Which two statements correctly describe the role of a semiconductor in a solar cell?
A. The electrons freed from the semiconductors by light exit the cell
and never return.
B. When the semiconductors become charged, current flows from
the negative one to the positive one.
C. When photons are absorbed, electrons from the semiconductor
are freed because of the photoelectric effect.
D. When the semiconductors become charged, current flows from
the positive one to the negative one.