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    • 42. 发明授权
    • Method of forming isolation trenches in a semiconductor device
    • 在半导体器件中形成隔离沟槽的方法
    • US06372606B1
    • 2002-04-16
    • US09368426
    • 1999-08-05
    • Yong-Chul Oh
    • Yong-Chul Oh
    • H01L2176
    • H01L21/76232
    • A method of forming an isolation trench in a semiconductor substrate includes the steps of sequentially depositing first and second insulating layers over the substrate, subsequently etching the second and first insulating layers to define active and non-active regions according to a patterned masking photoresist layer, excessively etching a part of the thickness of the substrate, removing parts of the first insulating layer by undercutting the sides of the non-active region so as to expose parts of the substrate in the active region, etching the substrate by using the second insulating layer as a trench patterned masking layer to form a trench in which the edges of the exposed parts of the substrate are rounded, depositing a third insulating layer on the bottom and side walls of the trench and the rounded parts of the substrate to repair the parts of the substrate damaged when forming the trench, depositing a fourth insulating layer over the second insulating layer so as to completely fill the trench, etching the fourth and second insulating layers plane until a part of the thickness of the second insulating layer is exposed so as to generate the trench isolation region, and sequentially removing the second and first insulating layers along the sides of the isolation trench.
    • 在半导体衬底中形成隔离沟槽的方法包括以下步骤:在衬底上依次沉积第一和第二绝缘层,随后蚀刻第二和第一绝缘层以根据图案化掩模光致抗蚀剂层限定有源和非有源区, 过度蚀刻基板的一部分厚度,通过对非有源区的侧面进行底切而去除部分第一绝缘层,以便使有源区中的基板部分露出,通过使用第二绝缘层蚀刻基板 作为沟槽图案化掩模层以形成沟槽,其中衬底的暴露部分的边缘是圆形的,在沟槽的底部和侧壁以及衬底的圆形部分上沉积第三绝缘层以修复 衬底在形成沟槽时损坏,在第二绝缘层上沉积第四绝缘层以完全地形成 填充沟槽,蚀刻第四绝缘层和第二绝缘层平面,直到露出第二绝缘层的厚度的一部分,以便产生沟槽隔离区域,并且沿隔离沟槽的侧面依次移除第二绝缘层和第一绝缘层 。