1. (4pts) The diffused impurities with ________ valence electrons are called don

Question

1. (4pts) The diffused impurities with ________ valence electrons are called donor atoms.

a.4

b.3

c.5

d.0

2. (4pts) A perfect conductor would have zero resistivity (i), and a perfect insulator would have an infinite resistivity (ii). Semiconductors lie between that of conductors and insulators. (iii).

a. i and ii is correct

b. ii and iii is correct

c. All are correct

d. None is correct

3. (4pts) Conductivity, , is the ease with which a given material conducts electricity. The inverse of conductivity is resistivity. It is the ability to control conductivity that makes semiconductors useful as “current/voltage control elements.

a. True

b. False

4. (4pts) There are two ways of producing holes; (i) Promote e-’s from VB to CB,(ii) Add column lll impurities to the semiconductor, (iii) transfer holes from CB to VB .

a. i and II is correct

b. ii and iii is correct

c. all are correct

d. none is correct

5. (4pts) After the electron transitions, the s/c valance band is partially filled and may conduct electric current. (a) What are the two (2) types of s/c currents; and (b) list three (3) excitation mechanisms used to promote an electron into the conduction band. .

6. (4pts) How does the position of the Fermi Level change with

(a)      increasing donor concentration, and

(b)      increasing acceptor concentration ?

7. (5pts) The intrinsic carrier concentration ni is a strong function of Eg and T, but is independent of the dopant concentration. What is the hole concentration in an N-type silicon with 3.5x1016cm–3 of donors?

Explanation / Answer

1-c

As it has one extra electron, which will be donated to semiconductor, it is called donor.

2-c

All the three statements are correct.

3- 1

It is true.

4-b

2nd and third arecorrect

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