Lecture 3 oms

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Lecture 3 oms

  1. 1. Lecture III. . Transient and Steady-state Photoconductivity in Insulators, Theory and Experiment Small-signal limit Drift Mobility Trapping (shallow and deep)
  2. 2. Transient photoconductivity- determination of the drift mobility
  3. 3. For an applied electric field constant in position and time, E=V/d, where V is the applied potential across the photoconductor, and d its thickness.
  4. 4. Let v be the drift velocity, and μ be the carrier mobility, so, by definition, μ=v/E When the carriers reach the back electrode (x=d), time is their-time- of-flight t. Then μ= (d/t)/(V/d)
  5. 5. Carrier Trapping
  6. 6. Shallow Traps
  7. 7. Deep Traps

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