Development of sputtered CuSbS2 thin films grown by sequential deposition of binary sulfides
Por:
Medina-Montes, M. I., Vieyra-Brito, O., Mathews, N. R., Mathew, X.
Publicada:
1 may 2018
Resumen:
In this work, CuSbS2 thin films were developed by annealing binary precursors deposited sequentially by rf magnetron sputtering. The recrystallization process was optimized and the films were extensively characterized using a number of tools such as XRD, Raman, SEM, energy dispersive x-ray spectroscopy, atomic force microscopy, Hall, UV-vis spectroscopy, Ellipsometry, Seebeck, and photoresponse. The influence of annealing temperature on the structure, morphology, elemental composition, optical and electrical properties are reported. Annealing below 350 °C resulted in famatinite (Cu3SbS4) and chalcostibite (CuSbS2) ternaries as well as binary phases. Phase-pure chalcostibite was obtained in the range of 350 °C-375 °C. At 400 °C, although CuSbS2 was predominant, tetrahedrite phase (Cu12Sb4S13) appeared as an additional phase. The elemental composition of the films was slightly sulfur deficient, and the atomic percentages of Cu, Sb and S showed a dependence on annealing temperature. The material properties of the phase-pure CuSbS2 thin films are: optical band gap in the range of 1.5-1.62 eV, absorption coefficient close to 105 cm-1, atomic ratios of Cu/Sb ~1 and (Cu + Sb)/S ~1.2, crystal size 18.3-24.5 nm and grain size 50-300 nm. The films were photo-sensitive, showed p-type semiconductor behavior. Electrical resistivity, carrier density and hole mobility were 94-459 O cm, 1.6-7.0 × 1015 cm-3 and 8.4-9.5 cm2 V-1 s respectively. © 2018 IOP Publishing Ltd.
Filiaciones:
Medina-Montes, M. I.:
Univ Nacl Autonoma Mexico, Inst Energias Renovables, Temixco 62580, Morelos, Mexico
Vieyra-Brito, O.:
Univ Nacl Autonoma Mexico, Inst Energias Renovables, Temixco 62580, Morelos, Mexico
Mathews, N. R.:
Univ Nacl Autonoma Mexico, Inst Energias Renovables, Temixco 62580, Morelos, Mexico
Mathew, X.:
Univ Nacl Autonoma Mexico, Inst Energias Renovables, Temixco 62580, Morelos, Mexico
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