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    • 46. 发明授权
    • Method and structure for improved alignment in MRAM integration
    • 改善MRAM集成对齐的方法和结构
    • US07507633B2
    • 2009-03-24
    • US11369516
    • 2006-03-07
    • Sivananda K. KanakasabapathyDavid W. Abraham
    • Sivananda K. KanakasabapathyDavid W. Abraham
    • H01L21/76
    • H01L23/544H01L27/222H01L2223/54453H01L2924/0002Y10S438/975H01L2924/00
    • A method for implementing alignment of a semiconductor device structure includes forming first and second sets of alignment marks within a lower level of the structure, the second set of alignment marks adjacent the first set of alignment marks. An opaque layer is formed over the lower level, including the first and second sets of alignment marks. A portion of the opaque layer corresponding to the location of said first set of alignment marks is opened so as to render the first set optically visible while the second set of alignment marks initially remains covered by the opaque layer. The opaque layer is patterned using the optically visible first set of alignment marks, wherein the second set of alignment marks remain available for subsequent alignment operations in the event the first set becomes damaged during patterning of the opaque layer.
    • 用于实现半导体器件结构的对准的方法包括在该结构的较低级别内形成第一组和第二组对准标记,第二组对准标记与第一组对准标记相邻。 在较低层上形成不透明层,包括第一组和第二组对准标记。 对应于所述第一组对准标记的位置的不透明层的一部分被打开,以使第一组光学可见,而第二组对准标记最初保持被不透明层覆盖。 使用光学可见的第一组对准标记图案化不透明层,其中在第一组在不透明层的图案化期间第一组变得损坏的情况下,第二组对准标记保持可用于随后的对准操作。