hen the voltage is applied this way round it tends to pull the free electrons and holes apart, and increases the height of the energy barrier between the two sides of the diode. As a result it is almost impossible for any electrons or holes to cross the depletion zone and the diode current produced is virtually zero. A few lucky electrons and holes may happen to pick up a lot of thermal (kinetic) energy. This gives them enough 'go' to cross the barrier, hence the reversed biassed current is not zero, just very, very small
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