Abstract:
Methods of doping a semiconductor film are provided. The methods comprise epitaxially growing the III-V semiconductor film in the presence of a dopant, a surfactant capable of acting as an electron reservoir, and hydrogen, under conditions that promote the formation of a III-V semiconductor film doped with the p-type dopant. In some embodiments of the methods, the epitaxial growth of the doped III-V semiconductor film is initiated at a first hydrogen partial pressure which is increased to a second hydrogen partial pressure during the epitaxial growth process.
Abstract:
In a base material with a single-crystal silicon carbide film according to an embodiment of the invention, a plurality of recessed portions is formed on the surface of a silicon substrate, an insulating film including silicon oxide is formed across the surface of the silicon substrate including the inner surfaces of the recessed portions, the top surfaces of side wall portions of recessed portions of the insulating film form flat surfaces, a single-crystal silicon carbide film is joined on the flat surfaces, and the recessed portions below the single-crystal silicon carbide film form holes.
Abstract:
A process for manufacturing a semiconductor wafer which has superior suitability for mass production and reproducibility. The process comprises the steps of preparing a first member which has a monocrystalline semiconductor layer on a semiconductor substrate with a separation layer arranged therebetween with a semiconductor wafer as the raw material, transferring the monocrystalline semiconductor layer onto a second member which comprises a semiconductor wafer after separating the monocrystalline semiconductor layer through the separation layer, and smoothing the surface of the semiconductor substrate after the transferring step so as to be used as a semiconductor wafer for purposes other than forming the first and second members.
Abstract:
An initial single-crystalline diamond base material is prepared from a flat plate having a major surface and side surfaces consisting of low-index planes. Then, single crystalline diamond is homoepitaxially vapor-deposited on the single-crystalline diamond base material, and a resulting diamond material is cut and polished in a particular manner to provide a successive base material on which single-crystalline diamond is again grown, thereby forming a single-crystalline diamond having a large area. A holder for the single-crystalline diamond base material consists of or is coated with a material hardly forming a compound with carbon. Single crystalline diamond can be stably formed on the surfaces of the base material. Consequently, single-crystalline diamond of high quality having a large area can be stably produced in a shorter time using either plasma CVD or a thermal filament method.
Abstract:
In a method of selectively growing a crystal of a compound semiconductor layer which is composed of gallium and arsenic, a selective growth is selectively carried out on a substrate by using a combination of metallic gallium and a reactive gas, such as trisdimethylminoarsine, which includes a metallic compound of arsenic specified by at least one amine. The combination may includes organometallic gallium, such as trimethylgallium, triethylgallium instead of the metallic gallium. Such a combination serves to selectively deposit the compound semiconductor layer only on an exposed portion uncovered with a mask. Any other compound semiconductor layer may be selectively deposited on the exposed portion. The exposed portion may be composed of GaAs, AlGaAs, or InGaAs.
Abstract:
A diamond electronic device constituted of a diamond crystal formed on a substrate comprises a diamond crystal having the ratio (h/L) of length (h) of the diamond crystal in direction substantially perpendicular to the face of the substrate to length (L) of the diamond crystal in direction parallel to the face of the substrate ranging from 1/4 to 1/1000 and an upper face of the diamond crystal making an angle of from substantially 0.degree. to 10.degree. to the face of the substrate, and a semiconductor layer and an electrode layer provided on the diamond crystal, wherein the diamond crystal serves as a heat-radiating layer.
Abstract:
This invention is a method for the controlled growth of single-crystal semiconductor-device-quality films of SiC polytypes on vicinal (0001) SiC wafers with low tilt angles. Both homoepitaxial and heteroepitaxial SiC films can be produced on the same wafer. In particular, 3C-SiC and 6H-SiC films can be produced within selected areas of the same 6H-SiC wafer.
Abstract:
A method of producing sheets of crystalline material is disclosed, as well as devices employing such sheets. In the method, a growth mask is formed upon a substrate and crystalline material is grown at areas of the substrate exposed through the mask and laterally over the surface of the mask to form a sheet of crystalline material. This sheet is optionally separated so that the substrate can be reused. The method has particular importance in forming sheets of crystalline semiconductor material for use in solid state devices.
Abstract:
There is provided a semiconductor article together with a process for producing the same which article has a plurality of semiconductor single crystal regions comprising a semiconductor single crystal region of one electroconductive type and a semiconductor single crystal region of the opposite electroconductive type on the same insulator substrate. At least the semiconductor single crystal region of one electroconductive type being provided by forming a different material which is sufficiently greater in nucleation density than the material of the insulator substrate and sufficiently fine to the extent that only one single nucleus of the semiconductor material can grow and then permitting the semiconductor material to grow around the single nucleus formed as the center.
Abstract:
Intermediate buffer films having a low plastic deformation threshold are provided for absorbing defects due to lattice mismatch and/or thermal coefficient of expansion mismatch between a substrate or layer support and an overlayer while concurrently providing a good template for subsequent crystalline growth at the overlayer. This is accomplished for diamond cubic structure substrates, such as Si or Ge or Si on sapphire or crystalline Si on glass, upon which are to be deposited lattice mismatch overlayers, such as, GaAs or ZnSe. Also, zinc blend type substrates, such as GaAs or InP may be employed with such intermediate buffer films. A characteristic of these intermediate buffer films is a substantially lower plastic deformation threshold compared to either the substrate support or the overlayer to be grown heteroepitaxially thereon. In particular, such high plastic deformable compound materials found suitable for such an intermediate buffer film are cubic III-V, II-VI or a I-VII zinc blend compound materials, respectively and specifically, (Zn.sub.X Cd.sub.Y Hg.sub.1-X-Y)(S.sub.A Se.sub.B Te.sub.1-A-B) and Cu(Cl.sub.X Br.sub.Y I.sub.1-X-Y) wherein X or Y respectively range between 0 and 1 such that X+ Y.ltoreq.1 and A and B respectively range between 0 and 1 such that A+B.ltoreq.1. Particular examples are GaAs, ZnSe, ZnS.sub.x Se.sub.1-x, CdS.sub.x Se.sub.1-x, HgS.sub.x Se.sub.1-x, CuCl, CuBr or CuI, et al.
Abstract translation:提供具有低塑性变形阈值的中间缓冲膜用于吸收由于晶格失配和/或基底或层载体与覆盖层之间的膨胀失配的热系数而引起的缺陷,同时为覆盖层上随后的晶体生长同时提供良好的模板。 这对于金刚石立方结构衬底(例如蓝宝石上的Si或Ge或玻璃上的晶体Si),其上将沉积的晶格失配覆盖层(例如GaAs或ZnSe)而言是完成的。 此外,可以使用诸如GaAs或InP的锌共混型衬底与这种中间缓冲膜。 与衬底支撑体或异质外延生长的覆盖层相比,这些中间缓冲膜的特征是相当低的塑性变形阈值。 特别地,适用于这种中间缓冲膜的这种高塑性可变形化合物材料分别是立方体III-V,II-VI或I-VII锌混合物,分别具体地(ZnXCdYHg1-XY)(SASeBTe1-AB) 和Cu(ClXBrYI1-XY),其中X或Y分别在0和1之间变化,使得X + Y 1和A和B分别在0和1之间变化,使得A + B <1。 具体实例是GaAs,ZnSe,ZnSxSe1-x,CdSxSe1-x,HgSxSe1-x,CuCl,CuBr或CuI等。