There is perhaps a large bandgap in the amorphous cell, as its output varies with frequency. • There is perhaps a small bandgap in polycrystalline cells, as at lower wavelengths, its output varies with frequency; at higher wavelengths, its output varies with intensity. • There is a medium-sized bandgap in monocrystalline cells. The output of the monocrystalline cell varies between the outputs of the other 2 cells. At higher wavelengths, the output varies to a certain extent with intensity; at lower wavelengths, the output varies to a certain extent with frequency read more..