Enhanced thermoelectric performance of hydrothermally synthesized CuFeS2 nanostructures by controlling the Cu/Fe ratio

In this manuscript, low-cost chalcopyrite (CuFeS2) nanostructures as a potential thermoelectric material are explored. CuxFe1-xS2 (x = 0, 0.1, 0.3 & 0.5) samples were fabricated by simple hydrothermal route. X-ray diffraction pattern reveals the formation of CuFeS2 along with impurity phases of...

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Bibliographic Details
Published in:Materials chemistry and physics 2022-03, Vol.279, p.125765, Article 125765
Main Authors: Rehman, Ubaid ur, Mahmood, Khalid, Ashfaq, Arslan, Ali, Adnan, Tahir, Sofia, Ikram, Salma, Rehman, Abdul, Sahar, Kashaf ul, Ahmad, Waqas, Amin, Nasir
Format: Article
Language:English
Subjects:
Chalcopyrite
CuFeS2
Diffraction patterns
Electrical resistivity
Hall effect
Impurities
Nanostructure
Power factor
Purity
Pyrite
Raman spectroscopy
Seebeck
Seebeck effect
Stoichiometry
Thermoelectric
Thermoelectric materials
Thermoelectricity
XRD
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Summary:In this manuscript, low-cost chalcopyrite (CuFeS2) nanostructures as a potential thermoelectric material are explored. CuxFe1-xS2 (x = 0, 0.1, 0.3 & 0.5) samples were fabricated by simple hydrothermal route. X-ray diffraction pattern reveals the formation of CuFeS2 along with impurity phases of FeS, FeO, and FeS2. The presence of these unwanted impurity phases goes on decreasing while the improvement in phase purity of CuFeS2 was observed with the increase in Cu concentration. This improvement in phase purity leads to enhancement in the Seebeck coefficient from 69 to 92 μV/°C (at 25 °C) by increasing the Cu concentration. Hall measurement reveals the significant enhancement of the electrical conductivity values from 90 to 110 S/cm by increasing the Cu concentration. The enhancement in electrical conductivity was associated with the shifting of Cu/Fe stoichiometry that leads to the generation of more free carriers which leads to a high-power factor value up to 9.31 × 10−5 W/mK2. To support our results, some other supplementary measurements such as Raman spectroscopy and scanning electron microscopy were also performed. •Facile synthesis of CuFeS2 nanostructure by simple hydrothermal method.•Improving the thermoelectric performance of CuFeS2 nanostructure by controlling the Cu/Fe stoichiometry.•Seebeck coefficient and electrical conductivity were enhanced with Cu content.•Thermoelectric Power factor was increased up to ∼9.31 × 10−5 W/mK2 for x = 0.5.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2022.125765