
Microfabrication is the process of fabrication of miniature structures of micrometre scales and smaller. Historically, the earliest microfabrication processes were used for integrated circuit fabrication, also known as `semiconductor manufacturing` or `semiconductor device fabrication`. In the last two decades microelectromechanical systems (M...
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http://en.wikipedia.org/wiki/Microfabrication

(from the article `spectroscopy`) ...vacancies, or `holes,` in the valence band can be moved through the solid with externally applied electric fields, collected onto a metal ...
Found on
http://www.britannica.com/eb/a-z/m/85
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