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Quiz 2 ELEC 4705Wed. Oct. 19 2016
1. (10 marks) Semiconductors
(a) (2 marks) What are the two types of charge carriers present in a semiconductor?
(b) (8 marks) The equation for carrier density in a semiconductor is given by:
n =∫ +∞
0g(E)f(E,EF , T )dE (1)
• What are E and EF ?
• What do we call g(E) and what does it represent?
• What do we call f(E) and what does it represent?
• What therefore does the product G(E)f(E) represent?
• What is the integral “doing”?
• Why can we integrate to ∞?
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ELEC 4705 Electronic Properties of Materials Quiz 2
2. (10 Marks) Semiconductors
(a) What is difference between intrinsic and extrinsic semiconductors? What is thechief advantage of extrinsic semiconductors?
(b) What is the source of resistance in a semiconductor? Why does it produce resis-tance?
2 Oct 19, 2016
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ELEC 4705 Electronic Properties of Materials Quiz 2
3. (10 marks) Light and Materials
(a) What are the three electron/photon events that can occur in a semiconductor?Briefly describe them. (Pictures!)
(b) What does the optical absorption coefficient α for a material represent?
i. Which of the three processes in part a) can be described by α. What would beits sign in each case?
ii. If light is incident on a material and α is positive how does the intensity of thelight vary as it travels through the material?
3 Oct 19, 2016