Abstract
The technological aspects of the formation of thin α-C:H carbon films, the peculiarities of the ion-plasma Q-DLTS spectra of heterostructures α-C:H-Si and α-C: H-GaAs are considered, and activation energy, cross-trapping and density of deep traps, responsible for charge state, are determined. The correlation between the technological regimes of the α-C:H film formation and trap density is established. The technological methods and regimes that allow obtaining structures with a relatively small surface state density N ss ≤10 12 cm -2 are determined. This allows using these structures as a subgate dielectric in GaAs-CMOS structures of LSICs. Low-temperature epitaxy of GaAs-layers on silicon substrates with the use of excimer lasers is developed, where germanium film acts as a buffer layer between Si and GaAs. The technology of carbon films formation by deposition from the carbon target is developed. The use of carbon films as a subgate dielectric allows the formation of CMOS-transistors on GaAs-epilayers with symmetric threshold voltages, which opens a new direction for the development of the sub-micron technology of LSICs and enables to increase the LSICs speed and reduce their production cost.
Highlights
The progress in the development of integrated circuits/ large scale integrated circuits (ICs/LSICs) technologies on GaAs was characterized by significantly less success than provided previously [1,2,3]
The aim of the work is to develop a technology for the formation of complementary metal-oxide-semiconductor (CMOS) transistor structures for LSICs on GaAs epilayers grown on silicon substrates of large diameter (>150 mm)
The operations of subgate dielectric forming by magnetron deposition of carbon films, low-temperature epitaxy on excimer lasers of GaAs-epilayers, and multicharge implantation of retrograde drain-source regions create the basis for the production of CMOS high-speed LSICs on GaAs-epilayers formed on Si-substrates of large diameter
Summary
The progress in the development of integrated circuits/ large scale integrated circuits (ICs/LSICs) technologies on GaAs was characterized by significantly less success than provided previously [1,2,3]. This is due to the problems of obtaining reproducible, less-defective initial materials and structures on Schottky field and complementary metal-oxide-semiconductor (CMOS) transistors of submicron sizes with a small dispersion of the output parameters over the substrate plane. The use of carbon films as a subgate dielectric enables to form CMOS transistors on GaAs epitaxial layers (thereafter, epilayers) with symmetric threshold voltages, which is very actual and opens a new direction for the development of the sub-micron technology of LSIСs
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More From: Eastern-European Journal of Enterprise Technologies
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