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    • 3. 发明申请
    • SELF-ALIGNED SILICON CARBIDE SEMICONDUCTOR DEVICES AND METHODS OF MAKING THE SAME
    • 自对准硅碳化硅半导体器件及其制造方法
    • WO2005089303A2
    • 2005-09-29
    • PCT/US2005/008526
    • 2005-03-14
    • SEMISOUTH LABORATORIES, INC.SANKIN, IgorCASADY, Jana B.MERRETT, Joseph N.
    • SANKIN, IgorCASADY, Jana B.MERRETT, Joseph N.
    • H01L29/15H01L31/0312
    • H01L29/66068H01L29/1608H01L29/2003H01L29/42316H01L29/45H01L29/66863H01L29/8128
    • A self-aligned silicon carbide power MESFET with improved current stability and a method of making the device are described. The device, which includes raised source and drain regions separated by a gate recess, has improved current stability as a result of reduced surface trapping effects even at low gate biases. The device can be made using a self-aligned process in which a substrate comprising an n + -doped SiC layer on an n-doped SiC channel layer is etched to define raised source and drain regions (e.g., raised fingers) using a metal etch mask. The metal etch mask is then annealed to form source and drain ohmic contacts. A single- or multilayer dielectric film is then grown or deposited and anisotropically etched. A Schottky contact layer and a final metal layer are subsequently deposited using evaporation or another anisotropic deposition technique followed by an optional isotropic etch of dielectric layer or layers.
    • 描述了具有改善的电流稳定性的自对准碳化硅功率MESFET和制造该器件的方法。 包括由栅极凹槽分开的升高的源极和漏极区域的器件由于即使在低栅极偏置处减小的表面俘获效应也具有改善的电流稳定性。 可以使用自对准工艺来制造器件,其中在n掺杂的SiC沟道层上包括掺杂n + n的SiC层的衬底被蚀刻以使用一个(例如,凸起的指状物)来限定凸起的源极和漏极区域 金属蚀刻掩模。 然后将金属蚀刻掩模退火以形成源极和漏极欧姆接触。 然后生长或沉积单层或多层介电膜并进行各向异性蚀刻。 随后使用蒸发或其他各向异性沉积技术沉积肖特基接触层和最后的金属层,随后对介电层或层进行任意的各向同性蚀刻。
    • 5. 发明申请
    • NOVEL STRUCTURES OF SILICON CARBIDE METAL SEMICONDUCTOR FIELD EFFECT TRANSISTORS FOR HIGH VOLTAGE AND HIGH POWER APPLICATIONS
    • 用于高电压和高功率应用的碳化硅金属半导体场效应晶体管的新结构
    • WO2005114746A1
    • 2005-12-01
    • PCT/SG2005/000152
    • 2005-05-18
    • NANYANG TECHNOLOGICAL UNIVERSITYRUSLIZHU, Chunlin
    • RUSLIZHU, Chunlin
    • H01L29/812
    • H01L29/1608H01L29/66068H01L29/8128
    • A silicon carbide metal semiconductor field effect transistor (MESFET) that includes a double-channel layer, with the lower channel being higher doped than the upper channel and a recessed gate. The higher doped lower channel layer is used to increase the channel current while the lower doped upper channel layer is used to improve the gate-drain breakdown voltage. A part of the gate nearer to the source is buried so as to allow a wider channel opening outside the buried gate region, and consequently reduce the source and drain resistances. The unburied gate nearer to the drain functions as a field plate and decreases the electric field crowding at the corner of the buried gate nearer to the drain and hence improves the gate-drain breakdown voltage. Overall a higher operating voltage and higher output power density for the MESFET is attainable.
    • 一种包括双沟道层的碳化硅金属半导体场效应晶体管(MESFET),其下部沟道的掺杂比上部沟道高,并且具有凹入栅极。 较高掺杂的下沟道层用于增加沟道电流,而下掺杂上沟道层用于提高栅 - 漏击穿电压。 靠近源极的栅极的一部分被埋入,以允许在掩埋栅极区域外部开口的较宽的沟道,从而减小源极和漏极电阻。 靠近漏极的未饱和栅极起到场板的作用,并且减小了靠近漏极的掩埋栅极拐角处的电场拥挤,从而提高了栅极 - 漏极击穿电压。 总体而言,可以实现MESFET的更高的工作电压和更高的输出功率密度。