| (2) |
When the connections at the battery are reversed, the positive holes of the p-type semiconductor and the negative pole of the battery attract each other, and the free electrons of the n-type semiconductor and the positive pole of the battery attract each other, thus pulling away from the p-n junction. As a result, a layer that contains neither free electrons nor positive holes is created at the p-n junction, effectively preventing current from flowing through the diode and the electrical circuit |
