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Title - Computational Electronics/Optoelectronics - Toshishige Yamada's Figures
This is a figure of a field-effect transistor
In the field-effect transistors, we use semiconductors for channels and metals for contact electrodes. We have so far identified semiconducting and metallic chains, depending on the number of chemical bonds between the chain and the substrate atoms. We have also shown that these chains can be electronically isolated from the substrate even when chains are firmly secured to it by chemical bonding, based on the surface-state formation.

This is a figure of a metal (electrode) - semiconductor (nanotube) junction
We are modeling/analyzing carbon nanotube transistors. The project has double meaning. It itself explores the possibility of nanotube device applications, and also gives a significant insight for how general nanodevices would perform. In the experiment, there is a unique behavior in the subthreshold characteristics and we have shown that this is due to the metallic electrode contacts at the source and the drain. This metal (electrode) - semiconductor (nanotube) junction plays a crucial role in electronics applications.
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