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Unit 3.1 The basics of electronics
Page 113


4. Complete the text with the correct words.

SEMICONDUCTORS

Semiconductors conduct electricity 1. than insulators but 2. than conductors. They are made of 3. doped with other substances.
If it is doped with 4. or arsenic, this creates 5. semiconductors, which have one 6. electron per atom. Otherwise, if it is doped with 7. or gallium, this creates 8. semiconductors, which have one 9. per atom.
Semiconductors are used in electronic 10. , electronic 11. , LEDs and OLEDs, and solar 12. .
5. Listen to a professor giving a lesson on semiconductors and match the beginnings and endings.
are made by a P-N type junction.semiconductors are in the middle between conductors and insulators.has four valence electrons.have five valence electrons.makes a P-type semiconductor.can change the conductivity of silicon.electrons tend to move to fill in the holes.are the particles that take part in chemical reactions.
As for conductivity, … →
Silicon… →
Valence electrons… →
Phosphorus atoms… →
Only small amounts of phosphorus… →
Silicon doped with aluminium… →
In a P-N junction, … →
Electronic components such as diodes… →
6. In your own words, describe the process for making both N- and P-type semiconductors. aperta