1. How many types of silicon are used to make a junction used in photovoltaics?
A. 4 B. 2 C. 3 D. 5
2. What element is doped on silicon to make a P-type layer?
A. Aluminum B. Phosphorus C. Boron D. Nickel
3. Which of the following elements is added to silicon to make an N-type layer?
4. True or False: Protons from the sun fall into an electron hole.
A. True B. False
5. The junction of silicon makes what kind of cell?
A. Dry B. Solar C. Chemical D. Nuclear