Using first-principles approaches, we have investigated the thermoelectricproperties and the energy conversion efficiency of the paired metal-Br-Aljunction. Owing to the narrow states in the vicinity of the chemical potential,the nanojunction has large Seebeck coefficients such that it can be consideredan efficient thermoelectric power generator. We also consider the nanojunctionin a three-terminal geometry, where the current, voltage, power, and efficiencycan be efficiently modulated by the gate voltages. Such current-voltagecharacteristics could be useful in the design of nano-scale electronic devicessuch, as a transistor or switch. Notably, the nanojunction as a transistor witha fixed finite temperature difference between electrodes can power itself usingthe Seebeck effect.
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