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    • 41. 发明申请
    • Method for bonding wafers to produce stacked integrated circuits
    • 用于接合晶片以产生堆叠集成电路的方法
    • US20020163072A1
    • 2002-11-07
    • US09847667
    • 2001-05-01
    • Subhash GuptaPaul Kwok Keung HoSangki Hong
    • H01L021/461H01L023/12H01L023/544
    • H01L21/76898H01L23/481H01L24/08H01L24/80H01L25/0657H01L25/50H01L2224/08148H01L2224/80203H01L2224/8083H01L2224/80895H01L2225/06513H01L2225/06541H01L2924/14H01L2924/351H01L2924/00
    • An integrated circuit wafer element and an improved method for bonding the same to produce a stacked integrated circuit. An integrated circuit wafer according to the present invention includes a substrate having first and second surfaces constructed from a wafer material, the first surface having a circuit layer that includes integrated circuit elements constructed thereon. A plurality of vias extend from the first surface through the circuit layer and terminate in the substrate at a first distance from the first surface. The vias include a stop layer located in the bottom of each via constructed from a stop material that is more resistant to chemical/mechanical polishing (CMP) than the wafer material. The vias may be filled with an electrically conducting material to provide vertical connections between the various circuit layers in a stacked integrated circuit. In this case, the electrical conducting vias are also connected to various circuit elements by metallic conductors disposed in a dielectric layer that covers the circuit layer. A plurality of bonding pads are provided on one surface of the integrated circuit wafer. These pads may be part of the vias. These pads preferably extend above the surface of the integrated circuit wafer. A stacked integrated circuit according to the present invention is constructed by bonding two integrated circuit wafers together utilizing the bonding pads. One of the integrated circuit wafers is then thinned to a predetermined thickness determined by the depth of the vias by chemical/mechanical polishing (CMP) of the surface of that integrated circuit wafer that is not bonded to the other integrated circuit wafer, the stop layer in the vias preventing the CMP from removing wafer material that is within the first distance from the first surface of the substrate of the wafer being thinned.
    • 一种集成电路晶片元件和用于将其结合以产生堆叠集成电路的改进方法。 根据本发明的集成电路晶片包括具有由晶片材料构成的第一和第二表面的基板,所述第一表面具有包括在其上构成的集成电路元件的电路层。 多个通孔从第一表面延伸穿过电路层,并在离开第一表面的第一距离处终止在基板中。 通孔包括位于每个通孔底部的停止层,该停止层由比晶片材料更耐化学/机械抛光(CMP)的止动材料构成。 通孔可以填充有导电材料,以在堆叠集成电路中的各个电路层之间提供垂直连接。 在这种情况下,导电通孔也通过布置在覆盖电路层的电介质层中的金属导体连接到各种电路元件。 多个接合焊盘设置在集成电路晶片的一个表面上。 这些焊盘可以是通孔的一部分。 这些焊盘优选地在集成电路晶片的表面上方延伸。 根据本发明的堆叠集成电路是通过使用接合焊盘将两个集成电路晶片结合在一起而构成的。 然后通过化学/机械抛光(CMP)将集成电路晶片之一变薄到由通孔的深度确定的预定厚度,该集成电路晶片的表面未结合到另一集成电路晶片,停止层 在通孔中,防止CMP从晶片的衬底的第一表面的第一距离内移除晶片材料。