EC > GATE 2026 > Diffusion Current
Consider that the concentration of electrons in a semiconductor bar varies linearly from 2 × 1017 cm−3 at x = 1 μm to 1 × 1016 cm−3 at x = 4 μm along the x-direction. Assume that the concentration of electrons is not varying along other directions (that is along y- and z-directions).
[Given: the mobility of electron is 1400 cm2V−1s−1, thermal voltage is 25 mV and electronic charge is 1.6× 10−19 Coulomb.]
The density of electron diffusion current (in A/mm2) is __.
(rounded off to two decimal places)
[Given: the mobility of electron is 1400 cm2V−1s−1, thermal voltage is 25 mV and electronic charge is 1.6× 10−19 Coulomb.]
The density of electron diffusion current (in A/mm2) is __.
(rounded off to two decimal places)
Correct :
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