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    • 92. 发明授权
    • Shallow trench isolation formation with two source/drain masks and simplified planarization mask
    • 浅沟槽隔离形成,具有两个源/漏屏蔽和简化的平面化掩模
    • US06380047B1
    • 2002-04-30
    • US09634990
    • 2000-08-08
    • Basab BandyopadhyayNick KeplerOlov KarlssonLarry WangEffiong IbokChristopher F. Lyons
    • Basab BandyopadhyayNick KeplerOlov KarlssonLarry WangEffiong IbokChristopher F. Lyons
    • H01L2176
    • H01L21/76229
    • An insulated trench isolation structure with large and small trenches of differing widths is formed in a semiconductor substrate with improved planarity using a simplified reverse source/drain planarization mask. Embodiments include forming large trenches and refilling them with an insulating material which also covers the substrate surface, masking the areas above the large trenches, etching to remove substantially all of the insulating material on the substrate surface and polishing to planarize the insulating material above the large trenches. Small trenches and peripheral trenches surrounding the large trenches are then formed, refilled with insulating material, and planarized. Since the large trenches are formed prior to and separately from the small trenches, etching can be carried out after the formation of a relatively simple planarization mask over only the large trenches, and not the small trenches. The use of a planarization mask with relatively few features having a relatively large geometry avoids the need to create and implement a complex and critical mask, thereby reducing manufacturing costs and increasing production throughput. Furthermore, because the large and small trenches are not polished at the same time, overpolishing is avoided, thereby improving planarity and, hence, the accuracy of subsequent photolithographic processing.
    • 使用简化的反向源极/漏极平面化掩模,在具有改善的平面度的半导体衬底中形成具有不同宽度的大的和小的沟槽的绝缘沟槽隔离结构。 实施例包括形成大沟槽并用也覆盖衬底表面的绝缘材料再填充它们,掩蔽大沟槽上方的区域,蚀刻以基本上除去衬底表面上的所有绝缘材料,并抛光以平坦化绝缘材料 沟渠 然后形成围绕大沟槽的小沟槽和外围沟槽,用绝缘材料重新填充并平坦化。 由于在小沟槽之前和分开形成大沟槽,所以可以在仅在大沟槽上而不是小沟槽形成相对简单的平坦化掩模之后进行蚀刻。 使用具有相对较大几何特征的平面化掩模的使用避免了创建和实现复杂和关键掩模的需要,从而降低制造成本并提高生产量。 此外,因为大的和小的沟槽不同时被抛光,所以避免了过度抛光,从而提高平面度,从而提高随后的光刻处理的精度。
    • 96. 发明授权
    • Shallow trench isolation formation with simplified reverse planarization
mask
    • 浅沟槽隔离形成,具有简化的反向平面化掩模
    • US6124183A
    • 2000-09-26
    • US992490
    • 1997-12-18
    • Olov KarlssonChristopher F. LyonsBasab BandyopadhyayNick KeplerLarry WangEffiong Ibok
    • Olov KarlssonChristopher F. LyonsBasab BandyopadhyayNick KeplerLarry WangEffiong Ibok
    • H01L21/762H01L21/76
    • H01L21/76224
    • An insulated trench isolation structure with large and small trenches of differing widths is formed in a semiconductor substrate using a simplified reverse source/drain planarization mask. Embodiments include forming trenches and refilling them with an insulating material which also covers a main surface of the substrate, polishing to remove an upper portion of the insulating material and to planarize the insulating material above the small trenches, furnace annealing to densify and strengthen the remaining insulating material, masking the insulating material above the large trenches, isotropically etching the insulating material, and polishing to planarize the insulating material. Since the insulating material is partially planarized and strengthened prior to etching, etching can be carried out after the formation of a relatively simple planarization mask over only the large trenches, and not the small trenches. Because the features of the planarization mask are relatively few and have a relatively large geometry, the present invention avoids the need to create and implement a critical mask, enabling production costs to be reduced and manufacturing throughput to be increased.
    • 使用简化的反向源极/漏极平面化掩模在半导体衬底中形成具有不同宽度的大的和小的沟槽的绝缘沟槽隔离结构。 实施例包括形成沟槽并用绝缘材料再填充它们,该绝缘材料也覆盖衬底的主表面,抛光以除去绝缘材料的上部并平面化小沟槽上方的绝缘材料,炉退火致密化并加强其余部分 绝缘材料,掩蔽大沟槽上方的绝缘材料,各向同性地蚀刻绝缘材料,并抛光以使绝缘材料平坦化。 由于在蚀刻之前绝缘材料被部分平坦化和加强,因此可以在仅在大的沟槽上而不是小沟槽形成相对简单的平坦化掩模之后进行蚀刻。 由于平面化掩模的特征相对较少并且具有相对较大的几何形状,因此本发明避免了创建和实施关键掩模的需要,从而能够降低生产成本并提高生产量。