Solar cells as pseudo-Josephson junctions

We have identified pseudo-Josephson effects within currents in solar cells. Compared to the original Josephson junction of superconductors, we were able to obtain theoretical results in one-to-one correspondence with experimental observation of solar cell currents. We applied a pseudo-Josephson junction to the current along the axis of energy, that is, the momentum space. The theoretical form of DC-type currents before integration over frequency was also found to be of the tan-function. This pseudo-Josephson junction is, however, not in real space but in momentum space. Currents of solar cells were not formulated in terms of the unique semiconductor differences between electrons and holes but with our pseudo-Josephson junction in terms of conduction band electrons, energy gap, and valence band electrons in the solar cell materials. The mechanism of solar cell function is thus ascribed to a pseudo-Josephson effect in our scheme.