Structural and transport properties of Cu2CoSnS4 films prepared by spray pyrolysis

Khouja, Outman El; Assahsahi, Ilhame; Nouneh, Khalid; Touhami, M. Ebn; Secu, M.; Talbi, A.; Khaaissa, Yassine; Matei, Elena; Stancu, V.; Galaţanu, A.; Gâlcă, A.C.

doi:10.1016/j.ceramint.2022.07.185

Cited by 8 publications

(2 citation statements)

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“…The PF of the CZFCTS-1 thin films was substantially improved by annealing (Figure c). Compared to the CZTS films (Figure ), the CZFCTS-1 thin films annealed for 24 h show significant enhancement in maximum PF, by a factor of ∼22, with a PF of ∼2.4 μW cm –1 K –2 at 575 K. Figure e provides a comparison of the maximum PF values obtained in this work to that of published data for analogous polycrystalline quaternary sulfide (Cu 2 BSnS 4 (CBTS), where B = Mn, Fe, Co, Ni) bulk materials and thin films. ,,,,,,− Our maximum PF values are significantly higher than all previous reports for single-phase CZTS-based thin films and most polycrystalline bulk materials. This outstanding result demonstrates that cosubstitution of high levels of Cd and Fe into CZTS is an effective approach to increasing the power factor of thin films, and, furthermore, that postdeposition annealing can both enhance film quality and significantly improve charge transport.…”

Section: Resultsmentioning

confidence: 61%

“…(d) Dependence of S , σ, and PF at 575 K on postdeposition annealing time. (e) Comparison of the maximum PF value obtained in this work and published data for single-phase polycrystalline quaternary sulfide (Cu 2 BSnS 4 (CBTS); B = Mn, Fe, Co, Ni) bulk and thin film materials. ,,,,,,− The uncertainty bars show uncertainties of 5, 3, and 10% in the S , σ, and PF values, respectively.…”

Section: Resultsmentioning

confidence: 79%

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Exceptional Thermoelectric Performance of Cu₂(Zn,Fe,Cd)SnS₄ Thin Films

Liu,

McNaughter,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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High-quality Cu 2 (Zn,Fe,Cd)SnS 4 (CZFCTS) thin films based on the parent CZTS were prepared by aerosol-assisted chemical vapor deposition (AACVD). Substitution of Zn by Fe and Cd significantly improved the electrical transport properties, and monophasic CZFCTS thin films exhibited a maximum power factor (PF) of ∼0.22 μW cm −1 K −2 at 575 K. The quality and performance of the CZFCTS thin films were further improved by postdeposition annealing. CZFCTS thin films annealed for 24 h showed a significantly enhanced maximum PF of ∼2.4 μW cm −1 K −2 at 575 K. This is higher than all reported values for single-phase quaternary sulfide (Cu 2 BSnS 4 , B = Mn, Fe, Co, Ni) thin films and even exceeds the PF for most polycrystalline bulk materials of these sulfides. Density functional theory (DFT) calculations were performed to understand the impact of Cd and Fe substitution on the electronic properties of CZTS. It was predicted that CZFCTS would have a smaller band gap than CZTS and a higher density of states (DoS) near the Fermi level. The thermal conductivity and thermoelectric figure of merit (zT) of the CZFCTS thin films have been evaluated, yielding an estimated maximum zT range of 0.18−0.69 at 550 K. The simple processing route and improved thermoelectric performance make CZFCTS thin films extremely promising for thermoelectric energy generation.

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