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Sunday, February 9, 2020

#421 Surface-key element of the material system

In general terms, surface is an exterior face of the solid and represents two-dimensional termination of fundamental characteristics displayed by the three-dimensionally distributed atoms in the bulk of the sample. .In the case of crystals, surface also represents an abrupt discontinuity of crystal structure. In practice, a surface can be significantly disturbed by its roughness (even at the nano-scale) as well as process related physical damage.

 

Considering the above, it is clear that electronic properties of the surface and the near-surface region of any solid, including semiconductors, depart significantly from the same properties in the bulk. For instance, due to the increased scattering of electrons resulting from the defective lattice and electrically charged centers in the near-surface region, transport of electrons close to the surface is significantly disturbed as compared to the transport of electrons in the bulk. This effect has a major adverse effect on the operation of semiconductor devices which depend on the surface and interface related phenomena, e.g., Metal Oxide Semiconductor Field Effect Transistors (MOSFET).

Posted by Jerzy Ruzyllo at 09:41 PM | Semiconductors | Link



Semi1source.com/blog is a personal blog of Jerzy Ruzyllo. He is Distinguished Professor Emeritus in the Department of Electrical Engineering at Penn State University. With over forty years' experience in academic research and teaching in semiconductor engineering he has a unique perspective on the developments in this technical domain and enjoys blogging about it.




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