Statement I: An electron on 
-side of a 
junction moves to 
-side just an instant after drifting of charge carriers occurs across junction plane.
Statement II: Drifting of charge carriers reduces the concentration gradient across junction plane.
In the light of the above statements, choose the most appropriate answer from the options given below.
Text Solution
Verified by ExpertsB
Statement I is correct but Statement II is incorrect.
Due to diffusion of electrons, positive space-charge region on 
-side of the junction and negative space charge region on 
-side of the junction, an electric field directed from positive charge towards negative charge develops. Electric field is from 
-side to 
-side. Due to this field, an electron on 
-side of the junction moves to 
-side and a hole on 
-side of the junction moves to 
-side. The motion of charge carriers due to the electric field is called drift. Thus, a drift current, which is opposite in direction to the diffusion current starts. Concentration gradient is due to doping of sides. It is not affected by drift of charge carriers.
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