Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 41: Heterostructures, interfaces, and surfaces
HL 41.6: Vortrag
Donnerstag, 4. April 2019, 16:30–16:45, H31
Cubic tin sulfide nanocrystals: growth mechanism unfolded by organic ligands adsorption — •Elad Segev1,2, Ran Eitan Abutbul1,2, Uri Argaman1, Yuval Golan1,2, and Guy Makov1,2 — 1Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israe — 2Ilse Katz institute for Nanoscale science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105m Israel
Novel metastable cubic phase was recently discovered in tin monosulfide and monoselenide systems. Surface energy calculations and experimental studies indicate that this cubic phase is stabilized by specific ligands adsorption on the surface. The ab-initio computations with adsorbed ligands show lower surface energies for the cubic phase and for the orthorhombic phase than for the pristine surfaces. It is shown that Cl bonds are replacing the missing Sn-S bonds on the surface in the cubic structure. We observe that high ligand concentration reaching a full surface coverage enables the cubic nanoparticles to stabilize while for the same concentration the ORT nanoparticles collapse.