A new nanocrystalline binary phase: synthesis and properties of cubic tin monoselenide

Abutbul, Ran E.; Segev, Elad; Samuha, Shmuel; Zeiri, Leila; Ezersky, Vladimir; Makov, Guy; Golan, Yuval

doi:10.1039/c5ce02437d

Cited by 64 publications

(68 citation statements)

References 43 publications

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“…We assume that this very selective reaction is a result of either electronic or more probably steric/kinetic factors. The 1 H NMR spectrum of 8 clearly shows three singlet resonances in a ratio of 18 : 6 : 6 ratio consistent with presence of a single {Sn-NMe 2 } moiety (δ = 3.18 ppm) and a 1,3-di-tertbutyl-2-dimethylguanidinate ligand (δ = 1.18 26 and 2.34 {NMe 2 } ppm). The 119 Sn{ 1 H} NMR spectrum of 8 consists of singlet resonances (δ = −121.0 ppm).…”

Section: Resultsmentioning

confidence: 72%

Tin guanidinato complexes: oxidative control of Sn, SnS, SnSe and SnTe thin film deposition

et al. 2018

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A family of tin(ii) guanidinate complexes of the general form [{RNC(NMe2)NR}2Sn] (R = iPr (6), Cy (7), Tol (9) and Dipp (10)) and [{tBuNC(NMe2)NtBu}Sn{NMe2}] (8) have been synthesised and isolated from the reaction of tin(ii) bis-dimethylamide and a series of carbodiimides (1-5). The cyclic poly-chalcogenide compounds [{CyNC(NMe2)NCy}2Sn{Chx}] (Ch = S, x = 4 (11); Ch = Se, x = 4 (12), and Ch = S, x = 6 (13)) with {SnChx} rings were prepared by the oxidative addition of elemental sulfur and selenium to the heteroleptic stannylene complex [{CyNC(NMe2)NCy}2Sn] (7) in THF at room temperature. Similarly, reaction of compounds 6 and 7 with an equimolar amount of the chalcogen transfer reagents (SC3H6 and Se[double bond, length as m-dash]PEt3, respectively) led to the formation of the chalcogenide tin(iv) complexes [{RNC(NMe2)NR}Sn(Ch)] (R = Cy: Ch = S (14); R = iPr, Ch = Se (15); R = Cy, Ch = Se (16)) with terminal Sn[double bond, length as m-dash]Ch (14 and 16) and dimeric bridged seleno-tin {Sn2Se2} rings (15), respectively. The mono telluro-compounds [{RNC(NMe2)NR}Sn(Te)] (R = iPr (17); R = Cy (18)) were similarly prepared by the oxidative addition of elemental tellurium to 7 and 8, respectively. All of the tin containing compounds have been investigated by multinuclear NMR (1H, 13C 119Sn and 77Se/125Te, where possible), elemental analysis and single crystal X-ray structural analysis (7, 8, 10-13, 15-18). Thermogravimetric analysis (TGA) was used to probe the possible utility of complexes 6-8, 11-12 and 14-18 as single source Sn and SnCh precursors. The Sn(ii) compounds 6 and 7 have been utilised in the growth of thin films by aerosol-assisted chemical vapor deposition (AACVD) at both 300 and 400 °C. The thin films have been analysed by pXRD, EDS, SEM and AFM and shown to be Sn metal. Subsequent studies provided film growth at temperatures as low as 200 °C. Similarly, the mono-chalcogenide systems 14, 16 and 18 have been utilised in the AACVD of thin films. These latter studies provided films, grown at 300 and 400 °C, which have also been analysed by pXRD, Raman spectroscopy, AFM, and SEM and are shown to comprise phase pure SnS, SnSe and SnTe, respectively. These preliminary results demonstrate the potential of such simple guanidinate complexes to act as single source precursors with a high degree of oxidative control over the deposited thin films.

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Section: Resultsmentioning

confidence: 72%

Tin guanidinato complexes: oxidative control of Sn, SnS, SnSe and SnTe thin film deposition

et al. 2018

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“…The cubic nanoparticles of SnSe, which is designated as a new nanometric cubic phase of tin selenide, can also be synthesized by the hot injection method …”

Section: Preparation Methodsmentioning

confidence: 76%

“…There are 64 atoms (32 Sn atoms and 32 Se atoms) per unit cell in the model of cubic phase SnSe. This new cubic phase belongs to a class of non‐centrosymmetric crystals, which may lead to the discovery of some interesting and potentially useful properties …”

Section: Structure and Bondingmentioning

confidence: 99%

Tin Selenide (SnSe): Growth, Properties, and Applications

et al. 2018

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The indirect bandgap semiconductor tin selenide (SnSe) has been a research hotspot in the thermoelectric fields since a ZT (figure of merit) value of 2.6 at 923 K in SnSe single crystals along the b‐axis is reported. SnSe has also been extensively studied in the photovoltaic (PV) application for its extraordinary advantages including excellent optoelectronic properties, absence of toxicity, cheap raw materials, and relative abundance. Moreover, the thermoelectric and optoelectronic properties of SnSe can be regulated by the structural transformation and appropriate doping. Here, the studies in SnSe research, from its evolution to till now, are reviewed. The growth, characterization, and recent developments in SnSe research are discussed. The most popular growth techniques that have been used to prepare SnSe materials are discussed in detail with their recent progress. Important phenomena in the growth of SnSe as well as the problems remaining for future study are discussed. The applications of SnSe in the PV fields, Li‐ion batteries, and other emerging fields are also discussed.

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“…The atomic positions and crystal symmetry of the π phases were deduced using x-ray and electron diffraction methods for both SnS and SnSe. [1,23,24,25] The new nanometric cubic binary phase of the tin mono-selenide system, π-SnSe, was obtained as cube-shaped nanoparticles. Its structure and atomic positions were adopted from previously reported π-SnS (P2 1 3, a0 = 11.7 Å).…”

Section: Structure and Bondingmentioning

confidence: 99%

Materials Modelling of π‐Phase Monochalcogenides

Segev

Argaman

Makov

2019

Israel Journal of Chemistry

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The π-phase monochalcogenides are a recently discovered new family of cubic semiconductors with band gaps in the infrared. Unusually, they consist of a lowsymmetry, non-centrosymmetric 64 atom simple cubic unit cell and thus may be expected to present exceptional physical properties. Furthermore, they have been obtained only in nanometric form, which raises questions concerning their thermodynamic stability. In a series of studies over the last three years, the authors and others have attempted to unravel the nature and properties of this family of materials through ab-initio materials modelling. An integrated overview of these works is presented here.

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A new nanocrystalline binary phase: synthesis and properties of cubic tin monoselenide

Cited by 64 publications

References 43 publications

Tin guanidinato complexes: oxidative control of Sn, SnS, SnSe and SnTe thin film deposition

Tin guanidinato complexes: oxidative control of Sn, SnS, SnSe and SnTe thin film deposition

Tin Selenide (SnSe): Growth, Properties, and Applications

Materials Modelling of π‐Phase Monochalcogenides

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