Thermoelectric Parameter Modeling of Single-Layer Graphene Considering Carrier Concentration and Mobility With Temperature and Gate Voltage

Abstract

Single-layer graphene (SLG) sheets can exhibit thermoelectric properties under the control of gate voltage. The controlled factors and regulation mechanism of SLG thermoelectric properties have become research hotspots. In this paper, a SLG thermoelectric parameter model considering carrier concentration and mobility with temperature and gate voltage is proposed. Based on the proposed model, the square resistance (R s ) and Seebeck coefficient (S) of the SLG are calculated. The results show that the maximum value of R s decreases from 5.8 K to 3.2 K at the Dirac voltage when the temperature increases from 100 K to 500 K. A large and stable S can be obtained at high voltages and temperatures. The maximum value of S can reach 161.3 µV/K at T = 500 K, exhibiting a more obvious thermoelectric characteristic. Simultaneously, the saturation law of the power factor (Q) with the change of gate voltage and the amplitude regulation of Q by temperature are obtained. This work can provide a theoretical basis for analyzing the thermoelectric characteristics of SLG.

Improving the Energy-Conversion Efficiency of a PV–TE System With an Intelligent Power-Track Switching Technique and Efficient Thermal-Management Scheme

“…Based on the similar device (thermoelectric cooler, TEC) structure, thermoelectric generator (TEG), the electric power can be generated from external heat sources via thermoelectric-energy harvesting and conversion, which is expected to improve the overall utilization rate of energy. The harvesting of electrical energy from thermal energy can be used as a kind of auxiliary cooling [18][19][20][21]. Wang et al proved the principle of thermoelectric conversion using a thermal-reusing scheme in a TEG, where 5.38% of the waste heat was recovered [22].…”