Abstract:
A semiconductor memory cell, a semiconductor memory device, and a method for manufacturing the same are disclosed. The semiconductor memory cell may comprise: a substrate; a channel region on the substrate; a gate region above the channel region; a source region and a drain region on the substrate and at opposite sides of the channel region; and a buried layer, which is disposed between the substrate and the channel region and comprises a material having a forbidden band narrower than that of a material for the channel region material. The buried layer material has a forbidden band narrower than that of the channel region material, so that a hole barrier is formed in the buried layer. Due to the barrier, it is difficult for holes stored in the buried layer to leak out, resulting in an improved information holding duration of the memory cell utilizing the floating-body effect.
Abstract:
The present disclosure relates to a method of forming an epitaxial layer through asymmetric cyclic deposition etch (CDE) epitaxy. An initial layer growth rate of one or more cycles of the CDE process are designed to enhance a crystalline quality of the epitaxial layer. A growth rate of the epitaxial material may be altered by adjusting a flow rate of one or more silicon-containing precursors within a processing chamber wherein the epitaxial growth takes place. An etch rate may also be altered by adjusting a temperature or partial pressure of one or more vapor etchants, or the temperature within the processing chamber. In some embodiments, an initial layer thickness that is greater than a critical thickness of the epitaxial material for strain relaxation is achieved with a low growth rate, followed by a high growth rate for the remainder of epitaxial growth. Other methods are also disclosed.
Abstract:
A method of forming a semiconductor device is disclosed. At least one gate structure is provided on a substrate, wherein the gate structure includes a first spacer formed on a sidewall of a gate. A first disposable spacer material layer is deposited on the substrate covering the gate structure. The first disposable spacer material layer is etched to form a first disposable spacer on the first spacer. A second disposable spacer material layer is deposited on the substrate covering the gate structure. The second disposable spacer material layer is etched to form a second disposable spacer on the first disposable spacer. A portion of the substrate is removed, by using the first and second disposable spacers as a mask, so as to form two recesses in the substrate beside the gate structure. A stress-inducing layer is formed in the recesses.
Abstract:
A method for growing planar, semi-polar nitride film on a miscut spinel substrate, in which a large area of the planar, semi-polar nitride film is parallel to the substrate's surface. The planar films and substrates are: (1) {1011} gallium nitride (GaN) grown on a {100} spinel substrate miscut in specific directions, (2) {1013} gallium nitride (GaN) grown on a {110} spinel substrate, (3) {1122} gallium nitride (GaN) grown on a {1100} sapphire substrate, and (4) {1013} gallium nitride (GaN) grown on a {1100} sapphire substrate.
Abstract:
A semiconductor substrate is provided having an insulator thereon with a semiconductor layer on the insulator. A deep trench isolation is formed, introducing strain to the semiconductor layer. A gate dielectric and a gate are formed on the semiconductor layer. A spacer is formed around the gate, and the semiconductor layer and the insulator are removed outside the spacer. Recessed source/drain are formed outside the spacer.
Abstract:
A method of fabrication of a metal oxide semiconductor field effect transistor includes first providing a substrate on which a gate structure is formed. Afterwards, a portion of the substrate is removed to form a first recess in the substrate at both ends of the gate structure. Additionally, a source/drain extension layer is deposited in the first recess and a number of spacers are formed at both ends of the gate structure. Subsequently, a portion of the source/drain extension and the substrate are removed to form a second recess in the source/drain extension and a portion of the substrate outside of the spacer. In addition, a source/drain layer is deposited in the second recess. Because the source/drain extension and the source/drain layer have specific materials and structures, short channel effect is improved and the efficiency of the metal oxide semiconductor field effect transistor is improved.
Abstract:
Manufacturing an III-V engineered substrate involves providing a base substrate comprising an upper layer made of a first III-V compound with a or a crystal orientation, forming an intermediate layer comprising at least a buffer layer of a second III-V compound, wherein the intermediate layer is overlying and in contact with the upper layer of the base substrate. Then a pseudomorphic passivation layer made of a group IV semiconductor material is grown so as to be overlying and in contact with the intermediate layer. This can enable an unpinned interface. The substrate surface can be smoother, implying fewer problems from surface stress. It can be used in electronic devices such as metal-oxide-semiconductor field effect transistors (MOSFETs), high electron mobility transistors (HEMTs), tunneling field effect transistors (TFETs), and optoelectronic devices.
Abstract:
A strain balanced active-region design is disclosed for optoelectronic devices such as light-emitting diodes (LEDs) and laser diodes (LDs) for better device performance. Lying below the active-region, a lattice-constant tailored strain-balancing layer provides lattice template for the active-region, enabling balanced strain within the active-region for the purposes of 1) growing thick, multiple-layer active-region with reduced defects, or 2) engineering polarization fields within the active-region for enhanced performance. The strain-balancing layer in general enlarges active-region design and growth windows. In some embodiments of the present invention, the strain-balancing layer is made of quaternary InxAlyGa1-x-yN (0≦x≦1, 0≦y≦1, x+y≦1), whose lattice-constant is tailored to exert opposite strains in adjoining layers within the active-region. A relaxation-enhancement layer can be provided beneath the strain-balancing layer for enhancing the relaxation of the strain-balancing layer.
Abstract translation:公开了用于诸如发光二极管(LED)和激光二极管(LD)的光电子器件的应变平衡有源区设计,以获得更好的器件性能。 在活性区域之下,晶格常数量身定制的应变平衡层为活性区域提供晶格模板,使活性区域内的平衡应变达到目的1)生长厚的多层活性区域,减少 缺陷,或2)在活动区域内设计极化场,以提高性能。 应变平衡层通常扩大了主动区域设计和增长窗口。 在本发明的一些实施例中,应变平衡层由其晶格常数被定制以施加的四元In x Al y Ga 1-x-y N(0< n 1; x&n 1; 1,x 1和y 1; 在活性区域内相邻层的相反应变。 可以在应变平衡层的下方设置松弛增强层,以增强应变平衡层的松弛。
Abstract:
Enhancement mode transistors are described where a Group III-N compound is used in the source and drain regions to place tensile strain on the channel. The source and drain regions may be raised or embedded, and fabricated in conjunction with recessed or raised compression regions for p channel transistors.
Abstract:
If the size of a single crystal silicon layer attached is not appropriate, even when a large glass substrate is used, the number of panels to be obtained cannot be maximized. Therefore, in the present invention, a substantially quadrangular single crystal semiconductor substrate is formed from a substantially circular single crystal semiconductor wafer, and a damaged layer is formed by irradiation with an ion beam into the single crystal semiconductor substrate. A plurality of the single crystal semiconductor substrates are arranged so as to be separated from each other over one surface of a supporting substrate. By thermal treatment, a crack is generated in the damaged layer and the single crystal semiconductor substrate is separated while a single semiconductor layer is left over the supporting substrate. After that, one or a plurality of display panels is manufactured from the single crystal semiconductor layer bonded to the supporting substrate.