Low voltage DMOS transistor
    5.
    发明授权
    Low voltage DMOS transistor 失效
    低电压DMOS晶体管

    公开(公告)号:US5825065A

    公开(公告)日:1998-10-20

    申请号:US782875

    申请日:1997-01-14

    摘要: A method of fabricating a semiconductor device containing a HVDMOS transistor and a LVDMOS transistor and the device which includes providing a region of semiconductor material of a first conductivity type and forming a high voltage DMOS transistor disposed in the region. A relatively low voltage DMOS transistor is also disposed in that region and electrically isolated from the high voltage DMOS transistor. The low voltage DMOS transistor has spaced apart source and drain regions disposed in the region of semiconductor material and a back gate region of the first conductivity type disposed in the region of semiconductor material between the source and drain regions. The back gate region is electrically coupled to the region of semiconductor material. The region of semiconductor material includes a surface, the source, drain and back gate regions extending to that surface. A well of second conductivity type opposite to the first conductivity type is provided in the region of semiconductor material and the high voltage DMOS transistor is disposed in that well. Optionally, one only of the source or drain regions of the low voltage DMOS transistor is disposed in the well. Also, optionally, a region of second conductivity type opposite to the first conductivity type can be provided between the back gate region and the drain region which is less highly doped than the drain region.

    摘要翻译: 一种制造包含HVDMOS晶体管和LVDMOS晶体管的半导体器件的方法,该器件包括提供第一导电类型的半导体材料的区域并形成设置在该区域中的高电压DMOS晶体管。 相对低压的DMOS晶体管也设置在该区域中,并与高电压DMOS晶体管电隔离。 低电压DMOS晶体管具有设置在半导体材料区域中的间隔开的源极和漏极区域以及设置在源极和漏极区域之间的半导体材料区域中的第一导电类型的背栅极区域。 背栅区电耦合到半导体材料的区域。 半导体材料的区域包括延伸到该表面的表面,源极,漏极和后栅极区域。 在半导体材料的区域中提供与第一导电类型相反的第二导电类型的阱,并且在该阱中设置高电压DMOS晶体管。 可选地,低压DMOS晶体管的源极或漏极区域中的仅一个设置在阱中。 此外,可选地,在背栅极区域和漏极区域之间可以提供与第一导电类型相反的第二导电类型的区域,该漏极区域和漏极区域的掺杂度比漏极区域低。

    Method for making an EEPROM with thermal oxide isolated floating gate
    6.
    发明授权
    Method for making an EEPROM with thermal oxide isolated floating gate 失效
    制造具有热氧化隔离浮栅的EEPROM的方法

    公开(公告)号:US5576233A

    公开(公告)日:1996-11-19

    申请号:US493377

    申请日:1995-06-21

    IPC分类号: H01L21/8247

    CPC分类号: H01L27/11521 H01L27/11524

    摘要: A method for making an EEPROM (10) in a semiconductor substrate (40) and EEPROM made according to the method includes forming a gate dielectric (38), such as oxide, nitride, multilayer dielectric, or the like, on a surface of the substrate (40) and forming a polysilicon floating gate (19) on the gate dielectric (38). A control gate (25) is formed at least partially overlying the floating gate (19), and a thermal oxide layer (56) is formed on the floating gate (19) in regions that are not covered by the control gate. Thus, the thermal oxide layer (56) encases any regions of the floating gate (19) uncovered by the control gate (25) and serves as a high quality dielectric to isolate the floating gate (19) from charge loss and other deleterious effects. Then, source and drain regions (21,27) are formed in the substrate (40).

    摘要翻译: 在半导体衬底(40)中制造EEPROM(10)的方法和根据该方法制造的EEPROM包括在该表面上形成诸如氧化物,氮化物,多层电介质等的栅极电介质(38) 衬底(40)并且在栅极电介质(38)上形成多晶硅浮栅(19)。 至少部分地覆盖浮置栅极(19)形成控制栅极(25),并且在未被控制栅极覆盖的区域中的浮动栅极(19)上形成热氧化物层(56)。 因此,热氧化物层(56)包围由控制栅极(25)未覆盖的浮动栅极(19)的任何区域,并且用作高质量电介质以将浮动栅极(19)与电荷损失和其它有害影响隔离开来。 然后,在衬底(40)中形成源区和漏区(21,27)。

    Method of fabricating semiconductor device having polysilicon resistor
with low temperature coefficient
    7.
    发明授权
    Method of fabricating semiconductor device having polysilicon resistor with low temperature coefficient 失效
    制造具有低温系数的多晶硅电阻器的半导体器件的方法

    公开(公告)号:US5489547A

    公开(公告)日:1996-02-06

    申请号:US247443

    申请日:1994-05-23

    摘要: A semiconductor device having a p type polysilicon resistor (56) with a moderate sheet resistance and low temperature coefficient of resistance is formed by a double-level polysilicon process. The process also produces n and p-channel transistors (44, 50), a capacitor having upper and lower n type polysilicon capacitor plates (36, 26), an n type polysilicon resistor (32) having a high sheet resistance, and an n type resistor (34) having a low sheet resistance. The p type doping used to form the source/drain regions (48) of p-channel transistor (50) counterdopes n type second level polysilicon to form p type polysilicon resistor (56) without effecting capacitor plates (36, 26) or the n type resistors (32, 34).

    摘要翻译: 具有中等薄层电阻和低电阻温度系数的p型多晶硅电阻器(56)的半导体器件通过双级多晶硅工艺形成。 该工艺还产生n沟道晶体管和p沟道晶体管(44,50),具有上和下n型多晶硅电容器板(36,26)的电容器,具有高薄层电阻的n型多晶硅电阻器(32)和n 型电阻器(34)。 用于形成p沟道晶体管(50)的源极/漏极区域(48)的p型掺杂反向型n型第二级多晶硅以形成p型多晶硅电阻器(56)而不影响电容器板(36,26)或n 型电阻器(32,34)。

    Self aligned DMOS transistor and method of fabrication
    9.
    发明授权
    Self aligned DMOS transistor and method of fabrication 失效
    自对准DMOS晶体管及其制造方法

    公开(公告)号:US6025231A

    公开(公告)日:2000-02-15

    申请号:US25678

    申请日:1998-02-18

    摘要: A method for fabricating a self-aligned DMOS transistor is provided. The method includes forming a passivation layer (18, 68) on an oxide layer (16, 66) of a substrate (12, 56). The oxide layer (16, 66) is then removed from the surface of the substrate (12, 56) where it is exposed through the passivation layer (18, 68). A reduced surface field region (36, 74) is then formed where the surface of the substrate (12, 56) is exposed through the passivation layer (18, 68). An oxide layer (38, 80) is then formed on the reduced surface field region (36, 74).

    摘要翻译: 提供一种制造自对准DMOS晶体管的方法。 该方法包括在衬底(12,56)的氧化物层(16,66)上形成钝化层(18,68)。 然后从衬底(12,56)的表面去除氧化物层(16,66),在衬底的表面上暴露于钝化层(18,68)。 然后形成还原表面场区(36,74),其中衬底(12,56)的表面通过钝化层(18,68)暴露。 然后在还原表面场区域(36,74)上形成氧化物层(38,80)。

    Semiconductor device having polysilicon resistor with low temperature
coefficient
    10.
    发明授权
    Semiconductor device having polysilicon resistor with low temperature coefficient 失效
    具有低温系数的多晶硅电阻器的半导体装置

    公开(公告)号:US5554873A

    公开(公告)日:1996-09-10

    申请号:US475116

    申请日:1995-06-07

    摘要: A semiconductor device having a p type polysilicon resistor (56) with a moderate sheet resistance and low temperature coefficient of resistance is formed by a double-level polysilicon process. The process also produces n and p-channel transistors (44, 50), a capacitor having upper and lower n type polysilicon capacitor plates (36, 26), an n type polysilicon resistor (32) having a high sheet resistance, and an n type resistor (34) having a low sheet resistance. The p type doping used to form the source/drain regions (48) of p-channel transistor (50) counterdopes n type second level polysilicon to form p type polysilicon resistor (56) without effecting capacitor plates (36, 26) or the n type resistors (32, 34).

    摘要翻译: 具有中等薄层电阻和低电阻温度系数的p型多晶硅电阻器(56)的半导体器件通过双级多晶硅工艺形成。 该工艺还产生n沟道晶体管和p沟道晶体管(44,50),具有上和下n型多晶硅电容器板(36,26)的电容器,具有高薄层电阻的n型多晶硅电阻器(32)和n 型电阻器(34)。 用于形成p沟道晶体管(50)的源极/漏极区域(48)的p型掺杂反向型n型第二级多晶硅以形成p型多晶硅电阻器(56)而不影响电容器板(36,26)或n 型电阻器(32,34)。