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    • 3. 发明授权
    • Method to form shallow trench isolation structures with improved
isolation fill and surface planarity
    • 形成具有改进的隔离填充和表面平面性的浅沟槽隔离结构的方法
    • US6027982A
    • 2000-02-22
    • US245565
    • 1999-02-05
    • Igor V. PeidousVladislav Y. VassilievChock H. GanGuang Ping Hua
    • Igor V. PeidousVladislav Y. VassilievChock H. GanGuang Ping Hua
    • H01L21/762H01L21/76
    • H01L21/76235Y10S148/05
    • A method to form shallow trench isolation structures with improved isolation fill and surface planarity is described. A pad oxide layer is provided over the surface of a semiconductor substrate. A silicon nitride layer is deposited overlying the pad oxide layer. A thin oxide layer is deposited overlying the silicon nitride layer. An isolation trench is etched through the thin oxide layer, the nitride layer, and the pad oxide layer and into the substrate. The silicon nitride layer exposed within the trench is etched to form a lateral undercut leaving a projection of the thin oxide layer and exposing a portion of the underlying pad oxide layer. The thin oxide layer and the exposed portion of the pad oxide layer are etched away thereby exposing portions of the surface of the substrate. A liner oxide is grown on the exposed portions of the semiconductor substrate within the isolation trench and on the surface of the substrate. A layer of isolation dielectric is deposited overlying the liner oxide and the silicon nitride and filling the isolation trench. The isolation dielectric is polished away stopping at the silicon nitride layer. The remaining silicon nitride etched away. The isolation dielectric and the pad oxide are etched away from the surface of the semiconductor substrate. The fabrication of the integrated circuit device is completed.
    • 描述了形成具有改进的隔离填充和表面平面性的浅沟槽隔离结构的方法。 衬垫氧化物层设置在半导体衬底的表面上。 在衬垫氧化物层上沉积氮化硅层。 沉积在氮化硅层上的薄氧化层。 通过薄氧化物层,氮化物层和焊盘氧化物层蚀刻隔离沟槽并进入衬底。 在沟槽内暴露的氮化硅层被蚀刻以形成横向底切,留下薄的氧化物层的突起,并暴露下面的衬垫氧化物层的一部分。 薄氧化物层和衬垫氧化物层的暴露部分被蚀刻掉,从而暴露衬底表面的部分。 衬垫氧化物生长在半导体衬底在隔离沟槽内和衬底表面上的暴露部分上。 沉积覆盖衬垫氧化物和氮化硅并且填充隔离沟槽的隔离电介质层。 在氮化硅层处停止隔离电介质被抛光。 剩余的氮化硅蚀刻掉。 绝缘电介质和衬垫氧化物被蚀刻离开半导体衬底的表面。 完成集成电路器件的制造。