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Polymer-assisted preparation of nanoscale films of thermoelectric PbSe and PbTe and of lead chalcogenide-polymer composite films
Authors:Erk Christoph  Berger Andreas  Wendorff Joachim H  Schlecht Sabine
Institution:Justus-Liebig-Universit?t Gie?en, Institut für Anorganische und Analytische Chemie, Heinrich-Buff-Ring 58, 35392, Gie?en, Germany.
Abstract:Polymer films of polyethyleneoxide (PEO) or poly(L-lactide) (PLLA) containing a single-source precursor for either PbSe or PbTe were used to produce films of nanoparticles of these thermoelectric materials. The monomeric homoleptic chalcogenolates lead(II) bis-(2,4,6-trifluoromethylphenylselenolate) PbSeC(6)H(2)(CF(3))(3)](2) and lead(II) bis-tris(trimethylsilyl)silyl-tellurolate] PbTeSi(SiMe(3))(3)](2) were used as single-source precursors for the thermolytic formation of the lead chalcogenides. The thickness and the quality of as-obtained thin films depended decisively on the spin-coating conditions, on the polymer, on the precursor concentration in the composite film before thermolysis and on the annealing time. Thin layers of particles of 30-50 nm size and high crystallinity were obtained. They were characterized by X-ray diffraction, thermal analysis and electron microscopy.
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