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Sunday, January 12, 2020

#418 Semiconductor material system

 In order to exploit characteristics of semiconductors, complex material systems comprised of elements featuring desired crystal structure and chemical composition need to be created. The elements comprising such complex material systems include surfaces and near-surface regions, interfaces, and thin-films all of which are the integral parts of semiconductor materials systems used to fabricate functional devices and as such have a performance defining effect on such devices.

  

Only in some cases properties of the bulk of semiconductor play the role determining performance of the device. Typically, characteristics of the surface, near surface region and interfaces with other materials forming the device affect the most workings of the devices regardless of whether device is electronic or photonic. And those characteristics depart significantly from the same characteristics (parameters) in the bulk of semiconductor. For instance, due to the increased scattering of charge carriers resulting from the defective lattice and electrically charged centers in the near-surface region, mobility of charge carriers µ close to the surface is reduced significantly as compared to the carrier mobility in the bulk of semiconductor. This effect has a major adverse impact on the semiconductor devices operation of which depends on the surface and interface related phenomena such as for instance Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) which is undeniable “workhorse” of the digital electronics.

 

Posted by Jerzy Ruzyllo at 09:52 AM | 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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