or a p- layer of single crystal silicon over an n++ layer of single crystal silicon and then removing either the n++ or p++ single crystal substrate, as the case may be, by utilizing an etch which will only etch the n++ or p++ region and will stop when the n- or p- region, as the case may be, has been reached.
Abstract:
The invention relates to a method of scribing and separating dice from each other after fabrication in a semiconductor wafer in a manner such that active circuit regions in the dice reside as near to an edge of a die as possible. The wafer is anistropically etched through the active layer and into the substrate through an opening in the mask to form a generally V-shaped channel with the dice then being separated along a vertex of the channel. The dice are then positioned to abut each other in the form of a mosaic.
Abstract:
The disclosure relates to a three dimensional semiconductor structure formed in a semiconductor substrate wherein electrical components, both active and passive, are formed on the substrate surface as well as in grooves formed in the substrate at an angle and extending to the surface. The substrate surface is designed to lie in a predetermined crystallographic plane of the substrate material and the grooves extend in a predetermined crystallographic direction from said plane, this being accomplished by orientation dependent etching.
Abstract:
Disclosed are improved field-effect and bipolar semiconductor devices and the method of making them, wherein maximum junction control provides highly predictable device parameters. Low temperature epitaxial depositions provide tight junction thickness and resistivity control, and an orientation dependent etch forms grooves circumscribing portions of the host substrate and overlying epitaxial layers to provide dielectrically isolated single crystalline mesas utilized in forming electronic devices.This is a division of application Ser. No. 275,116, filed July 26, 1972.
Abstract:
A method for preparing a germanium layer (22) adjacent to a germanium silicon layer (20). Initially, a P-germanium silicon layer (16) is deposited on to an N-germanium silicon layer (14). The continuous germanium layer (22) is formed by heating the layers (14 and 16) in a steam oxidation step to approximately 1000 degrees Centigrade to transform the P-germanium silicon layer (16) into the P-germanium layer (18) and a SiO.sub.2 layer (22). A method for forming a heterojunction bipolar transistor utilizing a P-germanium layer (50) is also disclosed.
Abstract:
A baseboard for orthogonal mounting of integrated circuit chips is described. Plural channels (14) are anisotropically etched in a silicon baseboard (10). A corresponding plurality of integrated circuit chips (12) are inserted into the channels (14). A number of baseboard contact pads (18) are formed adjacent each channel (14), and are solder bonded to corresponding chip conductor pads (16). Interconnect conductors (20, 28) provide connection of each baseboard pad (18) either to other chips (12) or to connector pads (22) located adjacent an edge (26) of the baseboard chip mount (10). A coating (30) of silicon carbide over the surface of the baseboard chip mount (10) improves the thermal efficiency of the assembly.
Abstract:
Process permitting control of the thickness of the thin layer of semiconductor material by first forming a slot of a predetermined depth in one surface so that the slot will be exposed during removal of material from the opposite surface should the thickness of the thin layer of semiconductor material become less than the depth of the slot, and a (110) oriented semiconductor substrate having a slot formed therein which is bounded by converging {111} planes.In a preferred embodiment the thickness control is realized by first preparing the slice of semiconductor material so that at least one of its surfaces has a (100) orientation. There is then formed on the surface of the slice having the (100) orientation an etch-resistant mask having a window opened therethrough such that the window defines on the surface of the slice two lines which are parallel to each other and to lines defined by the intersection of {111} planes with the surface of the slice. Semiconductor material is then removed through the windows by etching to produce a slot having a depth greater than thickness to which the single crystal semiconductor material is to be subsequently processed. A vapor deposited support layer may then be produced on the surface of the slice to which the mask was attached during which process it will fill the slot etched in the semiconductor material through the window. Upon removal of the semiconductor material from the opposite surface of the slice, which may be affected by lapping and polishing, the support layer formed in the slot will become exposed, thus indicating that the thickness of the semiconductor material remaining is equal to or less than the depth of the slot etched in the first surface of the semiconductor material. At the time the first depth control slot is formed in the first surface of the semiconductor slice, there may also be performed a plurality of similar slots, the depth of which are controlled by controlling the width of the window in the etch resistant mask. Thus, as semiconductor material is removed from the slice, the thickness of the material remaining after the removal process can be determined by the number of slots exposed during lapping and polishing.
Abstract:
A baseboard for orthogonal mounting of integrated circuit chips thereto is described. Plural channels (14) are anisotropically etched in a silicon baseboard (10). A corresponding plurality of integrated circuit chips (12) are inserted into the channels (14). A number of baseboard contact pads (18) are formed adjacent each channel (14), and are solder bonded to corresponding chip conductor pads (16). Interconnect conductors (20, 28) provide connection of each baseboard pad (18) either to other chips (12) or to connector pads (22) located adjacent an edge (26) of the baseboard chip mount (10). A coating (30) of silicon carbide over the surface of the baseboard chip mount (10) improves the thermal efficiency of the assembly.
Abstract:
A silicon on insulator semiconductor structure employs a strain layer fabricated of an electrically inactive material. The strain layer comprises silicon with a germanium additive to produce a sublayer exhibiting a low breakdown voltage and thus effective for selective anodization.
Abstract:
A silicon on insulator semiconductor structure employs a strain layer fabricated of an electrically inactive material. The strain layer comprises silicon with a germanium additive to produce a sublayer exhibiting a low breakdown voltage and thus effective for selective anodization.