摘要:
Semiconductor packages (100) that prevent the leaching of gold from back metal layers (118) into the solder (164) and methods for fabricating the same are provided. An exemplary method comprises providing a semiconductor wafer stack (110) including metal pads (112) and a substrate (116). An adhesion/plating layer (115) is formed on the substrate (116). A layer of gold (118) is plated on the adhesion/plating layer (115). The layer of gold is etched in a street area (124) to expose edge portions (128) of the layer of gold (118) and the adhesion/plating layer (115). A layer of barrier metal (130) is deposited to form an edge seal (129) about the exposed edge portions (128). The edge seal (129) prevents the leaching of gold from back metal layers (118) into the solder (162) when the wafer stack (110) is soldered to a leadframe (162).
摘要:
Semiconductor packages (100) that prevent the leaching of gold from back metal layers (118) into the solder (164) during the die attachment process and methods for fabricating the same are provided. A method in accordance with the invention comprises providing a semiconductor wafer stack (110) including a plurality of metal pads (112). An adhesion/plating layer (115) is formed on a surface (119) of a substrate (116). A layer of gold (118) is plated on a surface of the adhesion/plating layer (115). The layer of gold is etched in a street area (124) using standard photolithography techniques to expose edge portions (128) of the layer of gold (118) and the adhesion/plating layer (115). A layer of barrier metal (130) is deposited to form an edge seal (129) about the exposed edges (128) of the layer of gold (118) the adhesion/plating layer (115). The semiconductor wafer stack (110) is diced in the street area (124) and soldered to a leadframe (162) to form a semiconductor package (100) that provides for an edge seal (128) to prevent the leaching of gold from back metal layers (118) into the solder (162).
摘要:
A method includes providing a silicon-containing die and providing a heat sink having a palladium layer over a first surface of the heat sink. A first gold layer is located over one of a first surface of the die or the palladium layer. The silicon-containing die is bonded to the heat sink, where bonding includes joining the silicon-containing die and the heat sink such that the first gold layer and the palladium layer are between the first surface of the silicon-containing die and the first surface of the heat sink, and heating the first gold layer and the palladium layer to form a die attach layer between the first surface of the silicon-containing die and the first surface of the heat sink, the die attach layer comprising a gold interface layer having a plurality of intermetallic precipitates, each of the plurality of intermetallic precipitates comprising palladium, gold, and silicon.
摘要:
The present invention relates to a pharmaceutical vaccine composition for a human cervical cancer, comprising: (a) (i) a L1 virus-like particle (VLP) of human papillomavirus (HPV) type 16, a L1 VLP of HPV type 18, or a combination thereof; and (ii) a deacylated non-toxic lipooligosaccharide (LOS); and (b) a pharmaceutically acceptable carrier; and a method for preparing a human papillomavirus (HPV) L1 virus-like particle (VLP). The pharmaceutical vaccine composition of the present invention is in both Th1-type immune response (cellular immunity) and Th2-type immune response (humoral immunity) against HPV more excellent than Cervrix™ and Gardasil™, exhibiting a superior efficacy as a vaccine for a human cervical cancer.
摘要:
A semiconductor device (51) is provided. The device (51) comprises a die (53) having a contact pad (61) thereon, a redistribution conductor (59) having a base portion (64) which is in electrical communication with the contact pad (61) and a laterally extending portion (63), a bumped contact (65) which is in electrical communication with the redistribution conductor (59), and a passivation layer (57) disposed between the laterally extending portion (63) of the redistribution conductor (59) and the die (53). Preferably, the redistribution conductor (59) is convoluted and is adapted to peel or delaminate from the passivation layer (57) under sufficient stress so that it can shift relative to the passivation layer (57) and base portion (64) to relieve mechanical stress between substrate (69) and the die (53). Bump and coiled redistribution conductor (59) accommodating small CTE mis-match strain without failure allows DCA flip-chip to be reliable without underfill or additional assembly process.
摘要:
The present invention relates to a pharmaceutical vaccine composition for a human cervical cancer, comprising: (a) (i) a L1 virus-like particle (VLP) of human papillomavirus (HPV) type 16, a L1 VLP of HPV type 18, or a combination thereof; and (ii) a deacylated non-toxic lipooligosaccharide (LOS); and (b) a pharmaceutically acceptable carrier; and a method for preparing a human papillomavirus (HPV) L1 virus-like particle (VLP). The pharmaceutical vaccine composition of the present invention is in both Th1-type immune response (cellular immunity) and Th2-type immune response (humoral immunity) against HPV more excellent than Cervrix™ and Gardasil™, exhibiting a superior efficacy as a vaccine for a human cervical cancer.
摘要:
A random pitch impeller for a fuel pump has number of blades. An incremental angle of the blades is set by the expression: Δθ i = ( 360 N ) + ( - 1 ) i × Am × sin ( p 1 × 360 N × i ) × cos ( P 2 × 360 N × i ) , where ΔθI is the incremental angle between the blades, N is the total number of blades (N=2, 3, 5, 7, 11, 13, 17, . . . ), Am is the distribution magnitude of the inter-blade interval (equally divided angle) (0
摘要:
A method includes providing a silicon-containing die and providing a heat sink having a palladium layer over a first surface of the heat sink. A first gold layer is located over one of a first surface of the die or the palladium layer. The silicon-containing die is bonded to the heat sink, where bonding includes joining the silicon-containing die and the heat sink such that the first gold layer and the palladium layer are between the first surface of the silicon-containing die and the first surface of the heat sink, and heating the first gold layer and the palladium layer to form a die attach layer between the first surface of the silicon-containing die and the first surface of the heat sink, the die attach layer comprising a gold interface layer having a plurality of intermetallic precipitates, each of the plurality of intermetallic precipitates comprising palladium, gold, and silicon.