(a) In a semi-conductor at room temperature, the intrinsic Carrier Co…

Question

(a) In a semi-conductor at room temperature, the intrinsic Carrier Concentration and resistivity are $1.5 \times 10^{16}/\text{m}^3$ and $2 \times 10^3 \; \Omega\text{-m}$ respectively. It is converted into an extrinsic semiconductor with a doping concentration of $10^{20}/\text{m}^3$. For the extrinsic semi-conductor, calculate the

(i) Minority carrier concentration

(ii) Minority carrier concentration when its temperature is increased to a value at which the intrinsic carrier concentration doubles.

Assume that mobility of minority and majority carriers to be same. (10)

(b) Define and explain "The Mass-Action Law" with reference to Semiconductor material. Explain the extrinsic semiconductors and find out the carrier concentrations in P and n- type of semiconductors. (10)

Related pages

• Intrinsic and Extrinsic Semiconductors — topic
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