The ballistic rectifier differs from all conventional rectifiers as it’s working does not rely on any doping junction or barrier structure. Despite previous studies on the novel working principle and high-speed room temperature operation, the graphene based devices have not been modelled yet to understand the working principle up to very high frequencies. We have hence reported the rectification behaviour and noise spectra of graphene based four-terminal ballistic rectifier utilizing semi-classical drift-diffusion 3D modelling for the first time. We have considered the effects of various traps in modelling similar to ones present in a real device which typically affect the rectification efficiency. Since the device speed generally scales with the carrier mobility, graphene based ballistic rectifiers are expected to operate at THz frequencies for various applications such as communications, detection, and imaging.
In addition, we have demonstrated that different structures of ballistic rectifiers namely three terminals, Y-junction, four terminal ballistic rectifiers with and without antidot can efficiently be utilised to rectify the thermal energy in to the DC voltage at the output terminal as a thermoelectric rectifier.
Arun Kumar Singh
|Prof. Aimin Song, University of Manchester, UK ; Prof. Shahrir R Kasjoo, Universiti Malaysia Perlis (UniMAP), Malaysia