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High pressure air blowing liquid solder and synchrotron radiation x-ray real-time imaging technology were used to study the interface reactions of Sn-XAg/Cu (X=0, 1, 3) joints during reflow with various soldering time under temperature of 250/275/300°C. This experiment allows us in-situ observe the interfacial IMCs growth and completely avoids Cu6Sn5 precipitation from the solder in cooling stage...
Synchrotron radiation x-ray real-time imaging technology was used to study the interface reactions of Sn/Cu and Sn0.7Cu/Cu joints during reflow with soldering time of 1h under temperature of 300/350 °C. This experiment allows us in-situ observe the interfacial IMCs growth and completely avoids Cu6Sn5 precipitation from the solder in cooling stage to affect the morphology and thickness of interfacial...
In the report, we propose a multiple stepped superlattice (MS-SL) structure, in which GaAs stepped-potential layers are sandwiched between strain-balanced InGaAs wells and GaAsP barriers, for photovoltaic application. Comparison between the normal SL cell and MS-SL cell indicate that the step design in MS-SL cell enhanced sunband absorption to the host bulk material, while reduced overall recombination...
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