A multi-layer semiconductor structure includes a first semiconductor structure and a second semiconductor structure, with at least one of the first and second semiconductor structures provided as a superconducting semiconductor structure. The multi-layer semiconductor structure also includes one or more interconnect structures. Each of the interconnect structures is disposed between the first and second semiconductor structures and coupled to respective ones of interconnect pads provided on the first and second semiconductor structures. Additionally, each of the interconnect structures includes a plurality of interconnect sections. At least one of the interconnect sections includes at least one superconducting and/or a partially superconducting material.

A light emitting device including at least one LED stack, electrode pads disposed on the LED stack, and cantilever electrodes disposed on the electrode pads, respectively, in which each of the cantilever electrodes has a fixed edge that is fixed to one of the electrode pads and a free standing edge that is spaced apart from the one of the electrode pads.

A solder member mounting method includes providing a substrate having bonding pads formed thereon, detecting a pattern interval of the bonding pads, selecting one of solder member attachers having different pattern intervals from each other, such that the one selected solder member attacher of the solder member attachers has a pattern interval corresponding to the detected pattern interval of the bonding pads, and attaching solder members on the bonding pads of the substrate, respectively, using the one selected solder member attacher.

A cryogenic under bump metallization (UBM) stack includes an adhesion and barrier layer and a conductive pillar on the adhesion and barrier layer. The conductive pillar functions as a solder wetting layer of the UBM stack and has a thickness. An indium superconducting solder bump is on the conductive pillar. The thickness of the conductive pillar is sufficient to prevent intermetallic regions, which form in the conductive pillar at room temperature due to interdiffusion, from extending through the entire thickness of the conductive pillar to maintain the structural integrity of the UBM stack. The indium (In) solder bump may be formed through electroplating, with the conductive pillar being copper (Cu) and the adhesion and barrier layer being titanium tungsten (TiW) and a thin seed layer of copper (Cu), or a layer of titanium (Ti). The UBM stack eliminates the need for magnetic materials such as nickel (Ni) in the stack, making the stack suitable for cryogenic applications.

In a method of manufacturing a semiconductor device first conductive layers are formed over a substrate. A first photoresist layer is formed over the first conductive layers. The first conductive layers are etched by using the first photoresist layer as an etching mask, to form an island pattern of the first conductive layers separated from a bus bar pattern of the first conductive layers by a ring shape groove. A connection pattern is formed to connect the island pattern and the bus bar pattern. A second photoresist layer is formed over the first conductive layers and the connection pattern. The second photoresist layer includes an opening over the island pattern. Second conductive layers are formed on the island pattern in the opening. The second photoresist layer is removed, and the connection pattern is removed, thereby forming a bump structure.

A display apparatus including a circuit board, at least one LED stack configured to emit light, electrode pads disposed on the at least one LED stack and electrically connected to the at least one LED stack, and electrodes disposed on the electrode pads and electrically connected to the electrode pads, respectively, in which each of the electrodes has a fixed portion that is fixed to one of the electrode pads and an extending portion that is spaced apart from the one of the electrode pads, and the electrodes include at least two metal layers having different thermal expansion coefficients from each other.

A cryogenic electronic package includes at least two superconducting and/or conventional metal semiconductor structures. Each of the semiconductor structures includes a substrate and a superconducting trace. Additionally, each of the semiconductor structures includes a passivation layer and one or more under bump metal (UBM) structures. The cryogenic electronic package also includes one or more superconducting and/or conventional metal interconnect structures disposed between selected ones of the at least two superconducting semiconductor structures. The interconnect structures are electrically coupled to respective ones of the UBM structures of the semiconductor structures to form one or more electrical connections between the semiconductor structures. A method of fabricating a cryogenic electronic package is also provided.

A method for mounting components on a substrate is provided. The method includes providing a positioning plate which has a plurality of through holes. The method further includes supplying components each having a longitudinal portion on the positioning plate. The method also includes performing a component alignment process to put the longitudinal portions of the components in the through holes. In addition, the method includes connecting a substrate to the components which have their longitudinal portions in the through holes and removing the positioning plate.

A package carrier includes a carrier and a light absorption layer. The light absorption layer is disposed on the carrier. The light absorption layer includes a notch at the periphery of the carrier, and the notch is light transmissive so as to expose the carrier to light in a normal direction of the carrier. A semiconductor manufacturing process is also provided.

A solder connection may be surrounded by a solder locking layer (1210, 2210) and may be recessed in a hole (1230) in that layer. The recess may be obtained by evaporating a vaporizable portion (1250) of the solder connection. Other features are also provided.