On the possible non-uniqueness of the conversion of laser radiation into electric current in multijunction monolithic photoconverters

On the example of a two-junction monolithic photoconverter of laser radiation, the comparison of the complete model with a connective tunnel diode and a simplified model in which the tunnel diode is replaced by an electric coupling are performed. It is shown for the first time that for the same values of the problem parameters the complete model can have several solutions based on the tunneling and injection mechanisms of current flow through tunnel diodes. It is shown also that the simplified model gives smaller values of the short circuit current.