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    • 1. 发明授权
    • Lithographic mask, and method for covering a mask layer
    • 平版印刷掩模和覆盖掩模层的方法
    • US07405024B2
    • 2008-07-29
    • US10952559
    • 2004-09-28
    • Uwe Paul SchroederOliver Broermann
    • Uwe Paul SchroederOliver Broermann
    • G03F1/14
    • G03F1/62G03F1/48
    • A lithographic mask having a mask substrate (3) and a patterned mask layer (4) which includes mask structures (5) and can be transferred by lithography to a further substrate is disclosed. With masks of this type, it is customary for a protective layer to be provided in the form of a membrane positioned at a distance from the mask layer (4), in order to keep impurity particles or other impurities away from the focal plane of the mask layer (4). According to the invention, the protective layer (6) is applied in liquid form directly to the mask structures (5) and fills up spaces between the mask structures (4). Then, the protective layer (6), while it is still in the liquid state, is covered with a plane-parallel plate. The continuously dense protective layer (6) which is formed in accordance with the invention is even more reliable in preventing impurity particles or impurities (20) from penetrating into spacers between the structures (5) of the mask layer (4). The impurity particles or impurities (20) can only be deposited on the outer side (16) of the protective layer (6), at a still greater distance from the focal plane.
    • 公开了一种具有掩模衬底(3)和包括掩模结构(5)的图案化掩模层(4)并且可以通过光刻转移到另一衬底的光刻掩模。 对于这种类型的掩模,通常保护层以与掩模层(4)相距一定距离的膜的形式提供,以便使杂质颗粒或其它杂质远离所述掩模层(4)的焦平面 掩模层(4)。 根据本发明,保护层(6)以液体形式直接施加到掩模结构(5)并填充掩模结构(4)之间的空间。 然后,保护层(6)仍处于液体状态时被平面平行板覆盖。 根据本发明形成的连续致密保护层(6)在防止杂质颗粒或杂质(20)渗透到掩模层(4)的结构(5)之间的间隔物中是更可靠的。 杂质颗粒或杂质(20)只能在与焦平面更远的距离处沉积在保护层(6)的外侧(16)上。
    • 6. 发明授权
    • Method and apparatus for producing rectangular contact holes utilizing side lobe formation
    • 利用旁瓣形成生产矩形接触孔的方法和装置
    • US07224030B2
    • 2007-05-29
    • US10863786
    • 2004-06-08
    • Uwe Paul Schroeder
    • Uwe Paul Schroeder
    • H01L27/01
    • G03F1/32G03F1/26
    • An array of small square contact holes, on the order of magnitude of the exposing light wavelength, are formed by selecting the partial coherence and numerical aperture of the exposing light source and the pitch of the array of windows on an attenuating phase shifting mask so that side lobes formed by the exposing light being diffracted as it passes through the array of window constructively interfere with one another in the vicinity of a desired contact hole on the material surface. This constructive interference of side lobe patterns, in combination with the pattern formed by the light passing undiffracted through the array of windows, forms an array of square exposed regions on the material surface. When the material is a photoresist, the exposed regions can be selectively dissolved in order to form square patterns that can be used to etch square holes in the underlying substrate or layer. In subsequent steps, selected ones of the array of square holes can be filled in with a conductive material to form vias and selected others of the square holes can be filled in with an insulating material so as to avoid the formation of unintended vias or conducting paths.
    • 通过在衰减的相移掩模上选择曝光光源的部分相干和数值孔径以及窗口阵列的间距,形成曝光光波长数量级的小方形接触孔阵列,使得 当通过窗口阵列时由被衍射的曝光所形成的旁瓣在材料表面上期望的接触孔附近相互干扰。 旁瓣图案的这种结构性干扰与通过未折射通过窗阵列的光形成的图案组合在材料表面上形成方阵曝光区域的阵列。 当材料是光致抗蚀剂时,可以选择性地溶解暴露的区域以形成可用于蚀刻下面的衬底或层中的方形孔的正方形图案。 在随后的步骤中,可以用导电材料填充方孔阵列中的选定的方孔以形成通孔,并且可以用绝缘材料填充所选择的其他方孔,以避免形成非预期的通孔或导电路径 。