The photovoltaic cell is a valuable source of energy. Describe its construction and how it responds to sunlight.

[3 max]

semiconductors / made of silicon;

(n-type) doped with Group 5 element/As/Sb/P (to provide extra electrons);

(p-type) doped with Group 3 element/B/Ga/Al/In (to create electron holes);

n-type in contact with p-type;

anti-reflective coating;

[2 max]

sunlight gives electrons energy to move from p-type to n-type;

flow through external circuit from n-type to p-type;

Answers, in general, needed to be more specific with an indication of how p-type and n-type are made from silicon. For a straightforward question, performance was not good. One respondent was concerned about the meaning of “construction”.