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    • 5. 发明授权
    • Field effect transistor without spacer mask edge defects
    • 场效应晶体管,无间隔掩模边缘缺陷
    • US5482876A
    • 1996-01-09
    • US450266
    • 1995-05-25
    • Yong-Fen HsiehShu-Ying LuWen-Ching Tsai
    • Yong-Fen HsiehShu-Ying LuWen-Ching Tsai
    • H01L21/265H01L21/266H01L21/3105H01L21/336
    • H01L29/66598H01L21/2652H01L21/266H01L21/3105H01L29/66575Y10S438/965
    • A field effect transistor which is not susceptible to mask edge defects at its gate spacer oxides. The transistor is formed upon a (100) silicon semiconductor substrate through successive layering of a gate oxide, and a gate electrode. A pair of gate spacer oxides is then formed covering opposite edges of the gate oxide and the gate electrode. A screen oxide is then formed over the surface of the semiconductor substrate, the gate and the gate spacer oxides. The upper surface of the screen oxide has an angle of elevation not exceeding 54.44 degrees with respect to the semiconductor substrate. The screen oxide also smoothly flows from thicker regions at the junctures of the gate spacer oxides and the semiconductor substrate to thinner regions over the surface of the semiconductor substrate. The semiconductor substrate adjoining the gate spacer oxides is then ion implanted through the screen oxide to form amorphous source/drain electrodes. The penetration depth of the ion implant is greater than the thickness of the thinner regions of the screen oxide and no greater than the thickness of the thicker regions of the screen oxide. Finally, the amorphous source/drain electrodes are annealed. In a second embodiment, a dopes glass screen layer is used in place of the screen oxide layer. The glass layer must be removed prior to annealing the amorphous source/drain electrodes.
    • 场效应晶体管,其栅极间隔氧化物不易受掩模边缘缺陷的影响。 晶体管通过栅极氧化物和栅极电极的连续分层形成在(100)硅半导体衬底上。 然后形成一对栅极间隔氧化物,覆盖栅极氧化物和栅电极的相对边缘。 然后在半导体衬底,栅极和栅极间隔物氧化物的表面上形成屏幕氧化物。 屏幕氧化物的上表面相对于半导体衬底具有不超过54.44度的仰角。 屏蔽氧化物也从栅极间隔物氧化物和半导体衬底的接合处的较厚区域平滑地流过半导体衬底的表面上较薄的区域。 然后,与栅极间隔物氧化物相邻的半导体衬底通过荧光体氧化物离子注入,以形成无定形源/漏电极。 离子注入的穿透深度大于屏幕氧化物的较薄区域的厚度,并且不大于屏幕氧化物较厚区域的厚度。 最后,对非晶态/漏极进行退火。 在第二实施例中,使用掺杂玻璃屏幕层代替屏幕氧化物层。 必须在退火非晶态/漏极之前去除玻璃层。