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    • 5. 发明授权
    • Heterojunction FET with doubly-doped channel
    • 具有双掺杂沟道的异质结FET
    • US4673959A
    • 1987-06-16
    • US686661
    • 1984-12-27
    • Yasuhiro ShirakiYoshifumi KatayamaYoshimasa MurayamaMakoto MoriokaYasushi SawadaTomoyoshi MishimaTakao KurodaEiichi Maruyama
    • Yasuhiro ShirakiYoshifumi KatayamaYoshimasa MurayamaMakoto MoriokaYasushi SawadaTomoyoshi MishimaTakao KurodaEiichi Maruyama
    • H01L29/812H01L21/338H01L29/205H01L29/423H01L29/778H01L29/80
    • H01L29/42316H01L29/7781H01L29/7786
    • There is disclosed a semiconductor device comprising at least first and second semiconductor layers positioned to form a hetero-junction therebetween, such a hetero-junction being adapted to form a channel, means for controlling carriers, and source and drain areas on opposite edges of the channel, wherein the first and second semiconductor layers formed between the source and drain regions have an area containing only 10.sup.16 cm.sup.-3 or less of an impurity; the first semiconductor layer has a wider forbidden band than that of the second semiconductor layer; and further including at least one semiconductor layer having a higher activation efficiency of impurities than that of the first semiconductor layer, with such at least one semiconductor layer being located on the side of the first semiconductor layer not in contact with the second semiconductor layer. A multi-quantum well structure may be used as the higher impurity activation efficiency semiconductor layer. The electrical resistance in the semiconductor area constituting the source and drain regions can be lowered by utilizing such a higher impurity activation efficiency semiconductor layer.
    • 公开了一种半导体器件,其至少包括第一和第二半导体层,该第一和第二半导体层被定位以在它们之间形成异质结,这样的异质结适于形成沟道,用于控制载流子的装置,以及在其的相对边缘上的源极和漏极区域 沟道,其中形成在源区和漏区之间的第一和第二半导体层具有仅含有1016cm-3或更小的杂质的面积; 第一半导体层具有比第二半导体层更宽的禁带; 并且还包括至少一个具有比第一半导体层高的杂质活化效率的半导体层,这样的至少一个半导体层位于不与第二半导体层接触的第一半导体层的一侧。 可以使用多量子阱结构作为较高的杂质活化效率半导体层。 通过利用这种较高的杂质活化效率的半导体层,可以降低构成源区和漏区的半导体区的电阻。
    • 8. 发明授权
    • Semiconductor laser device
    • 半导体激光器件
    • US5491709A
    • 1996-02-13
    • US106700
    • 1993-08-16
    • Yasuji SekoHiromi OtomaNobuaki UekiHideki FukunagaHideo NakayamaKiichi UeyanagiYasuhiro Shiraki
    • Yasuji SekoHiromi OtomaNobuaki UekiHideki FukunagaHideo NakayamaKiichi UeyanagiYasuhiro Shiraki
    • H01S5/00H01S5/042H01S5/20H01S5/32H01S5/323H01S5/34H01S5/343H01S3/19
    • B82Y20/00H01S5/32325H01S5/34326H01S5/2009H01S5/3211H01S5/3406H01S5/3407
    • In a semiconductor laser device according to the invention, a clad layer includes first clad layers, each of which has a greater band gap than an active layer and has a thickness of 0.003 to 0.3 .mu.m, and second clad layers each of which has a lower refractive index than the active layer, and the first clad layers are disposed nearer to the active layer than the second clad layers, respectively. In this structure, the first clad layers confine carriers in the active layer while the second clad layers confine the light in the active layer. Since each of the first clad layers is formed of a thin film, the carriers are hard to move outwardly from the active layer due to the tunnel phenomenon thereof and, even if the lattice constant thereof is slightly different, the first clad layer can be lattice matched to a substrate. For this reason, the materials of the second clad layers can be selected without taking into consideration the size of the band gap thereof. This makes it possible to reduce the oscillation threshold value current density of the laser as well as to improve the temperature characteristic of the laser.
    • 在根据本发明的半导体激光器件中,包覆层包括第一覆盖层,其每一个具有比有源层更大的带隙,并且具有0.003至0.3μm的厚度,以及第二覆盖层具有 比有源层​​低的折射率,并且第一包层分别设置成比第二包层更靠近有源层。 在该结构中,第一覆盖层将载流子限制在有源层中,而第二覆盖层将光限制在有源层中。 由于每个第一包层由薄膜形成,所以载流子由于其隧道现象而难以从有源层向外移动,并且即使其晶格常数稍微不同,第一覆层可以是晶格 与底物匹配。 为此,可以选择第二包层的材料而不考虑其带隙的尺寸。 这使得可以减小激光器的振荡阈值电流密度以及提高激光器的温度特性。
    • 9. 发明授权
    • Multiquantum barrier laser having high electron and hole reflectivity of
layers
    • 具有高层电子和空穴反射率的多电极势垒激光器
    • US5425041A
    • 1995-06-13
    • US214235
    • 1994-03-17
    • Yasuji SekoKiichi UeyanagiYasuhiro Shiraki
    • Yasuji SekoKiichi UeyanagiYasuhiro Shiraki
    • H01S5/00H01S5/20H01S5/343H01S3/19
    • B82Y20/00H01S5/20H01S5/2013H01S5/34326
    • It is an object of the present invention to provide a highly efficient semiconductor laser unit having excellent temperature characteristics, in which electrons or holes are suppressed from overflowing from the active layer to the cladding layers while the threshold of current density is maintained low. The present invention is to provide a semiconductor laser unit fundamentally composed of an active layer and cladding layers in which the active layer is interposed between the cladding layers the semiconductor laser unit comprising: a multiquantum barrier layer including well layers and barrier layers disposed between the active layer and the cladding layers or disposed in the cladding layers close to the active layer, wherein the well and barrier layers have a high reflectivity with respect to the electrons and holes at a position close to .GAMMA.-point in the reciprocal lattice space, and also the well and barrier layers have a high reflectivity with respect to the electrons and holes at a position close to at least one of the primary symmetrical points.
    • 本发明的目的是提供一种具有优异的温度特性的高效半导体激光器单元,其中电子或空穴被抑制从有源层溢出到包覆层,同时电流密度的阈值保持较低。 本发明提供一种半导体激光器单元,其主要由有源层和包层组成,其中有源层介于包层之间,半导体激光单元包括:多量级阻挡层,包括阱层和位于活性层之间的势垒层 层和包层,或者设置在靠近有源层的包覆层中,其中阱和势垒层相对于在互易格子空间中靠近GAMMA-point的位置处的电子和空穴具有高反射率,并且还 阱和阻挡层相对于接近至少一个主要对称点的位置处的电子和空穴具有高反射率。