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State-of-the-art silicon interposer technology of chip-on-wafer-on-substrate (CoWoS) containing the second-generation high bandwidth memory (HBM) has been applied for the first time in fabricating high-performance wafer-level system-in-package. An ultralarge Si interposer up to 1200mm2 made by a two-mask stitching process is used to form the basis of the second-generation CoWoS (CoWoS-2) to accommodate...
Binary system of CaO-SiO2 glasses enables the apatite formation in simulated body fluid (SBF). However, the presence of phosphate content in SiO2-CaO-P2O5 glasses leads to the formation of orthophosphate nanocrystalline nuclei, which facilitates the generation of carbonate hydroxyapatite; this compound is more compatible with natural bone. The brittle and less flexible properties of bioactive glasses...
We use the combination of high-resolution electron microscopy and density-functional theory to study the atomic structure and electronic effects of grain boundaries in polycrystalline photovoltaic materials such as Si, CdTe, CuInSe2, and CuGaSe2. We find that grain boundaries containing dislocation cores create deep levels in Si, CdTe, and CuGaSe2. Surprisingly, however, they do not create deep levels...
We present time-resolved reflectivity spectra of optically, homogeneously switched photonic crystals. We observe large, ultrafast shifts of stopbands of GaAs/AlAs multilayer structures as well as in the photonic bandgap range of 3D Si inverse opals.
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