Devices and techniques including process steps make use of recesses in conductive interconnect structures to form reliable low temperature metallic bonds. A fill layer is deposited into the recesses prior to bonding. First conductive interconnect structures are bonded at ambient temperatures to second metallic interconnect structures using direct bonding techniques, with the fill layers in the recesses in one or both of the first and second interconnect structures.

A nucleation suppression layer including a self-assembly material can be formed on a surface of a bonding dielectric layer without depositing the self-assembly material on physically exposed surfaces of first metal bonding pads of a first semiconductor die. Metallic liners including a second metal can be formed on the physically exposed surfaces of the metal bonding pads without depositing the second metal on the nucleation suppression layer. The first semiconductor die is bonded to a second semiconductor die by inducing metal-to-metal bonding between mating pairs of the first metal bonding pads and second metal bonding pads of the second semiconductor die.

A nucleation suppression layer including a self-assembly material can be formed on a surface of a bonding dielectric layer without depositing the self-assembly material on physically exposed surfaces of first metal bonding pads of a first semiconductor die. Metallic liners including a second metal can be formed on the physically exposed surfaces of the metal bonding pads without depositing the second metal on the nucleation suppression layer. The first semiconductor die is bonded to a second semiconductor die by inducing metal-to-metal bonding between mating pairs of the first metal bonding pads and second metal bonding pads of the second semiconductor die.

A method of manufacturing a bonded substrate stack includes: providing a first substrate having a first hybrid interface layer, the first hybrid interface layer including a first insulator and a first metal; and providing a second substrate having a second hybrid interface layer, the second hybrid interface layer including a second insulator and a second metal. The hybrid interface layers are surface-activated by particle bombardment which is configured to remove atoms of the first hybrid interface layer and atoms of the second hybrid interface layer to generate dangling bonds on the hybrid interface layers. The surface-activated hybrid interface layers are brought into contact, such that the dangling bonds of the first hybrid interface layer and the dangling bonds of the second hybrid interface layer bond together to form first insulator to second insulator bonds and first metal to second metal bonds.

A semiconductor device includes: a semiconductor chip; and an Ag fired cap formed so as to cover a source pad electrode formed on the semiconductor chip. The semiconductor chip is disposed on a first substrate electrode, and one end of a Cu wire is bonded onto the Ag fired cap by means of an ultrasonic wave. There is provided a semiconductor device capable of improving a power cycle capability, and a fabrication method of such a semiconductor device.

A method for forming a multilayer conductive structure includes forming a first conductive portion; forming a second conductive portion containing ruthenium (Ru) therein on the first conductive portion; forming a third conductive portion on the second conductive portion; and performing a silicidation process on the second conductive portion.

A method for forming a multilayer conductive structure includes forming a first conductive portion; forming a second conductive portion containing ruthenium (Ru) therein on the first conductive portion; forming a third conductive portion on the second conductive portion; and performing a silicidation process on the second conductive portion.

In one embodiment, a semiconductor device includes a first insulator. The device further includes a first pad provided in the first insulator, and including first and second layers provided on lateral and lower faces of the first insulator in order. The device further includes a second insulator provided on the first insulator. The device further includes a second pad provided on the first pad in the second insulator, and including third and fourth layers provided on lateral and upper faces of the second insulator in order. The device further includes a first portion provided between an upper face of the first pad and a lower face of the second insulator or between a lower face of the second pad and an upper face of the first insulator, and including a metal element same as a metal element included in the first layer or the third layer.

A semiconductor device includes: a semiconductor chip; and an Ag fired cap formed so as to cover a source pad electrode formed on the semiconductor chip. The semiconductor chip is disposed on a first substrate electrode, and one end of a Cu wire is bonded onto the Ag fired cap by means of an ultrasonic wave. There is provided a semiconductor device capable of improving a power cycle capability, and a fabrication method of such a semiconductor device.

A semiconductor device package includes a package substrate having a die attach region, a silicon carbide (SiC) substrate having a first surface including a semiconductor device layer thereon and a second surface that is opposite the first surface, and a die attach metal stack. The die attach metal stack includes a sputtered die attach material layer that attaches the second surface of the SiC substrate to the die attach region of the package substrate, where the sputtered die attach material layer comprises a void percent of about 15% or less. The sputtered die attach material layer may be formed using a sputter gas including at least one of krypton (Kr), xenon (Xe), or radon (Rn). The die attach metal stack may further include a metal interlayer that prevent contacts with a first barrier metal layer during a phase transition of the die attach material layer.