Current-Voltage Characterization of Multi-Port Graphene Based Geometric Diodes for High-Frequency Electromagnetic Harvesting

Towards graphene-based asymmetric diodes: a density functional tight-binding study

“…The wavelength range investigated is 300–3000 nm, which corresponds to more than 98% of solar radiation energy. Recently Mencarelli et al , 60 using Monte Carlo simulations, studied the charge transmittivity of geometric diodes based on graphene patterned with spatial asymmetry for a voltage difference of 1.76 V. With fixed external voltage, charge direction is not relevant for transmittivity, owing to reciprocity. However, when a voltage with the opposite sign is considered, the transmittivity changes due to superposition between voltage and asymmetric geometry, so that I ( V ) asymmetry follows.…”

“…19 Due to the lack of a bandgap, low turn-on voltages make ballistic graphene diodes prime candidates in energy harvesting and microwave detection applications at low received signal levels. 20,21 The combination of a high-frequency rectier and an antenna is referred to as a rectenna in the literature. Rectennas have been successfully employed for energy harvesting at low frequencies in the microwave range and have recently attracted considerable research interest for their application to higher frequencies in the mm-wave, terahertz, [22][23][24] and infrared 25,26 spectral regions.…”

Comprehensive Analysis of Graphene Geometric Diodes: Role of Geometrical Asymmetry and Electrostatic Effects

“…Conversely, in [18] the I -V characteristic is calculated treating graphene as 2-D electron gas that satisfies the Dirac equation. The asymmetry mechanism was also investigated through quantum mechanical simulation using a scattering matrix approach [19], hence including coherent transport effects. However, all the aforementioned theoretical contributions assumed a uniform electric field within the device.…”