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    • 123. 发明申请
    • VARYING MESA DIMENSIONS IN HIGH CELL DENSITY TRENCH MOSFET
    • 在高密度TRENCH MOSFET中变化的MESA尺寸
    • WO2007089489A2
    • 2007-08-09
    • PCT/US2007001846
    • 2007-01-23
    • FAIRCHILD SEMICONDUCTORWANG QISIM GORDON GEORGE
    • WANG QISIM GORDON GEORGE
    • H01L29/94H01L29/76
    • H01L29/7397H01L29/4236H01L29/42372H01L29/66325H01L29/66348H01L29/66727H01L29/66734H01L29/7808H01L29/7813
    • Circuits, methods, and apparatus for power MOSFETs having a high cell density for a high current carrying capability while maintaining a low pinched-base resistance. One device employs a number of transistor cells having varying mesa (regions between trench gates) sizes. A heavy body etch is utilized in larger cells to reduce the pinched-base resistance. This etch removes silicon in the mesa region, which is then replaced with lower-impedance aluminum. A number of smaller cells that do not receive this etch are used to increase device current capacity. Avalanche current is directed to the larger, lower pinched base cells by ensuring these cells have a lower BVDSS breakdown voltage. The large cell BVDSS can be varied by adjusting the critical dimension or width of the trench gates on either side of the wider mesas, or by adjusting the depth of the heavy body etch.
    • 具有高电流承载能力的高电池密度的功率MOSFET的电路,方法和装置,同时保持低的基极电阻。 一个器件采用具有变化的台面(沟槽栅极之间的区域)尺寸的多个晶体管单元。 在较大的电池中使用重体蚀刻以减少夹持电阻。 该蚀刻去除台面区域中的硅,然后用较低阻抗的铝替代。 使用不接收该蚀刻的多个较小的电池来增加器件电流容量。 通过确保这些电池具有较低的BVDSS击穿电压,雪崩电流被引导到较大的较低压缩的基极电池。 可以通过调节较宽台面两侧的沟槽栅极的临界尺寸或宽度,或通过调整重体蚀刻深度来改变大电池BVDSS。
    • 125. 发明申请
    • MANUFACTURE OF TRENCH-GATE SEMICONDUCTOR DEVICES
    • TRANCH-GATE半导体器件的制造
    • WO2002097876A2
    • 2002-12-05
    • PCT/IB2002/001881
    • 2002-05-27
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.
    • HIJZEN, Erwin, A.IN 'T ZANDT, Michael, A., A.
    • H01L21/336
    • H01L29/7813H01L29/0619H01L29/66348H01L29/7811
    • A vertical power transistor trench-gate semiconductor device has an active area (100) accommodating transistor cells and an inactive area (200) accommodating a gate electrode (25) (Figure 6). While an n-type layer (14) suitable for drain regions still extends to the semiconductor body surface (10a), gate material (11) is deposited in silicon dioxide insulated (17) trenches (20) and planarised to the top of the trenches (20) in the active (100) and inactive (200) areas. Implantation steps then provide p-type channel-accommodating body regions (15A) in the active area (100) and p-type regions (15B) in the inactive area (200), and then source regions (13) in the active area (100). Further gate material (111) is then provided extending from the gate material (11) in the inactive area (200) and onto a top surface insulating layer (17B) for contact with the gate electrode (25). The channel profiles of the device are optimised by providing the p-type regions (15A) after the trench insulation (17), and voltage breakdown at the bottom corners of the trenches (20) is suppressed by providing the p-type regions (15B) in the inactive area (200).
    • 垂直功率沟槽栅场效应晶体管具有容纳晶体管单元的有源区(100)和容纳栅极(25)的无源区(200)。 虽然n型漂移层(14)仍然延伸到半导体主体表面(10a),但是栅极材料(11)沉积在二氧化硅绝缘(17)沟槽(20)中并且平坦化到沟槽(20)的顶部, 在活动(100)和非活动(200)区域。 然后,植入步骤在有源区域(100)中的p型沟道容纳体区域(15A)和非活性区域(200)中的p型区域(15B),然后在有源区域(200)中的源区域(13) 100)。 然后提供从无源区域(200)中的栅极材料(11)延伸到与栅电极焊盘(25)接触的顶表面绝缘层(17B)上的另外的栅极材料(111)。 通过在沟槽绝缘(17)之后提供p型区域(15A)来优化器件的沟道轮廓,并且通过提供p型区域(15B)来抑制沟槽(20)的底角处的电压击穿 )在无效区域(200)中。
    • 126. 发明申请
    • MANUFACTURE OF TRENCH-GATE SEMICONDUCTOR DEVICES
    • 制造具有沟槽门的半导体
    • WO01041206A3
    • 2001-11-08
    • PCT/EP2000/011290
    • 2000-11-10
    • H01L29/78H01L21/331H01L21/336H01L21/338
    • H01L29/66848H01L29/66348H01L29/66666
    • In the manufacture of a trench-gate semiconductor device, for example a MOSFET or an IGBT, a starting semiconductor body (10) has two top layers (13, 15) provided for forming the source and body regions. Gate material (11') is provided in a trench (20) with a trench etchant mask (51, Figure 2) still present so that the gate material (11') forms a protruding step (30) from the adjacent surface (10a) of the semiconductor body, and a side wall spacer (32) is then formed in the step (30) to replace the mask (51). The source region (13) is formed self-aligned with the protruding trench-gate structure with a lateral extent determined by the spacer (32, Figure 5), and the gate (11) is then provided with an insulating overlayer (18, Figure 6). Forming the sidewall spacer (32) when the protruding trench-gate structure has a well-defined edge provided by the gate material (11') allows better definition of the source region (13) compared with a prior-art process in which the gate insulating overlayer is provided in the trench before causing the trench-gate structure to have the protruding step for the sidewall spacer.
    • 本发明涉及制造半导体沟槽栅极,例如MOSFET或IGBT。 初始半导体本体(10)具有形成源区和本体区的两个上层(13,15)。 栅极材料(11')形成在沟槽(20)中,沟槽蚀刻掩模(52,图2)仍然存在,使得栅极材料(11')形成凸起台阶(30) 的半导体本体的相邻表面(10a)。 然后在该步骤(30)中形成间隔件(32)以替换掩模(51)。 源区(13)形成为与突出的沟槽栅极结构自对准,横向延伸由间隔物(32,图5)确定。 然后门(11)设有绝缘覆盖层(18,图6)。 当突出的沟槽栅极结构具有由栅极材料(11')提供的明确限定的边缘时,间隔元件(32)的形成使得可以更好地限定源极区域(13) 本技术是在沟槽门结构具有间隔件的突出步骤之前将门绝缘层覆盖在沟槽中。
    • 128. 发明申请
    • MANUFACTURE OF TRENCH-GATE SEMICONDUCTOR DEVICES
    • 制造具有沟槽门的半导体
    • WO01024251A2
    • 2001-04-05
    • PCT/EP2000/009408
    • 2000-09-25
    • H01L29/78H01L21/331H01L21/336H01L21/338H01L29/739H01L29/80H01L29/812
    • H01L29/66348
    • A trench-gate semiconductor device, for example a MOSFET or IGBT, of compact geometry is manufactured with self-aligned masking techniques in a simple process with good reproducibility. The source region (13) of the device is formed by introducing dopant (63) into an area of the body region (15) via a mask window (51a), diffusing the dopant to form a surface region (13b) that extends laterally below the mask (51) at a distance (d) beyond the masking edge (51b) of the window (51a), and then etching the body (10) at the window (51a) to form a trench (20) for the trench-gate (11) with a lateral extent (y) that is determined by the etching of the body (10) at the masking edge (51b) of the window (51a). A portion of the surface region (13b) is left to provide the source region (13) adjacent to the trench (20). The invention permits the etch edge definition for the trench (2) to be better controlled by using the masking edge (51b) of a well-defined mask (51), as compared with the less well defined edges that tend to result from the use of a side-wall extension in prior-art processes.
    • 根据本发明,使用自对准掩模技术制造具有紧凑几何结构的诸如MOSFET或IGBT的半导体器件,作为具有良好再现性的简单工艺的一部分。 器件的源极区(13)通过掺杂剂(63)通过掩模窗(51a)通过扩散掺杂剂而形成到体区(15)的区域中以形成 一个表面区域(13b),该表面区域(13b)在该掩模(51)的下方横向延伸超过该窗口(51a)的掩蔽边缘(51b)的距离(d),然后通过蚀刻该主体(10); )在窗口(51a)处以形成用于沟槽栅极(11)的沟槽(20),具有通过在掩蔽边缘(10)处蚀刻主体 (51a)的开口(51b)。 表面区域(13b)的一部分留下作为与沟槽(20)相邻的源极区域(13)。 本发明使得可以通过使用明确限定的掩模(51)的掩蔽边缘(51b)与可以引起的不太确定的边缘相比更好地限定沟槽(2)的蚀刻边缘。 通过现有技术中的侧壁的延伸。
    • 129. 发明申请
    • MANUFACTURE OF FIELD-EFFECT SEMICONDUCTOR DEVICES
    • 场效应半导体器件的制造
    • WO9954919A3
    • 2000-03-02
    • PCT/IB9900538
    • 1999-03-29
    • KONINKL PHILIPS ELECTRONICS NVPHILIPS SVENSKA AB
    • LUO JIKUI
    • H01L29/78H01L21/331H01L21/336
    • H01L29/66348
    • The manufacture of a semiconductor device, for example a MOSFET of the trench-gate type of an IGBT, includes the steps of: forming at a surface (10a) of a semiconductor body (10) a first mask (53) having a window (53a), forming a localised region (15b) to improve the blocking/breakdown characteristics by introducing dopant (62) into a first area of the body via the window (53a), and thermally diffusing the localised region (15b) to a greater depth than the channel-accommodating region (15a) before providing a source region (13). A second mask (51) of complementary window pattern to the first mask (53) is formed by providing a differently-etchable material (51') in the first window (53a) and then etch-removing the first mask (53) while leaving the second mask (51) at the first area where the localised region (15b) is present. The source region (13) is formed by introducing dopant (63) of the opposite conductivity type into a second area at the complementary window (51a) while masking the first area with the second mask (51). The gate (11) is provided at the second area, adjacent to where a body region (15) provides the channel-accommodating region (15a). A source electrode (23) is provided after removing the second mask (51), so as to contact the opposite conductivity type regions (13, 15b) at the surface (10a).
    • 半导体器件(例如,沟槽栅极型IGBT的MOSFET)的制造包括以下步骤:在半导体本体(10)的表面(10a)处形成具有窗口的第一掩模(53) 通过经由窗口(53a)将掺杂剂(62)引入到主体的第一区域中,形成局部区域(15b)以改善阻挡/击穿特性,并且将局部区域(15b)热扩散到更大的深度 比在提供源区域(13)之前的通道容纳区域(15a)更好。 通过在第一窗口(53a)中提供不同可蚀刻的材料(51'),然后在离开时蚀刻去除第一掩模(53)来形成与第一掩模(53)互补的窗口图案的第二掩模(51) 位于存在局部区域(15b)的第一区域处的第二掩模(51)。 源区域(13)通过将具有相反导电类型的掺杂剂(63)引入互补窗口(51a)的第二区域中,同时用第二掩模(51)掩蔽第一区域而形成。 栅极(11)设置在第二区域处,邻近主体区域(15)提供通道容纳区域(15a)的位置。 在去除第二掩模(51)之后提供源电极(23),以便在表面(10a)处接触相对的导电类型区域(13,15b)。
    • 130. 发明申请
    • MANUFACTURE OF TRENCH-GATE SEMICONDUCTOR DEVICES
    • TRANCH-GATE半导体器件的制造
    • WO9954918A3
    • 2000-02-24
    • PCT/IB9900537
    • 1999-03-29
    • KONINKL PHILIPS ELECTRONICS NVPHILIPS SVENSKA AB
    • LUO JIKUI
    • H01L29/78H01L21/331H01L21/336H01L21/8234H01L27/082H01L27/088
    • H01L21/823487H01L27/0823H01L27/088H01L29/66348
    • The manufacture of a trench-gate semiconductor device, for example a MOSFET or IGBT, includes the steps of forming at a surface (10a) of a semiconductor body (10) a first mask (51) having a first window (51a), and later forming a second mask (52) having a smaller window (52a) by providing sidewall extensions (52b) on the first mask (51). A source region (13) is formed by dopant (63) introduced via the first window (51a), whereas a trench (20) is etched at the smaller window (52a) to extend through a body region (15) and into an underlying portion of a drain region (14). The gate (11) is provided in the trench (20) adjacent to where the channel (12) of the device is accommodated. After removing the second mask (52), a source electrode (23) is provided to contact the source region (13) and an adjacent region (15) of the body (10) at the surface (10a). This method permits the use of self-aligned masking techniques while providing good reproduceability in the doping of the source region (13) and adjacent region (15) and in the contact area of the source electrode (23) with both the source region (13) and the adjacent region (15).
    • 沟槽栅极半导体器件(例如MOSFET或IGBT)的制造包括以下步骤:在半导体本体(10)的表面(10a)处形成具有第一窗口(51a)的第一掩模(51),以及 稍后通过在第一掩模(51)上提供侧壁延伸部(52b)形成具有较小窗口(52a)的第二掩模(52)。 源区域(13)由通过第一窗口(51a)引入的掺杂剂(63)形成,而沟槽(20)在较小窗口(52a)处被蚀刻以延伸通过体区域(15)并进入下面的 漏区(14)的一部分。 门(11)设置在相邻于容纳通道(12)的位置的沟槽(20)中。 在去除第二掩模(52)之后,提供源极(23)以在表面(10a)处接触源极区域(13)和主体(10)的相邻区域(15)。 该方法允许使用自对准掩蔽技术,同时在源极区域(13)和相邻区域(15)的掺杂以及源电极(23)与源区域(13)的接触区域中提供良好的可再生性 )和相邻区域(15)。