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    • 2. 发明申请
    • VERTICAL SEMICONDUCTOR DEVICES AND METHODS OF MANUFACTURING SUCH DEVICES
    • 垂直半导体器件和制造这种器件的方法
    • WO2006025035A2
    • 2006-03-09
    • PCT/IB2005/052873
    • 2005-09-01
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.ROCHEFORT, ChristelleHIJZEN, Erwin, A.MEUNIER-BEILLARD, Philippe
    • ROCHEFORT, ChristelleHIJZEN, Erwin, A.MEUNIER-BEILLARD, Philippe
    • H01L29/78H01L29/06H01L21/336
    • H01L29/7802H01L29/0634H01L29/0649H01L29/0653H01L29/66712H01L29/7813
    • A vertical semiconductor device, for example a trench-gate MOSFET power transistor (1), has a drift region (12) of one conductivity type containing spaced vertical columns (30) of the opposite conductivity type for charge compensation increase of the device breakdown voltage. Insulating material (31) is provided on the sidewalls only of trenches (20) in the drift region (12) and the opposite conductivity type material is epitaxially grown from the bottom of the trenches (20). The presence of the sidewall insulating material (31) prevents any defects in the charge compensation columns crossing into the drain drift material which therefore prevents any excessive leakage currents in the device (1). The insulating material (31) also prevents epitaxial growth on the trench sidewalls and hence substantially prevents forming voids in the trenches which would lessen the accuracy of charge compensation. The epitaxial growth by this method can be well controlled and may be stopped at an upper level (21) below the top major surface (10a). Thus, for example,20 trench-gates 22, 23 may be formed in the same trenches (20) above the compensation columns (30).
    • 垂直半导体器件(例如沟槽栅极MOSFET功率晶体管(1))具有一种导电类型的漂移区(12),其包含相反导电类型的间隔开的垂直列(30),用于 器件击穿电压的电荷补偿增加。 仅在漂移区(12)中的沟槽(20)的侧壁上提供绝缘材料(31),并且相反导电类型的材料从沟槽(20)的底部外延生长。 侧壁绝缘材料(31)的存在防止电荷补偿柱中的任何缺陷穿过漏极漂移材料,从而防止器件(1)中的任何过量泄漏电流。 绝缘材料(31)还防止在沟槽侧壁上的外延生长,并因此基本上防止在沟槽中形成空隙,这会降低电荷补偿的准确性。 通过该方法的外延生长可以被很好地控制,并且可以停止在顶部主表面(10a)下方的上层(21)处。 因此,例如,可以在补偿柱(30)上方的相同沟槽(20)中形成20个沟槽栅极22,23。