IGNOU BPHET 143 2026 - Draw the graph of current density versus electrical field in an intrin

Question

Draw the graph of current density versus electrical field in an intrinsic semiconductor and describe the mechanisms governing the three regions of this plot.

19 Jan 2026

Answer :

Word Count : 281

In an intrinsic semiconductor, the graph of current density J versus applied electric field E is a nonlinear curve that can be divided into three distinct regions, each governed by different carrier transport mechanisms. At low electric fields, the curve is a straight line passing through the origin. In this region, electrons and holes acquire a drift velocity proportional to the applied electric field, given by v_d = μE, where μ is the carrier mobility. Since current density J = nqv_d

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