Low-bandgap (0.3 to 0.5 eV) InAsSbP thermophotovoltaics: assessment for open-circuit voltage improvements

The spectral response of thermophotovoltaic cells can be considerably extended (compared to that of most current TPV technologies) with devices made in the InAsSbP alloy system. InAsSbP TPV cells demonstrate good quantum efficiencies out to wavelengths of 3500 nm, but the open-circuit voltages are relatively low. We discuss the possible limitations and prospects for improving the open-circuit voltages of InAsSbP TPV cells.