Abstract:
An apparatus including a substrate; a transistor device on the substrate including a channel and a source and a drain disposed between the channel; a source contact coupled to the source and a drain contact coupled to the drain; and the source and drain each including a composition including a concentration of germanium at an interface with the channel that is greater than a concentration of germanium at a junction with the source contact. A method including defining an area on a substrate for a transistor device; forming a source and a drain each including an interface with the channel; and forming a contact to one of the source and the drain, wherein a composition of each of the source and the drain includes a concentration of germanium at an interface with the channel that is greater than a concentration at a junction with the contact.
Abstract:
A germanium-containing semiconductor device and a method for forming a germanium-containing semiconductor device are described. The method includes providing a germanium-containing substrate, depositing an aluminum-containing diffusion barrier layer on the germanium-containing substrate, depositing a high-k layer on the aluminum-containing diffusion barrier layer, and exposing the high-k layer to atomic oxygen to reduce the equivalent oxide thickness (EOT) of the high-k layer while avoiding oxidizing the germanium-containing substrate. The germanium-containing semiconductor device includes a germanium-containing substrate, an aluminum-containing diffusion barrier layer on the germanium-containing substrate, and a high-k layer on the aluminum-containing diffusion barrier layer, where the high-k layer has been exposed to atomic oxygen to reduce the EOT of the high-k layer while avoiding oxidizing the germanium-containing substrate.
Abstract:
A semiconductor device including a germanium containing substrate including a gate structure on a channel region of the semiconductor substrate. The gate structure may include a silicon oxide layer that is in direct contact with an upper surface of the germanium containing substrate, at least one high-k gate dielectric layer in direct contact with the silicon oxide layer, and at least one gate conductor in direct contact with the high-k gate dielectric layer. The interface between the silicon oxide layer and the upper surface of the germanium containing substrate is substantially free of germanium oxide. A source region and a drain region may be present on opposing sides of the channel region.
Abstract:
Methods and apparatus are provided for depositing a layer of pure germanium (12) can on a silicon substrate (11). This germanium layer is very thin, on the order of about 14 A, and is less than the critical thickness for pure germanium on silicon. The germanium layer (12) serves as an intermediate layer between the silicon substrate (11) and the high k gate layer (13), which is deposited on the germanium layer (12). The germanium layer (12) helps to avoid the development of an oxide interfacial layer during the application of the high k material. Application of the germanium intermediate layer in a semiconductor structure results in a high k gate functionality without: the drawbacks of series capacitance due to oxide impurities. The germanium layer (12) further improves mobility.
Abstract:
Methods are provided for treating germanium surfaces (200) in preparation for subsequent deposition, particularly gate dielectric deposition by atomic layer deposition (ALD). Prior to depositing, the germanium surface (200) is treated with plasma products or thermally reacted with vapor reactants. Examples of surface treatments leave oxygen bridges, nitrogen bridges, -OH, -NH and/or -NH 2 terminations that more readily adsorb ALD reactants. The surface treatments avoid deep penetration of the reactants into the germanium bulk but improve nucleation.