Worksheet 1a
Choose the right answer:
1. PV cells become electrically conductive on exposure to: (air/ heat)
2. Added to n- semiconductor layer material are foreign atoms possessing (more/ fewer)
free electrons.
3. An n-type semiconductor layer is meant to protect the PV. (true/ false)
4. Contact fingers together with the (front/rear)-side metal contact, make up the terminals
to which a consumer can be connected.
5. Silicon is the first most frequently found element in the Earth’s crust. (true/ false)
6. A silicon atom has (four/three) valence electrons.
7. In a silicon crystal, (one/two) electrons of neighbouring atoms form a (pair/ crystal)
8. When an electron pair breaks up, electrons stay immobile. (true/false)
9. After releasing the energy it previously absorbed, the drifting electron returns to its
original hole. (true/false)
10. There is no way to separate the electrons from the electron holes. (true/false)
11. (Impurity /Purity) atoms permit an electrical field to be generated inside a
semiconductor.
12. Atoms with (three/ four) electrons each are integrated into another section, known as
p-semiconductor or p-doped.
13. A p-n junction is formed by (separating/joining) p- and n-semiconductor layers.
14. Electrons from the n-layer drift across this junction to the p-layer, where they combine
with (the holes/ each other).
15. The charge separation in p-n junction creates an electric field across the semiconductor
junction, also termed (space-charge/electric-charge) region.
CLIL4U 537672-LLP-1-2013-1-DK-KA2-KA2MP
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