Abstract:
The invention relates to a method for improving the surface roughness of a semiconductor substrate. A method is provided for reducing the roughness of a semiconductor substrate surface comprising the steps of: providing a semiconductor substrate, the surface of which comprises a group IV mono-crystalline semiconductor material, and depositing, on said group IV mono-crystalline semiconductor material, a layer of (substantially) the same group IV mono-crystalline semiconductor material, by a deposition technique using nitrogen and/or at least one noble gas as carrier gas.
Abstract:
A method is provided for depositing a monocrystalline Sn-containing semiconductor material on a substrate, comprising providing a semiconductor material precursor, a Sn precursor and a carrier gas in a chemical vapor deposition (CVD) reactor, and epitaxially growing the Sn- containing semiconductor material on the substrate, wherein the Sn precursor comprises tin tetrachloride (SnC14). SnC14 is used as Sn-precursor for chemical vapor deposition of Sn comprising semiconductor materials.
Abstract:
Method and apparatus of to obtain as-deposited polycrystalline and low-stress SiGe layers. These layers are used in Micro Electro-Mechanical Systems (MEMS) devices or micromachined structures. Different parameters are analysed which effect the stress in a polycrystalline layer. The parameters include, without limitation: deposition temperature; concentration of semiconductors (e.g., the concentration of Silicon and Germanium in a SixGe1-x layer, with x being the concentration parameter); concentration of dopants (e.g., the concentration of Boron or Phosphorous); amount of pressure; and use of plasma. Depending on the particular environment in which the polycrystalline SiGe is grown, different values of parameters are used.
Abstract:
A method for introducing species into a strained semiconductor layer comprising: providing a substrate comprising a first region comprising an exposed strained semiconductor layer, loading the substrate in a reaction chamber, then forming a conformal first species containing-layer by vapor phase deposition (VPD) at least on the exposed strained semiconductor layer, and thereafter performing a thermal treatment, thereby diffusing at least part of the first species from the first species-containing layer into the strained semiconductor layer and activating at least part of the diffused first species in the strained semiconductor layer.
Abstract:
The present invention provides a method for fabricating a dielectric stack in an integrated circuit comprising the steps of (i) forming a high-k dielectric layer on a semiconductor substrate, (ii) subjecting said semiconductor substrate with said high-k dielectric layer to a nitrogen comprising vapor phase reactant and silicon comprising vapor phase reactant in a plasma-enhanced chemical vapor deposition process (PECVD) or a plasma-enhanced atomic layer chemical vapor deposition (PE ALCVD) process. Furthermore, the present invention provides a dielectric stack in an integrated circuit comprising (i) a high-k dielectric layer comprising at least a high-k material, (ii) a dielectric layer comprising at least silicon and nitrogen; (iii) an intermediate layer disposed between said high-k dielectric layer and said dielectric layer, said intermediate layer comprising said high-k material, silicon and nitrogen.
Abstract:
A method is provided for depositing a monocrystalline Sn-containing semiconductor material on a substrate, comprising providing a semiconductor material precursor, a Sn precursor and a carrier gas in a chemical vapor deposition (CVD) reactor, and epitaxially growing the Sn- containing semiconductor material on the substrate, wherein the Sn precursor comprises tin tetrachloride (SnC14). SnC1 4 is used as Sn-precursor for chemical vapor deposition of Sn comprising semiconductor materials.
Abstract:
A method for introducing species into a strained semiconductor layer comprising: providing a substrate comprising a first region comprising an exposed strained semiconductor layer, loading the substrate in a reaction chamber, then forming a conformal first species containing-layer by vapor phase deposition (VPD) at least on the exposed strained semiconductor layer, and thereafter performing a thermal treatment, thereby diffusing at least part of the first species from the first species-containing layer into the strained semiconductor layer and activating at least part of the diffused first species in the strained semiconductor layer.
Abstract:
The invention relates to a semiconductor device comprising a semiconductor substrate and having on its top at least a Thin Strain Relaxed Buffer, consisting essentially of a stack of three layers, characterized in that the Thin Strain Relaxed Buffer is not an active part of the semiconductor device and in that said three layers defining the Thin Strain Relaxed Buffer have an essentially constant Ge concentration, said three layers being: - a first epitaxial layer of Si 1-x Ge x , x being the Ge concentration; - a second epitaxial layer of Si 1-x Ge x : C on said first epitaxial layer, the amount of C being at least 0.3 %; - a third epitaxial layer of Si 1-x Ge x on said second layer.