摘要:
A layer of a semiconductor material is epitaxially grown on a single-crystal semiconductor structure and on a polycrystalline semiconductor structure. The epitaxial layer is then etched in order to preserve a non-zero thickness of said material on the single-crystal structure and a zero thickness on the polycrystalline structure. The process of growth and etch is repeated, with the same material or with a different material in each repetition, until a stack of epitaxial layers on said single-crystal structure has reached a desired thickness. The single crystal structure is preferably a source/drain region of a transistor, and the polycrystalline structure is preferably a gate of that transistor.
摘要:
A method for depositing a silicon oxide layer on a substrate including a silicon region and a silicon-germanium region, including the steps of: forming a very thin silicon layer having a thickness ranging from 0.1 to 1 nm above silicon-germanium; and depositing a silicon oxide layer on the substrate.
摘要:
A method for depositing a silicon oxide layer on a substrate including a silicon region and a silicon-germanium region, including the steps of: forming a very thin silicon layer having a thickness ranging from 0.1 to 1 nm above silicon-germanium; and depositing a silicon oxide layer on the substrate.
摘要:
A single-crystal layer of a first semiconductor material including single-crystal nanostructures of a second semiconductor material, the nanostructures being distributed in a regular crystallographic network with a centered tetragonal prism.
摘要:
A method for forming on a Ge or Si monocrystalline substrate successive Si/Ge, Si/SiGe, or Si/SiGe/Ge layers for a Ge substrate and inversely for a Si substrate is described. Electrochemical treatment of the stack of layers to make the layers porous and form therein residual crystallites is also described. The invention may be used to provide devices having layers of planes of quantum drops.
摘要:
The process consists in depositing, by chemical vapour deposition using a mixture of silicon and germanium precursor gases, a single-crystal layer of silicon or germanium on a germanium or silicon substrate by decreasing or increasing the temperature in the range 800-450° C. and at the same time by increasing the Si/Ge or Ge/Si weight ratio from 0 to 100% in the precursor gas mixture, respectively.
摘要:
A method of nitriding the gate oxide layer of a semiconductor device includes the chemical growth on a silicon substrate of a native silicon oxide layer ≦1 nm thick; treating said substrate coated with the native silicon oxide layer with gas NO at a temperature ≦700° C. and a pressure level ≦104 Pa to obtain a nitrided native silicon oxide layer; and the growth of the gate oxide layer. The method is applicable to PMOS devices. Further modifications and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art in view of this description. Accordingly, this description is to be construed as illustrative only and is for the purpose of teaching those skilled in the art the general manner of carrying out the invention. It is to be understood that the forms of the invention shown and described herein are to be taken as the presently preferred embodiments. Elements and materials may be substituted for those illustrated and described herein, parts and processes may be reversed, and certain features of the invention may be utilized independently, all as would be apparent to one skilled in the art after having the benefit of this description of the invention. Changes may be made in the elements described herein without departing from the spirit and scope of the invention as described in the following claims.
摘要:
The process relates to the production of a layer of a single-crystal first material on a second material. The second material has at least one aperture exposing a surface portion of a single-crystal third material. The process generally includes forming an at least partially crystalline first layer of said first material on said surface portion of the third material. Then, an amorphous or partially crystalline second layer of the first material is formed on the at least partially crystalline first layer of the first material and on one part of the second material that is around said aperture. Finally, the process includes recrystallization annealing of the first material. Thus, it is possible to produce, within one and the same wafer, either transistors on a germanium-on-insulator substrate with transistors on a silicon-on-insulator substrate, or transistors on a germanium-on-insulator substrate with transistors on a silicon substrate.
摘要:
A method for manufacturing an insulated semiconductor layer, including: forming a porous silicon layer on a single-crystal silicon surface; depositing an insulating material so that it penetrates into the pores of the porous silicon layer; eliminating the insulating material to expose the upper surface of the porous silicon; and growing by epitaxy a semiconductor layer.
摘要:
The invention relates to a single-crystal layer of a first semiconductor material including single-crystal nanostructures of a second semiconductor material, the nanostructures being distributed in a regular crystallographic network with a centered tetragonal prism