R. T. Hinkey, H. Lotfi, L. Li, R. Q. Yang, J. F. Klem, J. C. Keay, M. B. Johnson, “Interband Cascade Thermophotovoltaic Devices with Type-II Superlattice Absorbers of ~0.4 eV Bandgap”, The 39th IEEE Photovoltaic Specialists Conference, Tampa, FL, June 16-21, 2013.
