کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1666232 1518069 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optical properties of titanium trisulphide (TiS3) thin films
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Optical properties of titanium trisulphide (TiS3) thin films
چکیده انگلیسی

Titanium trisulphide thin films have been grown on quartz substrates by sulphuration of electron-beam evaporated Ti layers (d ~ 300 nm) in a vacuum sealed ampoule in the presence of sulphur powder at 550 °C for different periods of time (1 to 20 h). Thin films were characterized by X-ray diffraction, energy dispersive analyses of X-ray and scanning electron microscopy. Results demonstrate that films are composed by monoclinic titanium trisulphide. Films show n-type conductivity with a relatively high resistivity (ρ ~ 4 ± 2 Ω·cm) and high values of the Seebeck coefficient (− 600 μV/K) at room temperature. Values of the optical absorption coefficient about α ~ 105 cm− 1, determined from reflectance and transmittance measurements, have been obtained at photon energies hυ > 2 eV. The absorption coefficient dependence on the photon energy in the range of 1.6–3.0 eV hints the existence of a direct transition with an energy gap between 1.35 and 1.50 eV. By comparing these results with those obtained from bulk TiS3, a direct transition with lower energy is also found which could have been hidden due to the low value of the absorption coefficient in this energy range.


► Thin films of TiS3 have been obtained by sulphuration of Ti layers.
► Optical properties of TiS3 thin films have been determined.
► Optical energy gap of TiS3 has been obtained.
► Optical properties of bulk TiS3 have been measured and compared with those of films.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 535, 15 May 2013, Pages 398–401
نویسندگان
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