Abstract:
Structures with improved solder bump connections and methods of fabricating such structures are provided herein. The method includes forming a plurality of trenches in a dielectric layer extending to an underlying metal layer. The method further includes depositing metal in the plurality of trenches to form discrete metal line islands in contact with the underlying metal layer. The method also includes forming a solder bump in electrical connection to the plurality of metal line islands.
Abstract:
A system and method for eliminating undercut when forming a C4 solder bump for BLM (Ball Limiting Metallurgy) and improving the C4 pitch. In the process, a barrier layer metal stack (20') is deposited above a metal pad layer (19'). A top layer (22') of the barrier layer metals (e.g., Cu) is patterned by CMP with a bottom conductive layer (21 ') of the barrier metal stack (20') removed by etching. The diffusion barrier (40) and C4 solder bump (50) may be formed by electroless plating, in one embodiment, using a maskless technique, or by an electroplating techniques using a patterned mask. This allows the pitch of the C4 solder bumps to be reduced.
Abstract:
A semiconductor device (10) and method has interconnects (38, 40, 42) with adjoining reservoir openings (44, 46, 48). A dielectric layer (20) is formed as part of an uppermost of the one or more interconnect layers (18). Openings (30) formed in the dielectric layer result in modified portions (32) of the dielectric layer along portions of sidewalls of the openings. The openings are filled with a conductive material, such as metal. An exposed portion (22) of the dielectric layer (20) is removed to form protruding pads (38, 40, 42) of the conductive material extending above the dielectric layer. Reservoir openings are formed adjacent the protruding pads by removing the modified portions of the dielectric layer. When the semiconductor device is bonded with another device (100), either a wafer or a die, laterally flowing metal collects in the reservoir openings and ensures that a reliable electrical connection is made between the semiconductor device and the other device.
Abstract:
A method of physically and electrically joining two chips to each other involves aligning an electrically conductive contact of a first chip with a corresponding electrically conductive contact on a second chip, the electrically conductive contact of the first chip being a rigid material and the electrically conductive contact of the second chip being a material that is malleable, bringing the aligned electrically conductive contact of the first chip into contact with the corresponding electrically conductive contact on the second chip, elevating the contact of the chips to a temperature that is below a liquidus temperature for both the rigid material and the material that is malleable while applying pressure to the chips so as to cause the rigid material to penetrate the malleable material and form an electrically conductive connection, and, following the forming of the electrically conductive connection, cooling the contacts to an ambient temperature.
Abstract:
The invention provides a method of attaching an area-array device such as a bumped flip chip (110) to an electrical substrate (150), for example a printed circuit board panel. An underfill material (140) is applied to a portion of the electrical substrate (150), and the underfill material (140) is heated to an underfill material staging temperature. A bumped area-array device (110) is provided, the bumped area-array device (110) including an interconnection surface (112). The interconnection surface (112) of the bumped area-array device (110) is positioned adjacent the applied underfill material (140). The bumped area-array device (110) is heated to electrically connect the connective bumps (120) to the electrical substrate (150).
Abstract:
Un composant de connexion électro-mécanique (10) est muni d'inserts conducteurs (16) destinés à être insérés dans des plots conducteurs respectifs d'un autre composant de connexion pour une hybridation du type face contre face. Chaque insert (16) comporte: une âme métallique (24), non oxydée sur au moins une portion de sa surface, et de dureté supérieure à celle des plots; une première couche métallique non oxydée (26)sur au moins une portion de sa surface, recouvrant au moins ladite portion non oxydée de l'âme (24), la première couche ayant une plasticité supérieure à celle de l'âme; et une seconde couche (28) recouvrant au moins la première couche(26) sur sa portion non oxydée et ayant une plasticité inférieure à celle de la première couche.
Abstract:
Disclosed are a microelectronic assembly (300) of two elements (100, 200) and a method of forming same. A microelectronic element (100) includes a major surface (102), and a dielectric layer (120) and at least one bond pad (110) exposed at the major surface (102). The microelectronic element (100) may contain a plurality of active circuit elements. A first metal layer (130) is deposited overlying the at least one bond pad (110) and the dielectric layer (120). A second element (200) having a second metal layer (230) deposited thereon is provided, and the first metal layer (130) is joined with the second metal layer (230). The assembly (300) may be severed along dicing lanes (301) into individual units each including a chip.