ACS Applied Materials & Interfaces · 2016 · 101 citations · 33 references
Natural SciencesMaterials EngineeringMaterials ScienceElectronic MaterialsSemiconductor MaterialsThin FilmsDopingHeat ConductionThermal Properties Of MaterialsThermoelectric MaterialsThin Film Electrical PropertiesThin Film Thermal PropertiesCrystallinityDopant IncorporationElectrical Conductivity EnhancementLattice Thermal ConductivityPower FactorSeebeck CoefficientThermal ConductivityThermoelectric Properties
We investigated the effect of single and multidopants on the thermoelectrical properties of host ZnO films. Incorporation of the single dopant Ga in the ZnO films improved the conductivity and mobility but lowered the Seebeck coefficient. Dual Ga- and In-doped ZnO thin films show slightly decreased electrical conductivity but improved Seebeck coefficient. The variation of thermoelectric properties is discussed in terms of film crystallinity, which is subject to the dopants' radius. Small amounts of In dopants with a large radius may introduce localized regions in the host film, affecting the thermoelectric properties. Consequently, a 1.5 times increase in power factor, three times reduction in thermal conductivity, and 5-fold enhancement in the figure of merit ZT have been achieved at 110 °C. The results also indicate that the balanced control of both electron and lattice thermal conductivities through dopant selection are necessary to attain low total thermal conductivity.
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Transition metal oxides – Thermoelectric properties
Sumeet Walia, Sivacarendran Balendhran, Hussein Nili et al. · Progress in Materials Science · 2013 · 371 citations