The output power-density and the efficiency of thermo-tunnel devices are examined as a function of inter-electrode separation, electrode work-function, and temperature. We find that these physical parameters dramatically influence the device characteristics, and under optimal conditions a thermo-tunnel device is capable of delivering a very high output power-density of ～ 10~3 Wcm~(-2). In addition, at higher temperatures, the heat-conversion efficiency of the thermo-tunnel device approaches ～ 10%. comparable to that of a thermoelectric generator. We therefore propose: that thermo-tunnel devices are promising for solid-state thermal energy conversion.
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