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Barrier potential

  1. Jul 19, 2014 #1
    The equation for the barrier potential is as follows:

    Vb = Vt loge(Na*Nd/square(n)) mV
    where Vt=KT/e

    This equation shows that the barrier potential is directly proportional to the temperature. So as temperature increases the barrier potential should increase.

    But in contradiction to this, I have found the following statement:

    " With increase in temperature, more minority charge carriers are produced, leading to their increased drift across the junction. As a result, equilibrium occurs at a lower barrier potential. It is found that the Vb decreases by about 2 mV/0C

    Please explain...
  2. jcsd
  3. Jul 20, 2014 #2

    Simon Bridge

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    There is more than one effect happening here.
    Presumably the equation for the barrier potential did not take into account the minority carrier concentrations.
    Where are you reading this?
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