21.
    发明专利
    未知

    公开(公告)号:AT297055T

    公开(公告)日:2005-06-15

    申请号:AT97305987

    申请日:1997-08-06

    Applicant: IBM

    Abstract: A structure based on strained Si/SiGe that has high temperature superconductivity is disclosed. The structure for carrying superconducting current includes a substrate (12); a first epitaxial P type semiconductor layer (14), which is under compressive strain, for transporting holes; a second epitaxial barrier layer (20) positioned on the first layer (14); and a third epitaxial N type semiconductor layer (24), which is under tensile strain, for transporting electrons. The barrier layer (30) is thick enough to restrict recombination of electrons and holes, yet the barrier layer (30) is thin enough to permit coulomb force attraction between the electrons and holes to form electron-hole pairs. The first and second layers (14,20) include SiGe, such as Si1.xGex, where x is 0.6-0.8 for the first layer (14), and 0.3-0.4 for the second layer (20). The third layer (24) includes Si.

    25.
    发明专利
    未知

    公开(公告)号:DE19515346A1

    公开(公告)日:1995-11-23

    申请号:DE19515346

    申请日:1995-04-26

    Applicant: IBM

    Abstract: Epitaxial and polycrystalline layers of silicon and silicon-germanium alloys are selectively grown on a semiconductor substrate or wafer by forming over the wafer a thin film masking layer of an oxide of element selected from scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium and then growing the epitaxial layer over the wafer at temperatures below 650 DEG C. The epitaxial and polycrystalline layers do not grow on the masking layer. The invention overcomes the problem of forming epitaxial layers at temperatures above 650 DEG C. by providing a lower temperature process.

    27.
    发明专利
    未知

    公开(公告)号:DE69836654T2

    公开(公告)日:2007-09-27

    申请号:DE69836654

    申请日:1998-06-26

    Applicant: IBM

    Abstract: A structure and method of forming an abrupt doping profile are described. A perferred embodiment incorporates a substrate 32, a first epitaxial layer 36 of Ge less than the critical thickness and having a P or As concentration greater than 5x10 atoms/cc, and a second epitaxial layer 40 having a change in concentration in its first 40 ANGSTROM from the first layer of greater than 1x10 P atoms/cc. In another preferred embodiment, a layer of SiGe having a Ge content greater than 0.5 may be selectively amorphized and recrystalized with respect to other layers in a layered structure. The invention addresses the problem of forming abrupt phosphorus profiles in Si and SiGe layers or films in semiconductor structures such as CMOS, MODFET's, and HBT's.

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