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Electron mobility
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===Relation between mobility and scattering time=== A simple model gives the approximate relation between scattering time (average time between scattering events) and mobility. It is assumed that after each scattering event, the carrier's motion is randomized, so it has zero average velocity. After that, it accelerates uniformly in the electric field, until it scatters again. The resulting average drift mobility is:<ref>{{cite book| author1=Peter Y. Yu|author2=Manuel Cardona|title=Fundamentals of Semiconductors: Physics and Materials Properties| url=https://books.google.com/books?id=5aBuKYBT_hsC&pg=PA205+|access-date=1 March 2011|date=30 May 2010|publisher=Springer| isbn=978-3-642-00709-5|pages=205β}}</ref> <math display="block">\mu = \frac{q}{m^*}\overline{\tau}</math> where ''q'' is the [[elementary charge]], ''m''* is the carrier [[effective mass (solid-state physics)|effective mass]], and {{overline|''Ο''}} is the average scattering time. If the effective mass is anisotropic (direction-dependent), ''m''* is the effective mass in the direction of the electric field.
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