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    • 10. 发明申请
    • TRENCHED SCHOTTKY RECTIFIERS
    • 带凹槽的肖特基整流器
    • WO0157915A3
    • 2001-12-20
    • PCT/EP0100657
    • 2001-01-22
    • KONINKL PHILIPS ELECTRONICS NV
    • HIJZEN ERWIN AHUETING RAYMOND J E
    • H01L29/40H01L29/47H01L29/872
    • H01L29/407H01L29/872H01L29/8725
    • Inner trenches (11) of a trenched Schottky rectifier (1a; 1b; 1c; 1d) bound a plurality of rectifier areas (43a) where the Schottky electrode (3) forms a Schottky barrier 43 with a drift region (4). A perimeter trench (18) extends around the outer perimeter of the plurality of rectifier areas (43a). These trenches (11, 18) accommodate respective inner field-electrodes (31) and a perimeter field-electrode (38) that are connected to the Schottky electrode (3). The inner field-electrodes (11) are capacitively coupled to the drift region (4) via dielectric material (21) that lines the inner trenches (11). The perimeter field-electrode (38) is capacitively coupled across dielectric material (28) on the inside wall (18a) of the perimeter trench 18, without acting on any outside wall (18b). Furthermore, the inner and perimeter trenches (11, 18) are closely spaced and the intermediate areas (4a, 4b) of the drift region (4) are lowly doped. The spacing is so close and the doping is so low that the depletion layer (40) formed in the drift region (4), from the Schottky barrier (43) and from the field-relief regions (31,21; 38,28) in the blocking state of the rectifier, may deplete the whole of the intermediate areas (4a, 4b) between the trenches (11, 18) at a blocking voltage just below the breakdown voltage. This arrangement reduces the risk of premature breakdown that can occur at high field points in the depletion layer (40), especially at the perimeter of the array of rectifier areas (43a).
    • 沟槽式肖特基整流器(1a; 1b; 1c; 1d)的内部沟槽(11)界定了肖特基电极(3)与漂移区(4)形成肖特基势垒43的多个整流区域(43a)。 周边沟槽(18)围绕多个整流器区域(43a)的外周边延伸。 这些沟槽(11,18)容纳连接到肖特基电极(3)的相应的内部场电极(31)和周边场电极(38)。 内部场电极(11)经由布置内部沟槽(11)的介电材料(21)电容耦合到漂移区(4)。 周边场电极(38)在周边沟槽18的内壁(18a)上的电介质材料(28)上电容耦合,而不作用在任何外壁(18b)上。 此外,内部和周边沟槽(11,18)紧密间隔并且漂移区(4)的中间区域(4a,4b)低度掺杂。 该间隔非常接近并且掺杂非常低以至于形成在漂移区(4)中的肖特基势垒(43)和场抑制区(31,21; 38,28)中的耗尽层(40) 在整流器的阻断状态下,可以在正好低于击穿电压的阻断电压下耗尽沟槽(11,18)之间的整个中间区域(4a,4b)。 这种布置降低了在耗尽层(40)中的高场点处,特别是在整流器区域阵列(43a)的周边处可能发生的过早击穿的风险。