PbS x Se1−x thin films from the thermal decomposition of lead(II) dodecylxanthate and bis(N,N-diethyl-N′-naphthoylselenoureato)lead(II) precursors

Abstract

Thin films of PbS x Se (1-x) (0 ≤ x ≤ 1) have been deposited by spin coating of bis(dodecylxanthato)lead(II) (1) and/or bis (N,N-diethyl-N′-naphthoylselenoureato) lead(II)(2) complexes onto glass substrates followed by heating. The mole fraction of the selenium precursor in the coating mixture was varied from 0 to 1 by mixing the S and Se precursors.The as-prepared thin films were then heated at temperatures ranging from 250 to 400 °C.Powder X-ray diffraction (p-XRD) showed all films were of the halite structure with preferred orientation along (200) plane. The PbS films showed a closely packed network of nanorods, each comprised of smaller nanoparticles. The nanorods were about 500 nm in length and 25 nm in width; the adhered particles had ca. 30 nm sides. The PbSe nanoparticles were also cubic. The alloys showed an intermediate morphology between the rods and cubes depending on the precursor ratio in the coating mixture. The band gaps estimated from Tauc plots for the films heated at 250 °C for 30 minutes were 1.03 and 0.79 eV for PbS and PbSe respectively. The alloyed PbS x Se (1-x) thin films exhibited band gaps between those of PbS and PbSe. The band gaps and lattice parameters of the alloys varied in a Vegardian manner and could be closely correlated to the composition of the precursor mixture.2

Synthesis of a Novel Single-Source Precursor for the Production of Lead Chalcogenide Thin Films

“…Ternary lead chalcogenide nanocrystals (PbS x Se 1−x ) [20][21][22], in comparison with the binary counterparts PbS [13,14,19,23,24] and PbSe [25], have not been studied extensively. Ternary semiconductor nanomaterials have distinct properties from the binary compounds.…”

Lead ethyl dithiocarbamates: efficient single-source precursors to PbS nanocubes

“…PbS nanomaterials have been synthesized using several techniques; however, the spin coating of SSPs onto substrates followed by annealing at moderate temperatures offers a simple, quick, cost-effective and industrially scalable route for the production of high-quality thin films [6,20,21]. Depending on the reaction conditions, several morphologies have been reported [22,23].…”

Acylselenoureato bis(chelates) of lead: synthesis, structural characterization and microwave-assisted formation of PbSe nano- and microstructures

“…In this respect, the group of the late O'Brien reported the use of lead(II) acylselenoureas in the aerosol-assisted preparation of PbSe thin films as well as the synthesis of PbSe nanoparticles using trioctylphosphine (TOP) as stabilizing reagent. [6][7][8][9][10] Ionic liquids (ILs) represent an interesting and by now quite established option for the stabilization of colloidal systems besides conventional stabilizing agents such as TOP or hexadecylamine (HDA), which are strongly bound to the particle surface. [11][12][13] Because of this, nanoparticles are electrosterically stabilized by various directed intermolecular interactions, or in other words, by a combination of steric and electrostatic effects.…”

“…Although a large number of inorganic nanostructures has been prepared in ionic liquids, including PbS, [14][15][16][17] to our knowledge only very few syntheses of PbSe nanoparticles using this novel group of compounds have been described in the literature. 18 Therefore, on basis of O'Brien's work [6][7][8][9][10] and our experience with microwave-assisted synthesis of various nanoparticles in ionic liquids, we report herein a study of acylselenoureato lead(II) complexes as potential precursors compounds for PbSe nanomaterials in ionic liquids as well as the effect of the IL 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [BMIm][NTf 2 ] on particle shape and size compared to TOPstabilized nanoparticles.…”