Investigation on the structure and thermoelectric properties of Cu_xTe binary compounds

Abstract

The thermal conductivity of Cu2Te is around 4 W m−1 K−1 at 300 K with low Cp values.

Binary and Ternary Colloidal Cu‐Sn‐Te Nanocrystals for Thermoelectric Thin Films

“…[1,4,42,43] This chemical flexibility yields a complex copper telluride system (similar to those of Cu 2−x S and Cu 2−x Se) with different compositions and crystal structures possible, including stoichiometric extremes orthorhombic CuTe and hexagonal Cu 2 Te, as well as nonstoichiometric Cu 2−x Te. [13,44] Here, we assign the crystal phase of Cu 2−x Te NCs synthesized at lower temperatures to the recently reported Cu 31 Te 24 (Cu 1.29 Te) structure. [45] A structural model is provided in Figure S6b, Supporting Information.…”

In Situ Dynamics during Heating of Copper-Intercalated Bismuth Telluride

“…62 Raman spectra collected from our platelets heated ex situ (Figure S4C) also indicate that the final material is Cu 2Àx Te (with x between 0 and 0.4). 61 Finally, the XPS spectra for the platelets heated ex situ show signatures of Cu 0 and Cu 1+ (Figures S4D-S4F), which further suggests the transformation to Cu 2Àx Te. Despite the uncertainty of the crystal structure, our data imply that the general transformation of Cu-intercalated Bi 2 Te 3 to Cu 2Àx Te is applicable to other conditions beyond high vacuum.…”

“…The Cu 2 Te crystals have a layered hexagonal crystal structure with a P3m1 space group. 60,61 We note that Cu 2Àx Te compounds are known to exhibit slightly substoichiometric compositions (Cu deficiency), which allows for a variety of closely related but distinct crystal structures, and recent DFT calculations have shown that Cu 2Àx Te can exhibit low-energy monoclinic and trigonal structures. 62 We index the observed material in Figure 3 to the P3m1 structure due to the close match to the expected SAED peaks, as well as the Cu/Te ratio that is close to 2.0 (1.9:1), as detailed subsequently in Figure 6.…”

Synthesis of Copper Telluride Thin Films by Electrodeposition and Their Electrical and Thermoelectric Properties

“…Previously reported copper telluride bulk and thin film samples (Mansour et al, 1986;Nethravathi et al, 2014;Ghosh et al, 2016;Mukherjee et al, 2019;Mukherjee et al, 2020) exhibited relatively low Seebeck coefficients of between 4 and 40 μV K −1 . While electrodeposited Cu 0.5 Te showed a particularly high Seebeck coefficient (346 μV K −1 ), the Cu 0.5 Te thin film is extremely poorly electrically conductive, which results in a low power factor (2.48 μW cm −1 K −1 ).…”

“…Table 1 lists the thermoelectric properties of the electrodeposited thin films and others reported in the literature (Mansour et al, 1986;Nethravathi et al, 2014;Ghosh et al, 2016;Mukherjee et al, 2019;Mukherjee et al, 2020), including Seebeck coefficients, conductivities, and calculated power factors. The electrodeposited thin films have somewhat larger Seebeck coefficient than their bulk counterparts.…”