Specialist reading

13. Read the text “Silicon”. Find the answers to the following questions.

1. What’s silicon like in its pure form?

2. Is it a common element?

3. What is the structure of sand?

4. How can we make a very thin insulation?

5. What happens if an electric field is set up in the crystal of silicon?

6. What type of conduction do we call intrinsic?

7. Is silicon a conductor, a semiconductor or an impurity semiconductor? And what about the silicon oxide?

8. Can you name a very efficient way of causing extrinsic conductivity?

9. What elements are usually employed as impurities?

10. Name some impurities. Explain your choice.