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    • 4. 发明公开
    • 반도체 장치의 제조 방법
    • 制造半导体器件的方法
    • KR1020000004879A
    • 2000-01-25
    • KR1019980056932
    • 1998-12-21
    • 미쓰비시덴키 가부시키가이샤
    • 사까이마이꼬구로이다까시호리따가쯔유끼
    • H01L21/76
    • H01L21/31053H01L21/76224Y10S438/97
    • PURPOSE: A fabrication method of semiconductor devices having trench isolation structure is provided to prevent a damage of substrate and a depression of the trench isolation by controlling etching selectivity adequately. CONSTITUTION: The method comprises the steps of forming a trench(21) in a silicon substrate(1) having a lower oxide(2) and a silicon nitride(3); filling a silicon oxide(11) into the trench(21) by HDP(high density plasma) CVD method; forming a first resist pattern(41) having a resist part(42) and a second resist pattern(43); removing the exposed silicon oxide(11) by dry etching used the resist patterns(41,43), wherein the etching selectivity of the silicon oxide(11) against to the nitride layer(3) used as a stopping layer is 2(c-a)/d more than, where a is alignment margin, c is maximum value of thickness of the silicon oxide(11) and d is thickness of the stopping layer(3) made of silicon nitride; removing the resist patterns(41,43); and removing the remained silicon oxide layers(11B,11DC,11DE,11FE) using CMP. Thereby, it is possible to easily form the trench isolation structure being not has a depression at edge portion of the trench.
    • 目的:提供具有沟槽隔离结构的半导体器件的制造方法,以通过适当地控制蚀刻选择来防止衬底损坏和凹槽隔离。 构成:该方法包括在具有低氧化物(2)和氮化硅(3)的硅衬底(1)中形成沟槽(21)的步骤; 通过HDP(高密度等离子体)CVD法将氧化硅(11)填充到沟槽(21)中; 形成具有抗蚀剂部分(42)和第二抗蚀剂图案(43)的第一抗蚀剂图案(41)。 通过干蚀刻去除暴露的氧化硅(11),使用抗蚀剂图案(41,43),其中氧化硅(11)对作为停止层的氮化物层(3)的蚀刻选择性为2(ca) / d以上,其中a是取向余量,c是氧化硅(11)的厚度的最大值,d是由氮化硅制成的停止层(3)的厚度; 去除抗蚀剂图案(41,43); 并使用CMP除去剩余的氧化硅层(11B,11DC,11DE,11FE)。 由此,可以容易地形成在沟槽的边缘部分没有凹陷的沟槽隔离结构。