XRD and 119Sn Mössbauer spectroscopy characterization of SnSe obtained from a simple chemical route

Bernardes-Silva, Ana Cláudia; Mesquita, Alessandra Rezende; Neto, Érico de Moura; Porto, A.O.; Ardisson, José D.; Lima, Geraldo Μ. de; Lameiras, Fernando Soares

doi:10.1016/j.materresbull.2005.04.021

Cited by 11 publications

(6 citation statements)

References 27 publications

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“…This is an interesting result because a metastable phase is being observed at lower temperatures. 54,56,102,103 Nanocrystals in the size range from 4-9 nm exhibited quantum confinement effects, similar to the results observed by Franzman et al The indirect band gap varied from E g ¼ 1.2-0.9 eV for nanocrystal sizes ranging from 4-9 nm (Fig. 9a), respectively, while the direct band gap varied from E g ¼ 1.8-1.3 eV over the same size range.…”

Section: Tin Selenide Nanocrystalssupporting

confidence: 86%

Tin and germanium monochalcogenide IV–VI semiconductor nanocrystals for use in solar cells

2011

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The incorporation of colloidal semiconductor nanocrystals into the photoabsorbant material of photovoltaic devices may reduce the production costs of solar cells since nanocrystals can be readily synthesized on a large scale and are solution processable. While the lead chalcogenide IV-VI nanocrystals have been widely studied in a variety of photovoltaic devices, concerns over the toxicity of lead have motivated the exploration of less toxic materials. This has led to the exploration of tin and germanium monochalcogenide IV-VI semiconductors, both of which are made up of earth abundant elements and possess properties similar to the lead chalcogenides. This feature article highlights recent efforts made towards achieving synthetic control over nanocrystal size and morphology of the non-lead containing IV-VI monochalcogenides (i.e., SnS, SnSe, SnTe, GeS and GeSe) and their application toward photovoltaic devices.

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Section: Tin Selenide Nanocrystalssupporting

confidence: 86%

Tin and germanium monochalcogenide IV–VI semiconductor nanocrystals for use in solar cells

2011

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“…The scattering data in Figure B show that SnSe NCs synthesized at 105 °C present XRD signatures with a noticeably larger d spacing for several reflections, providing evidence for character of Cmcm symmetry (JPCD #03-065-3876). In bulk SnSe crystals, the Cmcm structure has previously only been reported to occur after high temperature annealing (600 °C), while, in these NCs, its signature appears more pervasively at lower temperatures. , Unfortunately, the peak broadening inherent to nanoparticles, combined with the close similarity of the two crystal structures, does not allow for conclusive unambiguous assignment of one crystal structure or the other. However, systematic analysis of SnSe NCs synthesized at various temperatures revealed a clear temperature-dependent trend in the spacing of the (131) and (200) planes (Figure C) and a disappearance of the Pnma -characteristic (020) and (112) reflections.…”

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confidence: 99%

“…Beyond illustrating the relationship between NC size and the quantum confined energy gap, we discovered that SnSe NCs exhibit orthorhombic symmetry with a mixture of Pnma and Cmcm space groups, which has previously only been observed in bulk phases at high temperatures. 17,18 We analyzed fundamental NC nucleation and growth aspects and found that the SnSe NC shape is sensitive to the type of surface ligand employed during the synthesis.…”

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confidence: 99%

SnSe Nanocrystals: Synthesis, Structure, Optical Properties, and Surface Chemistry

et al. 2010

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The colloidal synthesis of SnSe nanoparticles is accomplished through the injection of bis[bis(trimethylsilyl)amino]tin(II) into hot trioctylphosphine:selenium in the presence of oleylamine. Through the manipulation of reaction temperature particles are grown with the average diameter reliably tuned to 4-10 nm. Quantum confinement is examined by establishing a relationship between particle size and band gap while the in depth growth dynamics are illuminated through UV-vis-NIR spectroscopy. Surface chemistry effects are explored, including the demonstration of useful ligand exchanges and the development of routes toward anisotropic particle growth. Finally, transient current-voltage properties of SnSe nanocrystal films in the dark and light are examined.

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“…32-1382, and all reflections could be indexed to the orthorhombic phase of SnSe. 46−48 No peaks indicative of Se, SnO 2 , SnSe 2 , or any other impurities were present, and the SnSe samples were thus single-phase. The SnSe/GO and SnSe/GO mod nanocomposites (Figure 3c,d and S1) exhibit similar XRD patterns dominated by the SnSe phase reflections, with the notable observation that the peaks are considerably broader than those from the pristine sample of SnSe.…”

Section: Resultsmentioning

confidence: 99%

Toward New Thermoelectrics: Tin Selenide/Modified Graphene Oxide Nanocomposites

et al. 2019

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New nanocomposites have been prepared by combining tin selenide (SnSe) with graphene oxide (GO) in a simple aqueous solution process followed by ice templating (freeze casting). The resulting integration of SnSe within the GO matrix leads to modifications of electrical transport properties and the possibility of influencing the power factor ( S 2 σ). Moreover, these transport properties can then be further improved ( S , σ increased) by functionalization of the GO surface to form modified nanocomposites (SnSe/GO mod ) with enhanced power factors in comparison to unmodified nanocomposites (SnSe/GO) and “bare” SnSe itself. Functionalizing the GO by reaction with octadecyltrimethoxysilane (C 21 H 46 O 3 Si) and triethylamine ((CH 3 CH 2 ) 3 N) switches SnSe from p-type to n-type conductivity with an appreciable Seebeck coefficient and high electrical conductivity (1257 S·m –1 at 539 K), yielding a 20-fold increase in the power factor compared to SnSe itself, prepared by the same route. These findings present new possibilities to design inexpensive and porous nanocomposites based on metal chalcogenides and functionalized carbon-derived matrices.

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XRD and 119Sn Mössbauer spectroscopy characterization of SnSe obtained from a simple chemical route

Cited by 11 publications

References 27 publications

Tin and germanium monochalcogenide IV–VI semiconductor nanocrystals for use in solar cells

Tin and germanium monochalcogenide IV–VI semiconductor nanocrystals for use in solar cells

SnSe Nanocrystals: Synthesis, Structure, Optical Properties, and Surface Chemistry

Toward New Thermoelectrics: Tin Selenide/Modified Graphene Oxide Nanocomposites

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