Semiconductor device with dual gate oxides
    1.
    发明授权
    Semiconductor device with dual gate oxides 失效
    具有双栅极氧化物的半导体器件

    公开(公告)号:US07259071B2

    公开(公告)日:2007-08-21

    申请号:US10973852

    申请日:2004-10-25

    摘要: A method for making a semiconductor device having a first active region and a second active region includes providing first and second isolation structures defining the first active region on a substrate. The first active region uses a first operational voltage, and the second active region uses a second operational voltage that is different from the first voltage. A nitride layer overlying the first and second active regions is formed. An oxide layer overlying the nitride layer is formed. A first portion of the oxide layer overlying the first active region is removed to expose a first portion of the nitride layer. The exposed first portion of the nitride layer is removed using a wet etch method while leaving a second portion of the nitride layer that is overlying the second active region intact. Thereafter, a first gate oxide having a first thickness is formed on the first active region, the first gate oxide having a first edge facing the first isolation structure and a second edge facing the second isolation structure. The first edge is separated from the first isolation structure by a first distance. The second edge is separated from the second isolation structure by a second distance. Thereafter, a second gate oxide having a second thickness is formed on the second active region, the second thickness being different than the first thickness.

    摘要翻译: 制造具有第一有源区和第二有源区的半导体器件的方法包括提供在衬底上限定第一有源区的第一和第二隔离结构。 第一有源区域使用第一工作电压,而第二有源区域使用不同于第一电压的第二工作电压。 形成覆盖第一和第二有源区的氮化物层。 形成覆盖氮化物层的氧化物层。 去除覆盖在第一有源区上的氧化物层的第一部分以露出氮化物层的第一部分。 使用湿蚀刻方法去除氮化物层的暴露的第一部分,同时留下覆盖第二有源区域的氮化物层的第二部分完好无损。 此后,在第一有源区上形成具有第一厚度的第一栅极氧化物,第一栅极氧化物具有面对第一隔离结构的第一边缘和面向第二隔离结构的第二边缘。 第一边缘与第一隔离结构隔开第一距离。 第二边缘与第二隔离结构隔开第二距离。 此后,在第二有源区上形成具有第二厚度的第二栅极氧化物,第二厚度不同于第一厚度。

    Semiconductor device with dual gate oxides
    2.
    发明授权
    Semiconductor device with dual gate oxides 有权
    具有双栅极氧化物的半导体器件

    公开(公告)号:US06818514B2

    公开(公告)日:2004-11-16

    申请号:US10377167

    申请日:2003-02-26

    IPC分类号: H01L218234

    摘要: A method for making a semiconductor device having a first active region and a second active region includes providing first and second isolation structures defining the first active region on a substrate. The first active region uses a first operational voltage, and the second active region uses a second operational voltage that is different from the first voltage. A nitride layer overlying the first and second active regions is formed. An oxide layer overlying the nitride layer is formed. A first portion of the oxide layer overlying the first active region is removed to expose a first portion of the nitride layer. The exposed first portion of the nitride layer is removed using a wet etch method while leaving a second portion of the nitride layer that is overlying the second active region intact. Thereafter, a first gate oxide having a first thickness is formed on the first active region, the first gate oxide having a first edge facing the first isolation structure and a second edge facing the second isolation structure. The first edge is separated from the first isolation structure by a first distance. The second edge is separated from the second isolation structure by a second distance. Thereafter, a second gate oxide having a second thickness is formed on the second active region, the second thickness being different than the first thickness.

    摘要翻译: 制造具有第一有源区和第二有源区的半导体器件的方法包括提供在衬底上限定第一有源区的第一和第二隔离结构。 第一有源区域使用第一工作电压,而第二有源区域使用不同于第一电压的第二工作电压。 形成覆盖第一和第二有源区的氮化物层。 形成覆盖氮化物层的氧化物层。 去除覆盖在第一有源区上的氧化物层的第一部分以露出氮化物层的第一部分。 使用湿蚀刻方法去除氮化物层的暴露的第一部分,同时留下覆盖第二有源区域的氮化物层的第二部分完好无损。 此后,在第一有源区上形成具有第一厚度的第一栅极氧化物,第一栅极氧化物具有面对第一隔离结构的第一边缘和面向第二隔离结构的第二边缘。 第一边缘与第一隔离结构隔开第一距离。 第二边缘与第二隔离结构隔开第二距离。 此后,在第二有源区上形成具有第二厚度的第二栅极氧化物,第二厚度不同于第一厚度。

    Method to form non-volatile memory cells
    4.
    发明授权
    Method to form non-volatile memory cells 有权
    形成非易失性记忆体的方法

    公开(公告)号:US06362045B1

    公开(公告)日:2002-03-26

    申请号:US09567419

    申请日:2000-05-09

    IPC分类号: H01L21336

    摘要: A new method of forming non-volatile memory cells with an improved bottom silicon dioxide layer of the O—N—O has been achieved. A semiconductor substrate is provided. A tunneling dielectric layer is grown overlying the semiconductor substrate. A polysilicon layer is deposited overlying the tunneling dielectric layer. Nitrogen is implanted into the polysilicon layer to form a nitridized surface region. The polysilicon layer and the tunneling dielectric layer are then patterned to form floating gates. A bottom silicon dioxide layer is grown overlying the floating gates by thermal oxidation of the polysilicon layer. The nitridized surface region reduces the rate of thermal oxidation and creates a smooth surface. A silicon nitride layer is deposited overlying the bottom silicon dioxide layer. A top silicon dioxide layer is formed overlying the silicon nitride layer to complete the O—N—O stack. A conductive layer, that may comprise polysilicon, is deposited overlying the top silicon dioxide layer. The conductive layer, the top silicon dioxide layer, the silicon nitride layer, and the bottom silicon dioxide layer are patterned to form control gates and to complete the non-volatile memory cells.

    摘要翻译: 已经实现了用O-N-O改进的底部二氧化硅层形成非易失性存储单元的新方法。 提供半导体衬底。 生长在半导体衬底上的隧道介电层。 沉积覆盖隧道介电层的多晶硅层。 将氮注入到多晶硅层中以形成氮化表面区域。 然后将多晶硅层和隧道介电层图案化以形成浮栅。 通过多晶硅层的热氧化生长覆盖浮栅的底部二氧化硅层。 氮化表面区域降低热氧化速率并产生光滑表面。 沉积在底部二氧化硅层上的氮化硅层。 形成覆盖氮化硅层的顶部二氧化硅层以完成O-N-O堆叠。 可以包括多晶硅的导电层覆盖在顶部二氧化硅层上。 将导电层,顶部二氧化硅层,氮化硅层和底部二氧化硅层图案化以形成控制栅极并完成非易失性存储单元。