At room temperature, a silicon crystal acts approximately like a/an a. Insulator

Question

At room temperature, a silicon crystal acts approximately like a/an a. Insulator b. Semiconductor c. Conductor d. Superconductor An extrinsic semiconductor is a a. Doped semiconductor b. Pure semiconductor c. Good insulator d. Good conductor Silicon that has been doped with a trivalent impurity is called a/an a. P-type semiconductor b. N-type semiconductor c. Intrinsic semiconductor d. Extrinsic semiconductor Silicon that has been doped with a pentavalent impurity is called a/an a. N-type semiconductor b. P-type semiconductor c. Intrinsic semiconductor d. Extrinsic semiconductor In an n-type semiconductor, free electrons are called a. Minority carriers b. Valence electrons c. Majority carriers d. Charge carriers In an n-type semiconductor, holes are called a. minority carriers b. majority carriers c. protons d. charge carriers A heavily doped semiconductor has a. High resistance b. No effect on the semiconductor characteristics c. More heat dissipation d. Low resistance A lightly doped semiconductor has a. Low resistance b. High resistance c. No effect on a semiconductor d. More heat dissipated behaviors The property or ability of a material to support charge flow or electron flow a. Resistance b. Conductance c. Resistivity d. Permeance

Explanation / Answer

10) if an semiconductor is mixed with an impurity then it is called as doped or extrinsic semiconductor

11) the addition of triavalent Impurities creates deficiency of valance electrons called as holes. Basically this type of conductors are called as p-type semiconductor as majority carriers are holes

12) doping with pentavalant Impurities means 5 valance electrons. Four valance electrons of silicon forms bond with four valance electrons of the impurity and the 5 th electron remains free making them as majority carriers. Hence it is n-type

13) as discussed in 12) free electrons are called as majority carriers

14) and it is obvious from the above discussion that holes are minority carriers

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