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    • 10. 发明授权
    • Semiconductor including STI and method for manufacturing the same
    • 包括STI的半导体及其制造方法
    • US07759214B2
    • 2010-07-20
    • US11505727
    • 2006-08-17
    • Suh Byoung Yoon
    • Suh Byoung Yoon
    • H01L21/02
    • H01L21/76232H01L21/76235
    • Provided is a semiconductor device and method of making, incorporating a trench having rounded edges. According to an embodiment, a pad oxide layer, nitride layer, and TEOS layer are sequentially formed on a substrate. The TEOS layer, nitride layer, and pad oxide layer are dry-etched using a photosensitive layer pattern as a mask. After removing the photosensitive layer pattern, a trench is formed by dry-etching the substrate using the etched TEOS layer, nitride layer, and pad oxide layer as a mask. A portion of the pad oxide layer is pullback-etched, resulting in a first rounding of the trench. A portion of the etched nitride layer is pullback-etched and a portion of the etched TEOS layer is pullback-etched. The upper corner of the trench of the substrate is dry-etched using the pullback-etched TEOS layer, nitride layer, and pad oxide layer as a mask, resulting in a second rounding of the trench.
    • 提供了一种半导体器件和制造方法,结合具有圆形边缘的沟槽。 根据实施例,衬底氧化物层,氮化物层和TEOS层依次形成在衬底上。 使用感光层图案作为掩模来干蚀刻TEOS层,氮化物层和焊盘氧化物层。 在去除感光层图案之后,通过使用蚀刻的TEOS层,氮化物层和焊盘氧化物层作为掩模对基板进行干蚀刻来形成沟槽。 衬垫氧化物层的一部分被回拉蚀刻,导致沟槽的第一舍入。 蚀刻的氮化物层的一部分被回拉蚀刻,并且蚀刻的TEOS层的一部分被回拉刻蚀。 使用回拉蚀刻的TEOS层,氮化物层和衬垫氧化物层作为掩模来干蚀刻衬底的沟槽的上角,导致沟槽的第二个圆化。