Dimensional Reduction of a Layered Metal Chalcogenide into a 1D Near-IR Direct Band Gap Semiconductor

Reducing the dimensionality of inorganic lattices allows
for the
creation of new materials that have unique optoelectronic properties.
We demonstrate that a layered metal chalcogenide lattice, TiS2, can form a dimensionally reduced crystalline one-dimensional
hybrid organic/inorganic TiS2(ethylenediamine) framework
when synthesized from molecular precursors in solution. This solid
has strong absorption above 1.70 eV and pronounced emission in the
near-IR regime. The energy dependence of the absorption, the near-IR
photoluminescence, and electronic band structure calculations confirm
that TiS2(ethylenediamine) has a direct band gap.