Abstract:
A system and method for forming a novel C4 solder bump for BLM (Ball Limiting Metallurgy) includes a novel damascene technique is implemented to eliminate the Cu undercut problem and improve the C4 pitch. In the process, a barrier layer metal stack is deposited above a metal pad layer. A top layer of the barrier layer metals (e.g., Cu) is patterned by CMP. Only bottom layers of the barrier metal stack are patterned by a wet etching. The wet etch time for the Cu-based metals is greatly reduced resulting in a reduced undercut. This allows the pitch of the C4 solder bumps to be reduced. An alternate method includes use of multiple vias at the solder bump terminal.
Abstract:
An electrical interconnection structure and method for forming. The electrical structure comprises a substrate comprising electrically conductive pads and a first dielectric layer over the substrate and the electrically conductive pads. The first dielectric layer comprises vias. A metallic layer is formed over the first dielectric layer and within the vias. A second dielectric layer is formed over the metallic layer. A ball limiting metallization layer is formed within the vias. A photoresist layer is formed over a surface of the ball limiting metallization layer. A first solder ball is formed within a first opening in the photoresist layer and a second solder ball is formed within a second opening in the photoresist layer.
Abstract:
A structure and a method for operating the same. The method comprises providing a resistive/reflective region on a substrate, wherein the resistive/reflective region comprises a material having a characteristic of changing the material's reflectance due to the material absorbing heat; sending an electric current through the resistive/reflective region so as to cause a reflectance change in the resistive/reflective region from a first reflectance value to a second reflectance value different from the first reflectance value; and optically reading the reflectance change in the resistive/reflective region.
Abstract:
A semiconductor structure and method for chip dicing. The method includes (a) providing a semiconductor substrate and (b) forming first and second device regions in and at top of the substrate. The first and second device regions are separated by a semiconductor border region of the substrate. The method further includes (c) forming N interconnect layers, in turn, directly above the semiconductor border region and the first and second device regions. N is a positive integer greater than one. Each of the N interconnect layers includes an etchable portion directly above the semiconductor border region. The etchable portions of the N interconnect layers form a continuous etchable block directly above the semiconductor border region. The method further includes (d) removing the continuous etchable block by etching, and (e) cutting with a laser through the semiconductor border region via an empty space of the removed continuous etchable block.
Abstract:
A method and apparatus for determining the complete coverage of a passivating material on the final conductive interconnection of a wafer containing integrated circuits. A test structure with the dimensions of the final interconnections of the integrated circuits is formed during manufacture of the integrated circuits and used to determine complete coverage of the wafer by creating an opening in the passivating material at the test structure, the size of the opening being indicative of the complete coverage of the wafer.
Abstract:
A solder bump structure and method for forming the same. The structure includes (a) a dielectric layer including a dielectric layer top surface (b) an electrically conducting bond pad on and in direct physical contact with the dielectric layer top surface; (c) a patterned support/interface layer on the dielectric layer top surface and thicker than the electrically conducting bond pad in the reference direction, wherein the patterned support/interface layer comprises a hole and a trench, wherein the hole is directly above the electrically conducting bond pad, and wherein the trench is not filled by any electrically conducting material; and (d) an electrically conducting solder bump filling the hole and electrically coupled to the electrically conducting bond pad.
Abstract:
An integrated circuit has a wiring layer below an insulator layer. A pad comprises a conductive material that is on the insulator layer. The pad has a wirebond connection region and a probe pad region. An inspection mark is between the wirebond connection region and the probe pad region. The inspection mark comprises an opening in the insulator layer that is filled with the conductive material. In addition, a contact that is through the insulator layer is adapted to electrically connect the conductor wire in the wiring layer to the pad. The contact is formed of the same conductive material used for the pad and the inspection mark.