Physics Electronics Quize 2 our name: In “p\" type material, majority carriers a

Question

Physics Electronics Quize 2 our name: In “p" type material, majority carriers and fixed ion would be: a: electrons and positive fix ion b: electrons and negative fix ion e: holes and positive fix ion d:holes and negative fix ion In “n" type material, majority carriers and fixed ion would be: a: electrons and positive fix ion b: electrons and negative fix ion e: holes and positive fix ion d:holes and negative fix ion 2. 3: Answer the following questions based on the E-K diagram for InlP 3.1: Is InP a direct or indirect bandgap semiconductor? Why? PPER LLEY 135 3.2 Which of the following statements is likely to be true? a: The effective mass of electrons at 1 positon is greater than the effective mass of electrons at 2 positon. b: The effective mass of electrons at I positon is less than than the effective mass of electrons at 2 positon

Explanation / Answer

3.1. On the basis of E-K diagram InP is a direct bandgap semiconductor because the maxima (top) of a valence band and minima (bottom) of conduction band occurs at same value of electron momentum.

3.2. a).The effective mass of electrons at 1 positon is greater than effective mass of electrons at 2 positon:TRUE

b).The effective mass of electrons at 1 positon is less than effective mass of electrons at 2 positon:FALSE

because position 1 denotes valence band and bounded electrons while position 2 denotes conduction band and unbounded electrons. Therefore, effective mass of electrons at position 1 is greater than effective mass of electrons at position 2.

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