What makes up the total current in a semi-conductor?(a) Only diffusion current(b) Only drift current(c) Drift+diffusion current(d) Drift+diffusion+biasing currentI have been asked this question during an interview for a job.My enquiry is from Drift and Diffusion Current in portion Diode Circuit of Analog Circuits

What makes up the total current in a semi-conductor?(a) Only diffusion

1.	What makes up the total current in a semi-conductor?(a) Only diffusion current(b) Only drift current(c) Drift+diffusion current(d) Drift+diffusion+biasing currentI have been asked this question during an interview for a job.My enquiry is from Drift and Diffusion Current in portion Diode Circuit of Analog Circuits
Answer» The correct CHOICE is (c) Drift+diffusion current To explain: In an UNBIASED semi-conductor the drift current is balanced by diffusion current and hence there is no current flowing in the semi-conductor in this condition, but in biased condition both these currents are unbalanced and hence the TOTAL current flowing is the vector sum of both drift and diffusion current.

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