Ultrasonic spray pyrolysis technique to generate a solar absorber coating of Mn-doped α-Fe2O3Carlos David Hernández-Pérez, Enrique Barrera-Calva, Federico González and Victor Rentería TapiaRenew. Energy Environ. Sustain., 6 (2021) 3DOI: https://doi.org/10.1051/rees/2021003