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    • 3. 发明授权
    • Alignment system for particle beam lithography
    • 粒子束光刻对准系统
    • US4370554A
    • 1983-01-25
    • US183118
    • 1980-09-02
    • Harald BohlenJohann GreschnerWerner KulckePeter Nehmiz
    • Harald BohlenJohann GreschnerWerner KulckePeter Nehmiz
    • H01J37/304H01L21/68G01N23/00
    • H01J37/3174B82Y10/00B82Y40/00H01J37/3045H01L21/682
    • The mutual alignment of mask and substrate patterns of a specific semiconductor structure are attained by use of a plurality of individual marks in a specific geometric position with respect to each other. By the arrangement of openings in the alignment pattern of the mask, the broad electron beam is split into a multitude of individual beams which interact with alignment marks on the substrate. The interaction is used to generate a coincidence signal. The signal to noise ratio of this arrangement is determined by the overall current and is comparable to that of a thin concentrated electron beam. Registration is effected in a small amount of time and the disadvantageous effects of the high current density used in the raster process are not a factor. In a preferred embodiment, the alignment pattern of the mask is a matrix with center spacings of openings increasing upon advance in two directions perpendicular to each other such that no distance can be represented by the sum of smaller distances. Alignment signals are provided by detecting either absorbed or reflected electrons. A plurality of detectors in the mask are used to detect the reflected electrons.
    • 通过使用相对于彼此的特定几何位置中的多个单独的标记来获得特定半导体结构的掩模和衬底图案的相互对准。 通过在掩模的对准图案中布置开口,宽电子束被分成与基板上的对准标记相互作用的多个单独的光束。 该交互用于产生符合信号。 该布置的信噪比由总电流确定,并且与薄的集中电子束的信噪比相当。 注册在少量时间内进行,并且在光栅处理中使用的高电流密度的不利影响不是因素。 在优选实施例中,掩模的对准图案是矩阵,其中开口的中心间隔在彼此垂直的两个方向上预先增加,使得距离可以由较小距离的和表示。 通过检测吸收或反射的电子来提供对准信号。 掩模中的多个检测器用于检测反射的电子。
    • 8. 发明授权
    • Method of transferring a pattern into a radiation-sensitive layer
    • 将图案转印到辐射敏感层中的方法
    • US4591540A
    • 1986-05-27
    • US603020
    • 1984-04-23
    • Harald BohlenErwin BretscherHelmut EngelkePeter NehmizPeter VettigerJohann Greschner
    • Harald BohlenErwin BretscherHelmut EngelkePeter NehmizPeter VettigerJohann Greschner
    • H01L21/30G03F1/20G03F1/68G03F7/20H01L21/027G03F9/00G03C5/00
    • G03F1/20G03F1/68G03F7/70475
    • According to this process two partial patterns which, if superimposed upon each other in a predetermined alignment relative to each other yield the desired pattern, with elements of both partial patterns combining to form elements of the pattern, and these partial pattern elements overlapping sectionally, are projected with a suitable radiation onto the radiation-sensitive layers. Overlapping is achieved in that when designing the two partial patterns a pattern corresponding to the desired pattern is used as a basis in that the elements of this pattern are exposed to a negative windage, the negative windage pattern is subsequently partitioned into two negative windage patterns corresponding to the partial patterns, and finally the negative windage partial pattern elements are exposed to a positive windage to the desired size of the partial pattern elements.The method is used in particular when a pattern is to be transferred by means of hole masks, and if it is necessary, e.g. because the pattern shows annular elements, to use instead of one mask only two complementary masks each comprising at least one part of the pattern.
    • 根据该处理,如果相互相对于彼此以预定的对准彼此重叠的两个部分图案产生期望的图案,则两个部分图案的元素组合以形成图案的元件,并且这些部分图案元素分别重叠 以合适的辐射投射到辐射敏感层上。 实现重叠是因为当设计两个部分图案时,将与期望图​​案相对应的图案用作基础,因为该图案的元件暴露于负风挡,然后将负风挡图案划分为相应的两个负风挡图案 对于部分图案,最后,负风挡部分图案元件暴露于部分图案元件的期望尺寸的正向风挡。 特别是当通过孔掩模传输图案时,特别是使用该方法。 因为图案示出了环形元件,而是使用仅包括两个互补掩模的两个互补掩模,每个掩模包括图案的至少一部分。
    • 9. 发明授权
    • Method of compensating the proximity effect in electron beam projection
systems
    • 补偿电子束投影系统中邻近效应的方法
    • US4504558A
    • 1985-03-12
    • US541741
    • 1983-10-13
    • Harald BohlenHelmut EngelkeJohann GreschnerPeter Nehmiz
    • Harald BohlenHelmut EngelkeJohann GreschnerPeter Nehmiz
    • G03F7/20H01J37/317G03C5/00
    • B82Y10/00B82Y40/00G03F7/20H01J37/3174H01J2237/31769
    • For compensating scattering losses of electrons in photoresists (proximity effect) which influence electron beam lithography by altering the pattern geometry it is suggested to expose selected partial areas of a pattern to an additional irradiation dosage in a second exposure step. For that purpose, a specific mask with corresponding correction openings can be used which is applied with the same, or with a different electron beam intensity. In a particularly advantageous manner the correction of the proximity effect can be achieved when complementary masks are used; the correction openings for the partial areas of the one complementary mask are arranged in the other complementary mask. The proximity effect is then corrected without an additional exposure step. For measuring the proximity effect a photo-optical process is suggested where line patterns with decreasing ridge width in the photoresist are defined through electron beam projection, and where the developing process of the photoresist is discontinued prematurely. The ridge edges which in the presence of the proximity effect are asymmetrical can be easily detected under the microscope.
    • 为了补偿通过改变图案几何影响电子束光刻的光致抗蚀剂(邻近效应)中的电子的散射损失,建议在第二曝光步骤中将图案的所选部分区域暴露于另外的照射剂量。 为此,可以使用具有相应校正开口的特定掩模,其应用相同或具有不同的电子束强度。 在特别有利的方式中,当使用互补掩模时可以实现邻近效应的校正; 一个互补掩模的部分区域的校正开口布置在另一个互补掩模中。 然后在没有额外的曝光步骤的情况下校正邻近效果。 为了测量接近效应,建议在光致抗蚀剂中具有减小的脊宽​​度的线图案通过电子束投影来限定光致抗蚀剂的显影过程以及光致抗蚀剂的显影过程过早地停止的情况。 在接近效应的存在下的脊边缘是不对称的,可以在显微镜下容易地检测。
    • 10. 发明授权
    • Shadow projection mask for ion implantation and ion beam lithography
    • 用于离子注入和离子束光刻的阴影投影掩模
    • US4448865A
    • 1984-05-15
    • US434074
    • 1982-10-12
    • Harald BohlenJohann GreschnerPeter Nehmiz
    • Harald BohlenJohann GreschnerPeter Nehmiz
    • H01L21/027G03F1/20H01L21/266G03F9/00
    • G03F1/20H01L21/266
    • A projection mask comprises a thin P.sup.+ -doped silicon layer with through holes adapted to the mask pattern, a grid supporting this layer having silicon ribs. On at least on its side facing away from the grid, the layer has a layer, which is at least as thick as to prevent the implanting of ions in the silicon layer. At least the mask surface exposed to ion irradiation is electrically and thermally conductive, and mechanically resistant. The coating of the silicon frame of the mask is such that it does not cause any mask deformation caused by temperature and/or through inherent tensions of the coating. Preferred absorbing materials are gold, silver, platinum, tungsten, and tantalum, and mechanically resistant materials are preferably carbon, molybdenum, titanium, tungsten, and tantalum. In operation, the mask with grid is placed onto the substrate to be irradiated, and subsequently blanket-illuminated with an ion beam, or scanned line-by-line until each point on the mask has been covered by the beam path.
    • 投影掩模包括具有适于掩模图案的通孔的薄P +掺杂硅层,支撑具有硅肋的层的栅格。 至少在其背离格栅的一侧上,该层具有至少与防止在硅层中注入离子一样厚的层。 至少暴露于离子照射的掩模表面是导电和导热的,并且机械地耐受。 掩模的硅框架的涂层使得其不会引起由温度和/或通过涂层的固有张力引起的任何掩模变形。 优选的吸收材料是金,银,铂,钨和钽,并且机械抵抗材料优选为碳,钼,钛,钨和钽。 在操作中,将具有栅格的掩模放置在要照射的基板上,然后用离子束进行毯式照明,或者逐行扫描,直到掩模上的每个点已被光束路径覆盖。