W. Huang, L. Li, J. A. Massengale, R. Q. Yang, T. D. Mishima, M. B. Santos, “Investigation of narrow bandgap interband cascade thermophotovoltaic cells”, talk 10913-42 at Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VIII at Photonics West, San Francisco, CA, Feb.2-7, 2019 (in Proc. SPIE. 10913, 1091317).