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Microelectronics Questions (2355)

1. In your own words, Describe the Thomson model of the atom.

Explain, with detailed reference to key experimental work, why this model was

abandoned. [10]

2. In your own words, Outline an experiment showing that electrons exhibit wave-like

properties. [10]

3. In your own words, Explain the difference between intrinsic and extrinsic

semiconductors, and the difference between n-type and p-type semiconductors [20]

4. In your own words, Describe with the aid of Energy Band diagrams, the effect on

the silicon electrical properties of doping with

(i) donor [10]

(ii) accepter [10]

5. In your own words, Explain with the aid of diagrams the behaviours of carrier

concentrations and charge distributions in a semiconductor when a p-n junction is

formed. [10]

6. A solid cylindrical piece of silicon has radius 2mm and length 1cm. Calculate the

resistances along the length of the silicon for each of the following cases:-

(i) the silicon has a donor concentration of 5x1022m-3 [10]

(ii) the silicon has an acceptor concentration of 5x1022m-3 [10]

(iii) the silicon is intrinsic. [10]

[You may assume ni=1.2x1016m-3

, e=0.14m2V-1



, h=0.048m2V-1



, e=1.6x10-


 This tutorial constitutes 20% of the total module mark.

 Deadline:- 4pm, Monday 8

th December 2014.

 Please hand your work in to the School Office.

 Your answers to Qus.1-5 should be approximately 800 words per question

excluding diagrams and equation

My budget is $30

Deadline: 2-3 days.

Habilidades: Engenharia Elétrica, Eletrônica, Microcontrolador

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