Electrical and Optical Performance of Epitaxial-free Low-doped Germanium Thermophotovoltaic Device - Mansour Gamel; Gerard Rivera; Álvaro Manuel Medrano; Juan Villa; Gema López; Pablo García-Linares; A. Datas; Moisés Garín; Isidro Martín (15th World Conference On Thermophotovoltaic Generation Of Electricity, 2024)