Science Daily  April 4, 2022 Researchers in Germany investigated the charge and thermoelectric transport in modulation-doped large-area rubrene thin-film crystals with different crystal phases. They showed that modulation doping allows achieving superior doping efficiencies even for high doping densities when conventional bulk doping runs into the reserve regime. Modulation-doped orthorhombic rubrene achieved much improved thermoelectric power factors. Modulation doping technique avoid impurity scattering in the highly ordered undoped narrow bandgap semiconductor allowing both carrier concentration and mobility to be independently maximized. The work paves new ways to achieve flexible thermoelectric devices to directly generate electrical power from heat in an […]