Enhancement of thermoelectric performance by tuning selenium content in the Cu2SnSe3 compound
Source abstract
Abstract
Abstract To investigate the thermoelectric properties, we have attempted to tune selenium content in Cu2SnSe3-δ (−0.04 ≤ δ ≤ 0.1) compounds synthesized via the conventional solid-state reaction. Electrical and thermal properties are presented in the low and near room temperature regime (10–350 K). The lowest electrical resistivity is observed for the compound with δ = 0.08. The electron-phonon coupling and the presence of small polarons are experimentally validated from temperature-dependent electrical and thermal transport data. A decrease in the Seebeck coefficient along with carrier concentration is observed, verifying the linear electron band dispersion. A downward shift of the Fermi level deep into the valence band is realized in the case of non-stoichiometric samples, thereby reducing the Seebeck coefficient. A maximum power factor of ~50 μWmK−2 is achieved for the sample with δ = 0.04, which is about twice that of the pristine compound. The highest ZT of ~0.01 is obtained for the compound with δ = 0.08. The observed results suggest that stoichiometry plays a vital role in tuning the thermoelectric properties in the Cu2SnSe3 compound.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Chalcogenide Semiconductor Thin Films · Thermal Expansion and Ionic Conductivity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. Introduction to thermoelectricity10.1533/9781845690915.3.339 ↗
2. Complex thermoelectric materials10.1038/nmat2090 ↗
3. High thermoelectric and mechanical performance in highly dense Cu2-xS bulks prepared by a melt-solidification technique10.1039/C5TA01667C ↗
4. The prediction of semiconducting properties in inorganic compounds10.1016/0022-3697(58)90050-7 ↗
5. Thermoelectric properties of Zn doped Cu2SnSe310.1016/j.matchemphys.2014.06.054 ↗
6. Thermoelectric properties of Mn doped Cu2SnSe310.1007/s11664-011-1873-9 ↗
7. The low and high temperature thermoelectric properties of Sb doped Cu2SnSe310.1016/j.materresbull.2016.06.002 ↗
8. Effect of annealing temperature on the phase transition, band gap and thermoelectric properties of Cu2SnSe310.1039/C7TC05180H ↗
9. New monoclinic phase at the composition Cu2SnSe3 and its thermoelectric properties10.1021/ic401317k ↗
10. Thermoelectric properties of Cu2SnSe4 with intrinsic vacancy10.1021/acs.chemmater.6b02416 ↗
11. Thermoelectric properties of copper-deficient Cu2-xSe (0.05 ≤ x ≤ 0.25) binary compounds10.1016/j.ceramint.2017.05.161 ↗
12. High-temperature thermoelectric properties of Cu1– xInTe2 with a chalcopyrite structure10.1063/1.3678044 ↗
13. Enhanced thermoelectric performance of nonstoichiometric compounds Cu3-xSbSe4by Cu deficiencies10.1007/s11664-014-3018-4 ↗
14. Tuning the thermoelectric properties by manipulating copper in Cu2SnSe3system10.1016/j.jallcom.2018.03.136 ↗
15. Role of cation vacancies in Cu2SnSe3 thermoelectrics10.1021/acsami.9b01348 ↗
16. Effect of secondary phases on thermoelectric properties of Cu2SnSe310.1016/j.ceramint.2017.02.126 ↗
17. Optical absorption, Raman spectra, and electrical properties of Mn-doped Cu2SnSe3 semiconductor compound10.1002/pssb.201552656 ↗
18. The Scherrer equation versus the 'Debye-Scherrer equation10.1038/nnano.2011.145 ↗
19. X-ray analysis by Williamson-Hall and size-strain plot methods of ZnO nanoparticles with fuel variation10.4236/wjnse.2014.41004 ↗
20. Nanosyst. Physics, Scherrer formula: estimation of error in determining small nanoparticle size
21. Thermoelectric properties and nonstoichiometry of GaGeTe10.1016/j.jssc.2012.03.030 ↗
22. Large-scale colloidal synthesis of non-stoichiometric Cu2ZnSnSe4 nanocrystals for thermoelectric applications10.1002/adma.201202860 ↗
23. Adiabatic and non-adiabatic small-polaron hopping conduction in La1 − xPbxMnO3 + δ (0.0 ≤x ≤0.5) type oxides above the metal – semiconductor transition10.1088/0953-8984/13/42/310 ↗
24. Low-temperature thermoelectric properties of the CeSe2-xSnx compounds10.1016/j.jallcom.2014.08.130 ↗
25. Thermoelectric properties of CuSbSe2 and its doped compounds by Ti and Pb at low temperatures from 5 to 310 K
26. The resistance and thermoelectric properties of the transition metals
27. Thermoelectric transport properties of n-doped and p-doped Bi0.91Sb0.09 alloy thin films10.1063/1.369729 ↗
28. Enhanced thermoelectric performance in copper deficient Cu2GeSe310.1016/j.jallcom.2017.06.133 ↗
29. Complex electronic structure and compositing effect in high performance thermoelectric BiCuSeO10.1038/s41467-019-10476-7 ↗
30. New stannite-like p-type thermoelectric material Cu3SbSe410.1088/0022-3727/44/29/295404 ↗
31. Skutterudite antimonides: quasilinear bands and unusual transport10.1103/PhysRevB.50.11235 ↗
32. On the design of high-efficiency thermoelectric clathrates through a systematic cross-substitution of framework elements10.1002/adfm.200901817 ↗
33. Investigation of thermoelectric properties of Cu2GaxSn1-XSe3 diamond-like compounds by hot pressing and spark plasma sintering10.1016/j.actamat.2013.04.003 ↗
34. Intrinsically minimal thermal conductivity in cubic I-V-VI2 semiconductors10.1103/PhysRevLett.101.035901 ↗
35. Ashcroft · 1976
36. P-type Bi2Se3 for topological insulator and low-temperature thermoelectric applications10.1103/PhysRevB.79.195208 ↗
37. Characterization of Lorenz number with Seebeck coefficient measurement10.1063/1.4908244 ↗
38. On the Lorenz number of multi-band materials10.1103/PhysRevB.95.125206 ↗
39. Reduction in thermal conductivity and electrical resistivity in Cu2SnSe3/Cu2Se composite thermoelectric system10.1016/j.materresbull.2019.110607 ↗
40. Thermoelectric properties of the Yb9Mn4.2-xZnxSb9 solid solution10.1039/C4TA00539B ↗