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    • 8. 发明公开
    • Semiconductor device and method of fabricating the same
    • Halbleiterbauelement和dessen Herstellungsverfahren
    • EP2267767A3
    • 2013-12-25
    • EP10187862.7
    • 2003-08-22
    • Fujitsu Microelectronics Limited
    • Saito, Hitoshi
    • H01L21/8239H01L27/105H01L21/762H01L27/115
    • H01L21/76229H01L27/105H01L27/11526H01L27/11543H01L27/11546
    • A pad oxide film and a silicon nitride film are formed on a semiconductor substrate. Next, after the patterning of the silicon nitride film, by etching the pad oxide film and the substrate, a first trench is formed in a first region and a second trench is formed in a second region. After that, by performing side etching of the pad oxide film of the first region while protecting the second region with a resist, a gap is formed between the substrate and the silicon nitride film. Subsequently, the inner surfaces of the first and second trenches are oxidized. At this time, a relatively large volume of oxidizing agent (oxygen) is supplied to a top edge portion of the first trench, and the curvature of the corner of the substrate increases.
    • 在半导体衬底(10)上形成衬垫氧化膜(11)和氮化硅膜(12)。 接下来,在氮化硅膜(12)的图案化之后,通过蚀刻衬垫氧化膜(11)和衬底(10),在第一区域中形成第一沟槽(13a),并且第二沟槽(13b) 形成于第二区域。 之后,通过对第一区域的衬垫氧化膜(11)进行侧蚀刻,同时用抗蚀剂保护第二区域,在衬底(10)和氮化硅膜(12)之间形成间隙。 随后,第一和第二沟槽(13a,13b)的内表面被氧化。 此时,将较大体积的氧化剂(氧)供给到第一沟槽(13a)的顶部边缘部分,并且衬底(10)的角部的曲率增加。