Single source precursor route to nanometric tin chalcogenides

Abstract

Phase controled chemical synthesis of 2D SnEx (E = S, Se; x = 1, 2) using new, well-characterized molecular precursors is presented.

Molecular Precursors to Group IV Dichalcogenides MS2 (M=Ti, Zr, Hf)

“…This study convincingly demonstrates the influence of the tridentate donor ligand system (HSC 2 H 4 ) 2 NMe that is deterministic in the formation of isotypical monomeric transition metal dithiol complexes serving as potential single‐source precursor to 2D TMDC materials. The reported complexes [M IV (SC 2 H 4 N(Me)C 2 H 4 S) 2 ] extend the already reported family of molecular precursors to transition metal sulfides [37,38] . In an exemplary study, the potential of the titanium compound, [Ti(SC 2 H 4 (Me)C 2 H 4 S) 2 ], as suitable as single molecular source was demonstrated in the deposition of TiS 2 thin films.…”

“…The reported complexes [M IV (SC 2 H 4 N-(Me)C 2 H 4 S) 2 ] extend the already reported family of molecular precursors to transition metal sulfides. [37,38] In an exemplary study, the potential of the titanium compound, [Ti-(SC 2 H 4 (Me)C 2 H 4 S) 2 ], as suitable as single molecular source was demonstrated in the deposition of TiS 2 thin films. In addition to the promising physico-chemical properties of as presented compounds, like adequate volatility, solubility and stability in the gas phase, the coordinative saturation via two tridentate dithiol ligands prevents the metal center from oxidation or polymerization reactions, thereby enabling a simplified precursor transport in the vapor phase that is an essential prerequisite for suitable precursors.…”

“…[36] In this context, soft chemistry routes exploiting the potential of chemically designed precursors in materials synthesis represent a promising approach for "bottom-up" synthesis of TMDC phases. The coordination of the dianionic, chelating tridentate coordinated ligand, N-methyldiethanthiolamine ((HSC 2 H 4 ) 2 NMe), to the early transition metals (Ti, Zr, Hf) delivered molecular compounds of general formula, [M IV (SC 2 H 4 N(Me)C 2 H 4 S) 2 ] [37,38] that were used as attractive precursors for low-temperature synthesis of metal disulfides. The N-methyldiethanthiolamine ligand was previously used in coordination chemistry with tin, [38,39] rhenium, [40] arsenic, antimony and bismuth, [41] technetium [42] as well as tungsten and molybdenum.…”

“…The coordination of the dianionic, chelating tridentate coordinated ligand, N-methyldiethanthiolamine ((HSC 2 H 4 ) 2 NMe), to the early transition metals (Ti, Zr, Hf) delivered molecular compounds of general formula, [M IV (SC 2 H 4 N(Me)C 2 H 4 S) 2 ] [37,38] that were used as attractive precursors for low-temperature synthesis of metal disulfides. The N-methyldiethanthiolamine ligand was previously used in coordination chemistry with tin, [38,39] rhenium, [40] arsenic, antimony and bismuth, [41] technetium [42] as well as tungsten and molybdenum. [37] In this study, the synthesis of novel monomeric and (air-)stable compounds as potential precursors to early transition metal disulfides is presented (Scheme 1).…”

Direct Synthesis of Two-Dimensional SnSe and SnSe2 through Molecular Scale Preorganization

“…Because of the large number of potential applications originating from the structural and electronic properties of tin chalcogenides, there is significant interest in the synthesis of SnSe and SnSe 2 materials that is augmented by their high earth abundance, low toxicity, and mechanical flexibility. Most synthetic routes for tin chalcogenide and tin dichalcogenide materials are based on multisource chemical processing that often suffers from poor control over the target composition and formation of undesired intermediates and secondary phases. ,− In this context, molecular compounds containing preformed metal–chalcogen bonds are attractive precursors for obtaining solid-state materials with the desired chemical homogeneity and crystalline phase purity.…”