Canfieldite Ag8SnS6 nanoparticles with high light absorption coefficient and quantum yield
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Elsevier
Abstract
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Canfieldite Ag8SnS6 (STS) nanocubes were prepared by the solution decomposition of
precursors using heat-up and hot injection protocols employing coordinating solvents
(oleylamine - OLA and dodecanethiol - DT) to afford monodispersed silver tin sulfide
(STS) nanoparticles. The phase and shape of nanoparticles were tuned by varying
reactants' temperature and mole ratios. The powder X-ray diffraction (p-XRD) and
transmission electron microscopy (TEM) analysis indicate phase pure orthorhombic
Ag8SnS6 nanocrystals with nearly monodispersed particles ranging between 12 and
50 nm. The p-XRD patterns for the STS nanoparticles obtained by the heat-up method
exhibited enhanced peak broadening than the hot injection route, accounting for the
corresponding quantum confinement effects. Likewise, the (124), (227) and (266)
planes of the reflections in OLA/DT capped STS crystals appeared well resolved,
indicating that seed growth of a transitional Ag2S might be involved in the formation of
the ternary chalcogenides. The values of the energy bandgap (Eg) were found in the
range of 1.16–2.60 eV. At the same time, the STS nanoparticles exhibited high photon
absorption and low quantum yield potentials, making them a possible candidate for
photovoltaic cells and enhanced photoelectrochemical performance.
Keywords
QD Chemistry