In search of a suitable single‐source precursor for the deposition of nanostructured PbS thin films at moderate temperatures under ambient conditions, we have synthesized the ligand N ‐(thiomorpholine‐4‐carbothioyl)benzamide and its corresponding lead(II) complex. The structures of both compounds were determined by single‐crystal X‐ray diffraction. In the complex, two ligands coordinate to a lead(II) atom in hemi‐directed geometry through S and O atoms. Secondary intermolecular Pb⋅⋅⋅S interactions group the complexes into pairs. As bulk powders, both the ligand and complex show nominal composition and purity as evidenced by elemental analysis, 1 H NMR and IR spectroscopy. Thermal analysis of the lead(II) complex was carried out to understand its thermal decomposition behaviour for establishing a thin film fabrication protocol. Thin films of phase‐pure PbS were fabricated using this new molecular precursor at the comparatively low annealing temperature of 250 °C. The film showed nanoparticles with cuboidal morphology and a blue‐shifted optical absorption.
Topological insulators (TIs) form a class of materials whose properties are associated with nongeneric quantum effects. Phenomenologically, TIs are semiconductors in the bulk, but possess metallic surface states of a distinctive quality. These surface states are protected by the topology of the bulk electronic structure. [1] Their momentum (propagation direction) and their spin are locked orthogonally. This stabilization can only be broken by strong perturbation, e.g., by an energy exceeding the topologically nontrivial bandgap of the bulk. As a result, these surface electrons are protected against backscattering from nonmagnetic impurities, [2] leading to dissipation-free charge transport and preservation of spin orientation under suitable conditions. [3] Therefore, TIs are envisioned as promising materials for high-performance spin field-effect transistors [4] and as quantum bits in quantum computing. [5] Despite the strong interest in TIs, the number of TIs experimentally proven as well as useable under "real" conditions is still quite limited.
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