Lateral Field-Effect Transistor Having an Insulated Trench Gate Electrode
    11.
    发明申请
    Lateral Field-Effect Transistor Having an Insulated Trench Gate Electrode 有权
    具有绝缘沟槽栅电极的侧向场效应晶体管

    公开(公告)号:US20080203473A1

    公开(公告)日:2008-08-28

    申请号:US10561732

    申请日:2004-06-10

    IPC分类号: H01L29/78

    摘要: A field-effect transistor having cells (18) each having a source region (22), source body region (26), drift region (20), drain body region (28) and drain region (24) arranged longitudinally, laterally alternating with structures to achieve a reduced surface field. In embodiments, the structures can include longitudinally spaced insulated gate trenches (35) defining a gate region (31) adjacent the source or drain region (22, 24) and a longitudinally extending potential plate region (33) adjacent the drift region (20). Alternatively, a separate potential plate region (33) or a longitudinally extending semi-insulating field plate (50) may be provided adjacent the drift region (20). The transistor is suitable for bi-directional switching.

    摘要翻译: 一种具有单元(18)的场效应晶体管,每个单元具有源区域(22),源体区域(26),漂移区域(20),漏极体区域(28)和漏极区域(24) 结构实现减少的表面场。 在实施例中,结构可以包括限定邻近源极或漏极区域(22,24)的栅极区域(31)和邻近漂移区域(20)的纵向延伸的电位板区域(33)的纵向隔开的绝缘栅极沟槽(35) 。 或者,可以在漂移区域(20)附近设置单独的电位板区域(33)或纵向延伸的半绝缘场板(50)。 晶体管适用于双向开关。

    Manufacture of trench-gate semiconductor devices
    12.
    发明授权
    Manufacture of trench-gate semiconductor devices 有权
    沟槽栅半导体器件的制造

    公开(公告)号:US07332398B2

    公开(公告)日:2008-02-19

    申请号:US10538214

    申请日:2003-12-08

    IPC分类号: H01L21/336

    摘要: A method of manufacturing a trench-gate semiconductor device (1), the method including forming trenches (20) in a semiconductor body (10) in an active transistor cell area of the device, the trenches (20) each having a trench bottom and trench sidewalls, and providing silicon oxide gate insulation (21) in the trenches such that the gate insulation (33) at the trench bottoms is thicker than the gate insulation (21) at the trench sidewalls in order to reduce the gate-drain capacitance of the device. The method includes, after forming the trenches (20), the steps of: (a) forming a silicon oxide layer (21) at the trench bottoms and trench sidewalls; (b) depositing a layer of doped polysilicon (31) adjacent the trench bottoms and trench side walls; (c) forming silicon nitride spacers (32) on the doped polysilicon (21) adjacent the trench sidewalls leaving the doped polysilicon exposed at the trench bottoms; (d) thermally oxidising the exposed doped polysilicon to grow said thicker gate insulation (33) at the trench bottoms; (e) removing the silicon nitride spacers (32); and (f) depositing gate conductive material (34) within the trenches to form a gate electrode for the device. The final thickness of the thicker gate insulation (33) at the trench bottoms is well controlled by the thickness of the layer of doped polysilicon (31) deposited in step (b). Also the doped (preferably greater than 5 e 19 cm-3) polysilicon oxidises fast at low temperatures (preferably 700-800° C.), reducing the risk of diffusing (e.g. p body) implantations present in the device at that stage.

    摘要翻译: 一种制造沟槽栅极半导体器件(1)的方法,所述方法包括在器件的有源晶体管单元区域中的半导体本体(10)中形成沟槽(20),所述沟槽(20)各自具有沟槽底部和 沟槽侧壁,并且在沟槽中提供氧化硅栅极绝缘体(21),使得在沟槽底部处的栅极绝缘体(33)比沟槽侧壁处的栅极绝缘体(21)更厚,以便降低栅极 - 漏极电容 装置。 该方法包括在形成沟槽(20)之后的步骤:(a)在沟槽底部和沟槽侧壁处形成氧化硅层(21); (b)在沟槽底部和沟槽侧壁附近沉积一层掺杂多晶硅(31); (c)在与沟槽侧壁相邻的掺杂多晶硅(21)上形成氮化硅间隔物(32),留下在沟槽底部暴露的掺杂多晶硅; (d)热氧化暴露的掺杂多晶硅以在沟槽底部生长所述较厚的栅极绝缘体(33); (e)去除氮化硅间隔物(32); 和(f)在所述沟槽内淀积栅极导电材料(34)以形成所述器件的栅电极。 沟槽底部较厚的栅极绝缘体(33)的最终厚度由步骤(b)中沉积的掺杂多晶硅层(31)的厚度很好地控制。 此外,掺杂(优选大于5埃19厘米3)的多晶硅在低温(优选700-800℃)下快速氧化,降低了在该阶段存在于器件中的扩散(例如p体)植入的风险。

    Edge termination in MOS transistors
    15.
    发明授权
    Edge termination in MOS transistors 有权
    MOS晶体管的边缘端接

    公开(公告)号:US06936890B2

    公开(公告)日:2005-08-30

    申请号:US10236175

    申请日:2002-09-06

    摘要: A RESURF trench gate MOSFET has a sufficiently small pitch (close spacing of neighbouring trenches) that intermediate areas of the drain drift region are depleted in the blocking condition of the MOSFET. However, premature breakdown can still occur in this known device structure at the perimeter/edge of the active device area and/or adjacent the gate bondpad. To counter premature breakdown, the invention adopts two principles: the gate bondpad is either connected to an underlying stripe trench network surrounded by active cells, or is directly on top of the active cells, and a compatible 2D edge termination scheme is provided around the RESURF active device area. These principles can be implemented in various cellular layouts e.g. a concentric annular device geometry, which may be circular or rectangular or ellipsoidal, in the active area and in the edge termination, or a device array of such concentric hexagonal or circular stripe cells, or a device array of square active cells with stripe edge cells, or a device array of hexagonal active cells with an edge termination of hexagonal edge cells.

    摘要翻译: RESURF沟槽栅极MOSFET具有足够小的间距(相邻沟槽的紧密间隔),漏极漂移区的中间区域在MOSFET的阻塞状态下耗尽。 然而,在已知的器件结构中,在有源器件区域的周边/边缘处和/或与栅极接合焊盘相邻处,仍然会发生过早击穿。 为了防止过早击穿,本发明采用两个原则:栅极接合板或者连接到由有源单元包围的底层条纹沟槽网络,或者直接位于有源单元的顶部,并且在RESURF周围提供兼容的2D边缘终端方案 有源设备区域。 这些原理可以在各种蜂窝布局中实现,例如。 在活动区域​​和边缘终止中可以是圆形或矩形或椭圆形的同心环形装置几何形状,或这种同心六边形或圆形条纹细胞的装置阵列,或具有条纹边缘细胞的方形活性细胞的装置阵列 ,或具有六边形边缘单元的边缘终止的六边形活性单元的器件阵列。

    Field-effect semiconductor devices
    16.
    发明授权
    Field-effect semiconductor devices 有权
    场效半导体器件

    公开(公告)号:US06600194B2

    公开(公告)日:2003-07-29

    申请号:US09803325

    申请日:2001-03-09

    IPC分类号: H01L2976

    摘要: A field-effect semiconductor device, for example a MOSFET of the trench-gate type, comprises side-by-side device cells at a surface (10a) of a semiconductor body (10), and at least one drain connection (41) that extends in a drain trench (40) from the body surface (10a) to an underlying drain region (14a). A channel-accommodating region (15) of the device extends laterally to the drain trench (40). The drain trench (40) extends through the thickness of the channel-accommodating region (15) to the underlying drain region (14a), and the drain connection (41) is separated from the channel-accommodating region (15) by an intermediate insulating layer (24) on side-walls of the drain trench (40). A compact cellular layout can be achieved, with a significant proportion of the total cellular layout area accommodating conduction channels (12). The configuration in a discrete device avoids a need to use a substrate conduction path and so advantageously reduces the ON resistance of the device.

    摘要翻译: 场效应半导体器件(例如沟槽栅型MOSFET)包括在半导体本体(10)的表面(10a)处的并排器件单元,以及至少一个漏极连接(41),其中, 在漏极沟槽(40)中从主体表面(10a)延伸到下面的漏极区域(14a)。 器件的通道容纳区域(15)横向延伸到漏极沟槽(40)。 漏极沟槽(40)通过沟道容纳区域(15)的厚度延伸到下面的漏极区域(14a),并且漏极连接部分(41)通过中间绝缘体与沟道容纳区域(15)分离 层(24)在排水沟槽(40)的侧壁上。 可以实现紧凑的蜂窝布局,其中大部分的总细胞布局区域容纳传导通道(12)。 分立器件中的配置避免了使用衬底传导路径的需要,因此有利地降低了器件的导通电阻。

    Trenched Schottky rectifiers
    17.
    发明授权
    Trenched Schottky rectifiers 有权
    倾斜肖特基整流器

    公开(公告)号:US06441454B2

    公开(公告)日:2002-08-27

    申请号:US09773412

    申请日:2001-02-01

    IPC分类号: H01L27095

    摘要: 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).

    摘要翻译: 沟槽肖特基整流器(1a; 1b; 1c; 1d)的内沟槽(11)结合了多个整流器区域(43a),其中肖特基电极(3)形成具有漂移区域(4)的肖特基势垒43。 周边沟槽(18)围绕多个整流器区域(43a)的外周延伸。 这些沟槽(11,18)适应连接到肖特基电极(3)的相应的内部场电极(31)和周边场电极(38)。 内部场电极(11)通过对内部沟槽(11)进行导线的电介质材料(21)电容耦合到漂移区域(4)。 周边场电极(38)电容耦合在周边沟槽18的内壁(18a)上的介电材料(28)上,而不作用在任何外壁(18b)上。 此外,内部和周边沟槽(11,18)紧密地间隔开,并且漂移区域(4)的中间区域(4a,4b)被低掺杂。 间隔非常接近,并且掺杂如此之低,使得在漂移区(4)中形成的来自肖特基势垒(43)和从场释放区(31,21; 38,28)形成的耗尽层(40) 在整流器的阻塞状态下,可能在刚好低于击穿电压的阻塞电压下消耗沟槽(11,18)之间的整个中间区域(4a,4b)。 这种布置降低了可能在耗尽层(40)中的高场点发生的过早击穿的风险,特别是在整流器区域阵列(43a)的周边。

    Trench MOSFET
    18.
    发明授权
    Trench MOSFET 有权
    沟槽MOSFET

    公开(公告)号:US07696599B2

    公开(公告)日:2010-04-13

    申请号:US10580619

    申请日:2004-11-26

    IPC分类号: H01L29/93 H01L21/336

    摘要: A trench MOSFET with drain (8), drift region (10) body (12) and source (14). In order to improve the figure of merit for use of the MOSFET as control and sync FETs, the trench (20) is partially filled with dielectric (24) adjacent to the drift region (10) and a graded doping profile is used in the drift region (10).

    摘要翻译: 具有漏极(8),漂移区(10)主体(12)和源极(14)的沟槽MOSFET。 为了改善使用MOSFET作为控制和同步FET的品质因数,沟槽(20)部分地被与漂移区(10)相邻的电介质(24)填充,并且在漂移中使用渐变掺杂分布 区域(10)。

    Lateral field-effect transistor having an insulated trench gate electrode
    19.
    发明授权
    Lateral field-effect transistor having an insulated trench gate electrode 有权
    具有绝缘沟槽栅极的横向场效应晶体管

    公开(公告)号:US07671440B2

    公开(公告)日:2010-03-02

    申请号:US10561732

    申请日:2004-06-10

    IPC分类号: H01L29/76

    摘要: A field-effect transistor having cells (18) each having a source region (22), source body region (26), drift region (20), drain body region (28) and drain region (24) arranged longitudinally, laterally alternating with structures to achieve a reduced surface field. In embodiments, the structures can include longitudinally spaced insulated gate trenches (35) defining a gate region (31) adjacent the source or drain region (22, 24) and a longitudinally extending potential plate region (33) adjacent the drift region (20). Alternatively, a separate potential plate region (33) or a longitudinally extending semi-insulating field plate (50) may be provided adjacent the drift region (20). The transistor is suitable for bi-directional switching.

    摘要翻译: 一种具有单元(18)的场效应晶体管,每个单元具有源区域(22),源体区域(26),漂移区域(20),漏极体区域(28)和漏极区域(24) 结构实现减少的表面场。 在实施例中,结构可以包括限定邻近源极或漏极区域(22,24)的栅极区域(31)的纵向间隔开的绝缘栅极沟槽(35)和邻近漂移区域(20)的纵向延伸的电位板区域(33) 。 或者,可以在漂移区域(20)附近设置单独的电位板区域(33)或纵向延伸的半绝缘场板(50)。 晶体管适用于双向开关。