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GeSn alloys are investigated for high-performance tunneling device applications. Samples with relatively high Sn compositions are characterized. GeSn electronic band structures are calculated and basic material parameters are extracted. Based on the established GeSn parameter sets, direct-gap GeSn tunneling field-effect transistors are simulated and analyzed. A higher Sn composition enhances device...
GeSn alloys are promising materials for electronic device applications. In this paper, GeSn samples with relatively high Sn composition are characterized in detail. The electronic band structures of GeSn alloys are calculated by nonlocal empirical pseudopotential method and the corresponding material parameters are extracted for device simulation. Based on the established GeSn parameter set, line-tunneling...
Because of the ability to concentrate light into subwavelength dimensions, plasmonic nanostructures have become a new frontier of nano-photonics, with promising applications for energy transport and conversion. In this work, we experimentally measure the near field intensity distribution of light squeezed through a subwavelength plasmonic hole in a thin metal film. Both transmission coefficient and...
We inserted a C-containing layer in a metal/Ge structure, using a chemical bath. This layer enabled the Schottky barrier height (SBH) to be modulated. The chemical bath with 1-octadecene and 1-dodecene were performed separately with Ge substrates. The ultrathin C-containing layer stops the penetration of free electron wave functions from the metal to the Ge. Metal-induced gap states are alleviated...
Over the past several decades, trace heavy metal ion pollution, such as Cd(II), Cu(II), Pd(IV), etc., have attracted much attention because of their virulent and hard degradation properties. Recently, great efforts have been devoted to establish new methods and technologies to removal toxic metals. Among them, activated carbon adsorption, especially the modified activated carbon technology has been...
Positron annihilation spectroscopy provides a useful tool for the non-destructive study of subsurface microscopic defects. Variations in the electronic environment, from that of the bulk of the material, caused by defects introduce Coulombic forces which cause positrons to localize at the site of defects. This lifetime can vary from nanoseconds, if the positron forms a positronium atom before annihilation,...
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