Question

which two statements correctly describe the role of a semiconductor in a solar cell? a. when the semiconductors become charged, current flows from the negative one to the positive one. b. the electrons freed from the semiconductors by light exit the cell and never return. c. when the semiconductors become charged, current flows from the positive one to the negative one. d. when photons are absorbed, electrons from the semiconductor are freed because of the photoelectric effect.

Explanation:

In a solar - cell, when photons are absorbed by the semiconductor, the photoelectric effect frees electrons. Also, current flows from the negative terminal to the positive terminal when the semiconductors are charged. Option B is incorrect as electrons form a circuit and return. Option C has the wrong direction of current flow.

Answer:

A. When the semiconductors become charged, current flows from the negative one to the positive one.
D. When photons are absorbed, electrons from the semiconductor are freed because of the photoelectric effect.