摘要:
Doped diffraction gratings for use in quantum cascade lasers and mid-infrared wavelength vertical cavity surface emitting lasers can be made by introducing periodic variations in the doping levels that result in periodic refractive index variations. Doping is typically accomplished by use of an n type dopant.
摘要:
A light-emitting diode with high luminous efficiency is disclosed which is free from deformation or defect of crystal caused by a dopant. The light-emitting diode emits no light of unnecessary wavelengths and has a wide selection of emission wavelengths. The light-emitting diode comprises a light-emitting layer composed of an ambipolar semiconductor containing no dopant, and an electron implanting electrode, namely an n electrode and a hole implanting electrode, namely a p electrode joined to the light-emitting layer.
摘要:
A light-emitting diode with high luminous efficiency is provided which is free from deformation or defects of a crystal caused by a dopant. The light-emitting diode emits no light of unnecessary wavelengths and has a wide selection of emission wavelengths. The light-emitting diode comprises a light-emitting layer made of an ambipolar semiconductor containing no dopant, and an electron implanting electrode, that is, an n-electrode and a hole implanting electrode, that is, a p-electrode joined to the light-emitting layer.
摘要:
A novel carbon material is obtained by bending at least one carbon atom layer of graphite in at least one selected region along either, or both, of lines I and II in Fig. 1. The bending can be accomplished by scanningly picking the carbon atom layer(s) with a probe of an atomic force microscope or another scanning microscope. The obtained carbon material has at least one round bend having a width of 0.1-10 nm and at least one flap region having a triangular, rectangular or still differently polygonal shape in plan view. When the carbon atom layer(s) is bent with very small radii of curvature, a finely striped ridge-and-groove structure appears in the round bend. The physical properties of the obtained carbon material are uniquely determined by the direction(s) of bending, width of each bend, shape and size of each flap region and the stripe pitch of the ridge-and-groove structure.
摘要:
Embodiments relate to use of a particle accelerator beam to form thin films of material from a bulk substrate are described. In particular embodiments, a bulk substrate having a top surface is exposed to a beam of accelerated particles. In certain embodiments, this bulk substrate may comprise GaN; in other embodiments this bulk substrate may comprise (111) single crystal silicon. Then, a thin film or wafer of material is separated from the bulk substrate by performing a controlled cleaving process along a cleave region formed by particles implanted from the beam. In certain embodiments this separated material is incorporated directly into an optoelectronic device, for example a GaN film cleaved from GaN bulk material. In some embodiments, this separated material may be employed as a template for further growth of semiconductor materials (e.g. GaN) that are useful for optoelectronic devices.
摘要:
Embodiments relate to use of a particle accelerator beam to form thin films of material from a bulk substrate are described. In particular embodiments, a bulk substrate having a top surface is exposed to a beam of accelerated particles. In certain embodiments, this bulk substrate may comprise GaN; in other embodiments this bulk substrate may comprise (111) single crystal silicon. Then, a thin film or wafer of material is separated from the bulk substrate by performing a controlled cleaving process along a cleave region formed by particles implanted from the beam. In certain embodiments this separated material is incorporated directly into an optoelectronic device, for example a GaN film cleaved from GaN bulk material. In some embodiments, this separated material may be employed as a template for further growth of semiconductor materials (e.g. GaN) that are useful for optoelectronic devices.
摘要:
The invention relates to a semiconductor component and to a method for limiting a dopant diffusion, in particular a phosphorus diffusion in germanium. According to the invention, an Si spike is used for this purpose.
摘要:
The invention relates to a method for monolithically depositing a monocrystalline IV-IV layer that glows when excited and that is composed of a plurality of elements of the IV main group, in particular a GeSn or Si-GeSn layer, said IV-IV layer having a dislocation density less than 6 cm -2 , on an IV substrate, in particular a silicon or germanium substrate, comprising the following steps: providing a hydride of a first IV element (A), such as Ge 2 H 6 or Si 2 H 6 ; providing a halide of a second IV element (B), such as SnCl 4 ; heating the substrate to a substrate temperature that is less than the decomposition temperature of the pure hydride or of a radical formed therefrom and is sufficiently high that atoms of the first element (A) and of the second element (B) are integrated into the surface in crystalline order, wherein the substrate temperature lies, in particular, in a range between 300°C and 475°C; producing a carrier gas flow of an inert carrier gas, in particular N 2 , Ar, He, which in particular is not H 2 ; transporting the hydride and the halide and decomposition products arising therefrom to the surface at a total pressure of at most 300 mbar; depositing the IV-IV layer, or a layer sequence consisting of IV-IV layers of the same type, having a thickness of at least 200 nm, wherein the deposited layer is, in particular, a Si y Ge 1 -x-y Sn layer, with x > 0.08 and y ≤ 1.