Structural, optical and thermal properties of<i>β</i>-SnS<sub>2</sub>thin films prepared by the spray pyrolysis

Silver sulfide Ag 2 S thin films have been prepared on pyrex and on SnO 2 /pyrex substrates by the spray pyrolysis technique (Dlala et al., Europ. Phys. J. A 2, 13 (1998)) using silver acetate and thiourea as precursors. The depositions were carried out at 200 and 250 C. The X-ray diffraction spectra show that a substrate temperature T s = 250 C with a concentration ratio x = [S]/[Ag] = 2 in the solution allows to obtain well crystallized thin films with a preferential orientation along ( 103) direction. Microprobe analysis as well as X-ray photoelectron spectroscopy (XPS) show that a nearly stoichiometric composition is obtained under these conditions. Moreover, we noticed by the same technique the presence of oxygen and carbon components particularly on the surface, due to a contamination effect. Indeed, it can be seen after etching that the intensity peaks decrease strongly, which indicated the weak proportion of these elements in the bulk of the films.Des couches minces de sulfure d'argent Ag 2 S sont pre Â pare Â es, sur substrats de pyrex et de SnO 2 / pyrex par la technique de pulve Â risation chimique re Â active en phase liquide (Dlala et al., Europ. Phys. J. A 2, 13 (1998)) en utilisant comme pre Â curseurs l'ace Â tate d'argent et la thioure Â e. Les de Â po Ã ts ont e Â te Â fabrique Â s aux tempe Â ratures de substrat 200 et 250 C. Les diagrammes de diffraction de rayons X montrent que les couches de Ag 2 S, re Â alise Â es a Á une tempe Â rature de substrat de 250 C et avec un rapport de concentrations en solution x = [S]/[Ag] = 2, sont assez bien cristallise Â es et les cristallites sont oriente Â es pre Â fe Â rentiellement suivant la direction ( 103). L'analyse par microsonde e Â lectronique (EPMA) et par spectroscopie de photoe Â lectrons X (XPS), montre qu'une bonne stoichiome Â trie est obtenue pour ces conditions d'e Â laboration. De plus, d'apre Á s les spectres obtenus par XPS, nous remarquons la pre Â sence d'e Â le Â ments oxyge Á ne et carbone essentiellement en surface, du Ã a Á un effet de contamination. En effet, la me Ã me technique d'analyse montre qu'apre Á s de Â capage des de Â po Ã ts, l'intensite Â des raies correspondantes diminuent conside Â rablement indiquant leur faible proportion en volume.

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“…Indeed, the increase of the temperature favors the formation of oxides which can be attributed to the spray process as reported elsewhere [11].…”

Section: Epma Studysupporting

confidence: 57%

Physico-Chemical Characterization of Sprayed ?-Ag2S Thin Films

Dlala

Amlouk

Nasrallah

et al. 2000

phys. stat. sol. (a)

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“…4a and plotted alongside is the reported value for bulk SnS 2 in ref. 24 at 300 K. A separate 22-nm sample was also measured later, to confirm the thermal conductivity dependence ( Supplementary Fig. 10 ), and included in Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermoelectric materials by using two-dimensional materials with negative correlation between electrical and thermal conductivity

et al. 2016

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In general, in thermoelectric materials the electrical conductivity σ and thermal conductivity κ are related and thus cannot be controlled independently. Previously, to maximize the thermoelectric figure of merit in state-of-the-art materials, differences in relative scaling between σ and κ as dimensions are reduced to approach the nanoscale were utilized. Here we present an approach to thermoelectric materials using tin disulfide, SnS2, nanosheets that demonstrated a negative correlation between σ and κ. In other words, as the thickness of SnS2 decreased, σ increased whereas κ decreased. This approach leads to a thermoelectric figure of merit increase to 0.13 at 300 K, a factor ∼1,000 times greater than previously reported bulk single-crystal SnS2. The Seebeck coefficient obtained for our two-dimensional SnS2 nanosheets was 34.7 mV K−1 for 16-nm-thick samples at 300 K.

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“…The value of the [9]. The solution and gas flow rates were kept constant at 1.5 and 4 l min −1 , respectively, corresponding to a mini-spray pyrolysis.…”

Section: Films Preparationmentioning

confidence: 99%

Morphological and thermal properties of β-SnS2 sprayed thin films using Boubaker polynomials expansion

Khelia¹,

Boubaker²,

Nasrallah³

et al. 2009

Journal of Alloys and Compounds

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Structural, optical and thermal properties ofβ-SnS₂thin films prepared by the spray pyrolysis

Cited by 15 publications

References 9 publications

Physico-Chemical Characterization of Sprayed ?-Ag2S Thin Films

Physico-Chemical Characterization of Sprayed ?-Ag2S Thin Films

Thermoelectric materials by using two-dimensional materials with negative correlation between electrical and thermal conductivity

Morphological and thermal properties of β-SnS2 sprayed thin films using Boubaker polynomials expansion

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Structural, optical and thermal properties ofβ-SnS2thin films prepared by the spray pyrolysis

Cited by 15 publications

References 9 publications

Physico-Chemical Characterization of Sprayed ?-Ag2S Thin Films

Physico-Chemical Characterization of Sprayed ?-Ag2S Thin Films

Thermoelectric materials by using two-dimensional materials with negative correlation between electrical and thermal conductivity

Morphological and thermal properties of β-SnS2 sprayed thin films using Boubaker polynomials expansion

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Product

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Structural, optical and thermal properties ofβ-SnS₂thin films prepared by the spray pyrolysis