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. 2021 Jan 22;12:543. doi: 10.1038/s41467-020-20721-z

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© The Author(s) 2021

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Fig. 5 — Antenna is modelled as an equivalent voltage source V_ant that generates ac current I_THz (red arrows) flowing into the source and escaping the FET channel through the gate capacitance. Rectification occurs mainly at the tunnel barrier between source and channel (see band alignment profile in the inset) with voltage-dependent conductance G_S. The doping level and the band gap size is controlled via a simultaneous action of the top and bottom gate voltages, V_tg and V_tg, respectively. The photovoltage, V_ph, is read out between the source and drain terminals.