Abstract:
III-V lasers integrated with silicon photonic circuits and methods for making the same include a three-layer semiconductor stack formed from III-V semiconductors on a substrate, where a middle layer has a lower bandgap than a top layer and a bottom layer; a mirror region monolithically formed at a first end of the stack, configured to reflect emitted light in the direction of the stack; and a waveguide region monolithically formed at a second end of the stack, configured to transmit emitted light.
Abstract:
A method for forming a device with a multi-tiered contact structure includes forming first contacts in via holes down to a first level, forming a dielectric capping layer over exposed portions of the first contacts and forming a dielectric layer over the capping layer. Via holes are opened in the dielectric layer down to the capping layer. Holes are opened in the capping layer through the via holes to expose the first contacts. Contact connectors and second contacts are formed in the via holes such that the first and second contacts are connected through the capping layer by the contact connectors to form multi-tiered contacts.
Abstract:
A semiconductor structure includes a III-V monocrystalline layer and a germanium surface layer. An interlayer is formed directly between the III-V monocrystalline layer and the germanium surface layer from a material selected to provide stronger nucleation bonding between the interlayer and the germanium surface layer than nucleation bonding that would be achievable directly between the III-V monocrystalline layer and the germanium surface layer such that a continuous, relatively defect-free germanium surface layer is provided.
Abstract:
III-V lasers integrated with silicon photonic circuits and methods for making the same include a three-layer semiconductor stack formed from III-V semiconductors on a substrate, where a middle layer has a lower bandgap than a top layer and a bottom layer; a mirror region monolithically formed at a first end of the stack, configured to reflect emitted light in the direction of the stack; and a waveguide region monolithically formed at a second end of the stack, configured to transmit emitted light.
Abstract:
Various methods to integrate a Group III nitride material on a silicon material are provided. In one embodiment, the method includes providing a structure including a (100) silicon layer, a (111) silicon layer located on an uppermost surface of the (100) silicon layer, a Group III nitride material layer located on an uppermost surface of the (111) silicon layer, and a blanket layer of dielectric material located on an uppermost surface of the Group III nitride material layer. Next, an opening is formed through the blanket layer of dielectric material, the Group III nitride material layer, the (111) Si layer and within a portion of the (100) silicon layer. A dielectric spacer is then formed within the opening. An epitaxial semiconductor material is then formed on an exposed surface of the (100) silicon layer within the opening and thereafter planarization is performed.
Abstract:
III-V lasers integrated with silicon photonic circuits and methods for making the same include a three-layer semiconductor stack formed from III-V semiconductors on a substrate, where a middle layer has a lower bandgap than a top layer and a bottom layer; a mirror region monolithically formed at a first end of the stack, configured to reflect emitted light in the direction of the stack; and a waveguide region monolithically formed at a second end of the stack, configured to transmit emitted light.
Abstract:
A semiconductor structure including a (100) silicon substrate having a plurality openings located within the silicon substrate, wherein each opening exposes a surface of the silicon substrate having a (111) crystal plane. This structure further includes an epitaxial semiconductor material located on an uppermost surface of the (100) silicon substrate, and a gallium nitride material located adjacent to the surface of the silicon substrate having the (111) crystal plane and adjacent a portion of the epitaxial semiconductor material. The structure also includes at least one semiconductor device located upon and within the gallium nitride material and at least one other semiconductor device located upon and within the epitaxial semiconductor material.
Abstract:
A method for fabricating a photovoltaic device includes applying a diblock copolymer layer on a substrate and removing a first polymer material from the diblock copolymer layer to form a plurality of distributed pores. A pattern forming layer is deposited on a remaining surface of the diblock copolymer layer and in the pores in contact with the substrate. The diblock copolymer layer is lifted off and portions of the pattern forming layer are left in contact with the substrate. The substrate is etched using the pattern forming layer to protect portions of the substrate to form pillars in the substrate such that the pillars provide a radiation absorbing structure in the photovoltaic device.