Abstract:
In one illustrative embodiment, the method comprises forming a sacrificial layer of material (34) above a substrate (30) comprised of silicon, performing a wet etching process to remove the sacrificial layer (34), implanting fluorine atoms into selected portions of the substrate (30) after the sacrificial layer (34) is removed, and performing a thermal oxidation process to form a plurality of gate insulation layers (42, 44) above the substrate (30), the gate insulation layers (42) formed above the fluorine implanted selected portions of the substrate (30) having a thickness that is greater than a thickness of the gate insulation layers (44) formed above portions of the substrate (30) not implanted with fluorine.
Abstract:
A transistor, comprising a semiconducting substrate (30), a gate insulation layer (48) positioned above the substrate (30), agate electrode (46) positioned above the gate insulation layer (48), a plurality of source/drain regions formed in the substrate (30), a first (40A) and a second (52) sidewall spacer positioned adjacent the gate electrode (46), and a metal silicide layer (54) formed above each of the source/drain regions, a portion of the metal silicide layer (54) being positioned adjacent the first sidewall spacer (40A) and under the second sidewall spacer (52). The method comprises forming a transistor by forming a gate insulation layer (48) and a gate electrode (46) above a semiconducting substrate (30), forming a first sidewall spacer (40A) adjacent the gate electrode (46), forming a metal silicide layer (50) adjacent the first sidewall spacer (40A) and above previously formed implant regions in the substrate, forming a second sidewall spacer (52) above a portion of the metal silicide layer (50) and adjacent the first sidewall spacer (40A), and forming additional metal silicide material (50A) above the metal silicide layer (50) extending beyond the second sidewall spacer (52).
Abstract:
STI divot formation is eliminated or substantially reduced by employing a very thin nitride polish stop layer (52), e.g., no thicker than 400Å. The very thin nitride polish stop layer (52) is retained in place during subsequent masking, implanting and cleaning steps to form dopant regions (80), and is removed prior to gate oxide (101) and gate electrode (100) formation.
Abstract:
A multiple-channel semiconductor device has fully or partially depleted quantum wells and is especially useful in ultra large scale integration devices, such as CMOSFETs. Multiple channel regions (15) are provided on a substrate (12) with a gate electrode (16) formed on the uppermost channel region (15), separated by a gate oxide (14c), for example. The vertical stacking of multiple channels (15) and the gate electrode (16) permit increased drive current in a semiconductor device without increasing the silicon area occupied by the device.
Abstract:
A semiconductor device comprising a substrate 18 having a first crystal orientation is provided. A first insulating layer 14 overlies the substrate 18 and a plurality of silicon layers overlie the first insulating layer 14. A first silicon layer 42 comprises silicon having a second crystal orientation and a crystal plane. A second silicon layer 25 comprises silicon having the second crystal orientation and a crystal plane that is substantially orthogonal to the crystal plane of the first silicon layer 42. Because holes have higher mobility in the (110) plane, semiconductor device performance can be enhanced by the selection of silicon layers with certain crystal plane orientations. In addition, a method of forming a semiconductor device is provided. A silicon-on-insulator structure comprising a first silicon substrate 18 having a first crystal orientation with a first insulating layer 14 formed thereon and a first silicon layer 19 having a second crystal orientation and a crystal plane overlying the first insulating layer 14 is bonded to a second silicon substrate 20. The second silicon substrate 20 has the second crystal orientation and a crystal plane and a second insulating layer 24 formed thereon. The second silicon substrate 20 comprises a line of defects 22 created by implanting hydrogen ion into the second silicon substrate 20. The crystal plane of the second silicon substrate 20 is oriented substantially orthogonal to the crystal plane of the first silicon layer 19. The second silicon substrate 20 is split and removed alonf the line of defects 22 leaving behind the second insulating layer 24 and a second silicon layer 25 on the silicon-on-insulator structure. A plurality of devices with different crystal orientations can be subsequently formed on a single, planar silicon-on-insulator structure by selectively etching the silicon-on-insulator structure down to silicon layers of different crystal orientations, growing selective epitaxial silicon layers in the etched regions, and subsequently planarizing the silicon-on-insulator structure by chemical-mechanical polishing.
Abstract:
A resistive structure (102) formed overlying a semiconductor substrate is masked with a silicide block layer (120) to define a portion of the resistive structure that is to be unsilicided and a portion of the resistive structure to be silicided. The silicide block layer (120) is changed to facilitate different processes.
Abstract:
A method of forming a semiconductor device provides a gate electrode (32) on a substrate (30); and an oxide liner (34) that is less than 100 A in thickness on the substrate (30) and the gate electrode (32). A nitride layer (38) is formed on the oxide liner (34). The nitride layer (38) is etched to form nitride spacers (40), the etching stopping on the oxide liner (34). The thinner oxide liner (34), e.g., less than 100 A, prevents the liner (34) from acting as a sink for dopants during thermal processing so that the dopants in the source/drain extension regions (36) and the source/drain regions (42) remain in the substrate (30) during the thermal processing, thereby preventing degradation of transistor performance.
Abstract:
In one illustrative embodiment, the method comprises forming a sacrificial layer of material (34) above a substrate (30) comprised of silicon, performing a wet etching process to remove the sacrificial layer (34), implanting fluorine atoms into selected portions of the substrate (30) after the sacrificial layer (34) is removed, and performing a thermal oxidation process to form a plurality of gate insulation layers (42, 44) above the substrate (30), the gate insulation layers (42) formed above the fluorine implanted selected portions of the substrate (30) having a thickness that is greater than a thickness of the gate insulation layers (44) formed above portions of the substrate (30) not implanted with fluorine.
Abstract:
A multiple-channel semiconductor device has fully or partially depleted quantum wells and is especially useful in ultra large scale integration devices, such as CMOSFETs. Multiple channel regions (15) are provided on a substrate (12) with a gate electrode (16) formed on the uppermost channel region (15), separated by a gate oxide (14c), for example. The vertical stacking of multiple channels (15) and the gate electrode (16) permit increased drive current in a semiconductor device without increasing the silicon area occupied by the device.