Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

Abstract

For this work, a β-phase Cu 2−x Se nanowire and nanoplate, and a Na-doped Cu 2−x Se nanoplate were successfully synthesized using solution syntheses. The morphologies of the Cu 2−x Se nanowire and nanoplate could be easily controlled by changing the synthetic condition. The Na-doped Cu 2−x Se nanoplate was prepared by a simple treatment of the Cu 2−x Se nanoplate with a sodium hydroxide-ethylene glycol solution. The nanopowders were then consolidated to bulk materials using spark plasma sintering (SPS). The phase structure and the microstructure of all of the samples were checked using X-ray diffraction (XRD), high-resolution transmission electron microscope (HR-TEM), and scanning electron microscope (SEM) analyses. The thermoelectric transport properties, such as the electrical conductivity, Seebeck coefficient, carrier concentration, carrier mobility, and thermal conductivity, were measured at temperature ranges from 323 to 673 K. The results show that Na played two important roles: one is reducing the carrier concentration, thereby improving the Seebeck coefficient, the other is reducing the thermal conductivity. Overall, the maximum thermoelectric figure of merit (ZT) of 0.24 was achieved at 673 K in the Na-doped Cu 2−x Se nanoplate.

Doping Effect on Cu2Se Thermoelectric Performance: A Review

“…In this case, even at the same level of doping content, ZT value of Cu 1.94 Na 0.04 Se is lower than Cu 1.96 Na 0.04 Se. Yingshi Jin et al [ 47 ] also conduct experiments on Na doped Cu 2-x Se, but with different synthesis method. The approach they used to consolidate the nano-powders into bulk materials is spark plasma sintering (SPS) other than hot-pressing.…”

Thermodynamic Analysis and Defection Formation in Alloys on the Basis of Lead Selenide Containing Copper

“…Their use in electronics imposes special requirements on properties and quality of structure of the obtained materials. The above stated is confirmed by advances in the synthesis of materials with controlled properties based on PbS [6], PbSe [7] and Cu 2 Se [8].…”

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“…From equation (8), it follows that in terms of high partial pressure of vapors of the components, it is also necessary to take into account the influence of the volume term on the Gibbs partial molar free energy of component i.…”

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