A composite solder, which consisted of solder matrix and intermetallic reinforcements, was manufactured by an innovative method. The cast ingot of the Sn-6.9Cu-2.9Ag alloy has primary Cu 6 Sn 5 intermetallics in dendritic form. After rolling, the intermetallic dendrites are crushed into fine particles and distributed uniformly in the solder matrix. The crushed intermetallic particles do not melt, and they retain their shape during spheroidizing and reflow because of their high melting temperature. Coarsening and gravitational segregation of the particles was observed during reflow and analyzed theoretically.
Mo layer is used as a protective layer of Al metal line causing problems such as hillock and oxidation in TFT-LCDs. When the insulating SiNx and passivation layer is etched to form a contact hole in Mo/Al/Mo trilayered metal line, the upper Mo layer is also removed due to the lack of selectivity of the dry etching process. As a result, IZO layer appear to contact to Al directly, possibly resulting in the formation of Al 2 O 3 increasing the contact resistivity. However, detailed investigation by TEM revealed that there are two amorphous layers, inner and outer layers, preventing the direct contact of IZO to Al layer. The inner layer was enriched with Mo, while the outer layer was enriched with Al and oxygen. Oxygen concentration was considerably reduced in front of the inner layer, indicating the Mo-rich inner layer as a barrier layer against oxygen diffusion. On the other hand, Al concentration was still higher and decreasing continuously across the inner layer, exhibiting fast Al diffusion through the inner layer. It was shown that Al-Mo alloy is able to form an amorphous phase at the interface during deposition because of large difference in melting point between Al and Mo. Based on the observed details, the interfacial amorphous layers are considered to produce thermodynamically stable phase, oxide and intermetallic compound, upon further annealing.
It was found that the mechanism of lowering contact resistance between TCO and Mo/Al/Mo layer is the side ring contact between TCO and top Mo of Mo/Al/Mo. This is contrary to the previous results that used Mo x Al y interfacial layer to explain the low contact resistance of TCO and Mo/Al/Mo layer.[2] H.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.