Applied Physics by Naidu S. Mani

Author:Naidu, S. Mani [Naidu, S. Mani]
Language: eng
Format: epub
Publisher: Pearson India
Published: 2009-10-14T16:00:00+00:00

Similarly for holes,

where D p is called diffusion coefficient of holes. Even though the excess electrons and holes diffuses in the same direction, their current densities are in opposite direction because of opposite charge on electron and hole. The total diffusion current is:

If there is concentration gradient along X-direction and if we apply an electric field E on it, then the total current in the semiconductor is the sum of drift and diffusion currents. The total current due to electrons and holes are:

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