Large theoretical thermoelectric power factor of suspended single-layer MoS2

We have calculated the semi-classical thermoelectric power factor of suspended single-layer (SL)- MoS2 utilizing electron relaxation times derived from ab initio calculations. Measurements of the thermoelectric power factor of SL-MoS2 on substrates reveal poor power factors. In contrast, we find the thermoelectric power factor of suspended SL-MoS2 to peak at ∼2.8 × 104 μW/m K2 at 300 K, at an electron concentration of 1012 cm−2. This figure is higher than that in bulk Bi2Te3, for example. Given its relatively high thermal conductivity, suspended SL-MoS2 may hold promise for in-plane thin-film Peltier coolers, provided reasonable mobilities can be realized.