Potential barrier profile between electrodes with different temperatures and electrode work functions. The solid line is the real potential profile taking into account the image charge correction, the dotted one is the trapezoidal approximation without correction.
An electron with a given lower than crosses the potential barrier between the and coordinates with a tunneling probability lower than 1. If is higher than , there is no more tunneling effect and the electron is emitted with a probability equal to 1.
Barrier height without bias voltage vs barrier length and different work functions for both electrodes.
Current density (a) and power density (b) vs voltage between electrodes with , and .
Variations of and depending on with fixed at in the case of a gap length.
Variations of and conversion efficiency depending on with fixed at in the case of a gap length.
Variations of and vs barrier length for , and .
Maximum power density and conversion efficiency vs barrier length with , and .
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