Responsivity>7V-1 (45)
The asymmetry FOM (Figure of Merit), defined in Equation 43, is the absolute ratio of forward to reverse current at a bias, a value of 1 indicating full symmetry and hence no rectification. The non-linearity FOM, as defined by Equation 44, is the ratio of the differential conductance to the conductance and is a measure of the deviation from a linear resistor. Finally, the responsivity FOM defined in Equation 45 is the ratio of the second derivative of the I-V curve and the differential conductance and is a measure of the rectified signal as a function of input power. The rectification process will be more efficient if the diode will exceeds the values in equations 43,44,45. Moreover, the MIM diode must be very fast to IR regime therefore 1) the insulator layer should be on the order of a few nanometers, by doing so, it is possible to allow sufficiently large electrical current and to ensure the tunneling effect 2) diode capacitance must be small, as consequence, the device area must be small below