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.
Sreekanth Mandati opened a general discussion of one of the papers by Susanne Siebentritt: If the full width at half maximum (FWHM) of the PL peak is larger, is the quasi Fermi level splitting (qFls) accurate (https://doi.org/10.1039/ d2fd00057a)? What if we have shoulder peaks? Susanne Siebentritt replied: If the FWHM of the PL peak at room temperature is 100 meV or larger, the qFls is underestimated by 20 mV or more. But if you can measure external radiative efficiency (ERE) or photoluminescence quantum yield (PLQY), you still get a reliable measurement of the non-radiative loss.Sreekanth Mandati asked: What will be the impact of an extra shoulder to the PL peak on the estimation of qFls? Susanne Siebentritt answered: If the shoulder is on the low energy side, it would not change anything.If the shoulder is on the high energy side (and small) I would make sure that the t region is far enough away from the shoulder. But if it is signicant, I would say, it's rst important to get an idea what causes the shoulder.One thing that can distort the PL spectrum is interference. There is an easy way to check that: keep the PL setup as is and change the angle under which the PL light is detected (ideally between along the normal and nearly gracing). The maxima and minima in the spectrum will shi. 1
The coordination polymer {[Cu2(sba)2(bpg)2(H2O)3]·5H2O}n encapsulates arrays of water molecules H-bonded to the framework displaying a high conductivity value of 0.94 × 10−2 S cm−1 with an activation energy of 0.64 eV.
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