Abstract:
A multi-gate high electron mobility transistor, HEMT, and its methods of formation are disclosed. The multi-gate HEMT includes a substrate (102) and an adhesion layer (104) on top of the substrate (102). A channel layer (120) is disposed on top of the adhesion layer (104), and a first gate electrode (106) is disposed on top of the channel layer (120). The first gate electrode (106) has a first gate dielectric layer (116) in between the first gate electrode (106) and the channel layer (120). A second gate electrode (108) is embedded within the substrate (102) and beneath the channel layer (120). The second gate electrode (108) has a second gate dielectric layer (118) completely surrounding the second gate electrode (108). A pair of source and drain contacts (110) are disposed on opposite sides of the first gate electrode (106). (Figure 1B)
Abstract:
A method including forming a barrier layer on a polar compound semiconductor layer on a sacrificial substrate; coupling the sacrificial substrate to a carrier substrate to form a composite structure wherein the barrier layer is disposed between the polar compound semiconductor layer and the carrier substrate; separating the sacrificial substrate from the composite structure to expose the polar compound semiconductor layer; and forming at least one circuit device. An apparatus including a barrier layer on a substrate; a transistor device on the barrier layer; and a polar compound semiconductor layer disposed between the barrier layer and the transistor device, the polar compound semiconductor layer including a two-dimensional electron gas therein.
Abstract:
Techniques are disclosed for heteroepitaxial growth of a layer of lattice-mismatched semiconductor material on an initial substrate, and transfer of a defect-free portion of that layer to a handle wafer or other suitable substrate for integration. In accordance with some embodiments, transfer may result in the presence of island-like oxide structures on the handle wafer/substrate, each having a defect-free island of the lattice-mismatched semiconductor material embedded within its upper surface. Each defect-free semiconductor island may have one or more crystalline faceted edges and, with its accompanying oxide structure, may provide a planar surface for integration. In some cases, a layer of a second, different semiconductor material may be heteroepitaxially grown over the handle wafer/substrate to fill areas around the transferred islands. In some other cases, the handle wafer/substrate itself may be homoepitaxially grown to fill areas around the transferred islands.
Abstract:
A multi-gate high electron mobility transistor (HEMT) and its methods of formation are disclosed. The multi-gate HEMT includes a substrate and an adhesion layer on top of the substrate. A channel layer is disposed on top of the adhesion layer, and a first gate electrode is disposed on top of the channel layer. The first gate electrode has a first gate dielectric layer in between the first gate electrode and the channel layer. A second gate electrode is embedded within the substrate and beneath the channel layer. The second gate electrode has a second gate dielectric layer completely surrounding the second gate electrode. A pair of source and drain contacts are disposed on opposite sides of the first gate electrode.