Semiconductor bingo

Exercise and reference answers

Clues and terms

1. Clue

   Where the bound electrons sit.

   Item

   Valence band

2. Clue

   Band the free electrons move in.

   Item

   Conduction

3. Clue

   Energy needed to cross between bands.

   Item

   Band gap

4. Clue

   Pure crystal, electrons equal holes.

   Item

   Intrinsic

5. Clue

   Crystal whose carriers came from doping.

   Item

   Extrinsic

6. Clue

   Deliberate addition of an impurity.

   Item

   Doping

7. Clue

   Pentavalent atom giving a spare electron.

   Item

   Donor

8. Clue

   Trivalent atom leaving one hole.

   Item

   Acceptor

9. Clue

   Band gap wider than three electron volts.

   Item

   Insulator

Instructions

Read each clue and tap the term it describes.

Explanation