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Electrodeposition of lead selenide films from ionic liquids based on choline chloride
摘要： The paper presents some experimental results regarding the electrodeposition of PbSe thin films at 70 oC from two choline chloride (ChCl) based ionic liquids containing PbCl2 and SeO2 as precursors in choline chloride-ethylene glycol (ILEG) and choline chloride-urea (IL) eutectic mixtures. In this article we will detail our investigation of cathodic processes involved during the electrodeposition of binary semiconductor compound, PbSe as well as of singular Pb and Se elements. The cathodic branches of the recorded cyclic voltammograms in the cases of ionic liquids containing both Pb2+ + Se4+ show successively the Se underpotential deposition, Se bulk deposition and Pb deposition followed by a formation of PbSe semiconductor compound. However, at the most negative potentials the Se content of final layers decreases by a partial electrochemical dissolution of Se which reduces to Se2- soluble species. PbSe thin films have been electrodeposited on copper or nickel substrates under potentiostatic control at 70 oC for 0.5-4 h. The adherent and uniform deposits were characterized by SEM-EDX and XRD techniques. SEM images have shown adherent and grey deposits with uniform morphology and cubic PbSe crystals. A stoichiometry of around Pb1.1Se was indicated by EDX elemental analysis. XRD confirmed the formation of PbSe compound, showing a nanocrystalline structure, with crystallites average sizes in the range of 10-35 nm.
关键词： DES ionic liquids,electrodeposition,selenide semiconductors,Lead selenide,cyclic voltammetry
更新于2025-09-23 15:23:52
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[IEEE 2017 International Conference on Electron Devices and Solid-State Circuits (EDSSC) - Hsinchu (2017.10.18-2017.10.20)] 2017 International Conference on Electron Devices and Solid-State Circuits (EDSSC) - Influence of sensitization on the surface properties of PbSe thin films
摘要： This report focuses on the surface properties of sensitized polycrystalline lead selenide (PbSe) thin films that could significantly affect the final performance of photoconductive devices. By characterization the element chemical state and the current distribution along with the relevant morphologies at surface of sensitized and original PbSe films, it is confirmed that after sensitization surface properties, as well as the performance of photoconductive devices have been significantly modified. The mechanism was also discussed.
关键词： surface properties,lead selenide,photoconductive,sensitization
更新于2025-09-23 15:23:52
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Numerical simulation of PbSe quantum dots doped fiber ring laser with 1.7 <i>?μ</i> m wavelength
摘要： A lead selenide quantum dot-doped fiber ring laser operating at 1.7 μm wavelength is proposed and investigated by numerical simulation for the first time. Its temporal and spectral characteristics under different simulation parameters are presented. The fact that the obtained temporal profiles using different simulation parameters are largely different is observed and analyzed. These results offer us a new practical path to generate a 1.7 μm continuous-wave and pulsed laser for deep biomedical application.
关键词： fibre laser,1.7 μm wavelength,lead selenide (PbSe) quantum dot
更新于2025-09-23 15:19:57
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Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals
摘要： Lead selenide quantum dots (QDs) are low-bandgap IV-VI semiconducting nanomaterials that have been studied for a variety of applications. Their preparation using colloidal methods can create small spherical to larger cubic nanocrystals, with an upper limit of ～17 nm reported to date. Here we describe methods for preparing cubic PbSe nanocrystals over a 20–40 nm size range using a two-step procedure. Specifically, ～10 nm PbSe QDs are generated using the rapid injection method, the products from which are overcoated with additional lead and selenium precursors. The use of two lead reagents were studied; lead oleate resulted in a maximum of 20 nm cubes, while more reactive lead hexyldecanoate resulted in much larger nanomaterials with bulk bandgaps. However, PbSe samples prepared with lead hexyldecanoate also contained agglomerates. Special care must be taken when characterizing larger strained nanomaterials with X-ray powder diffraction, for which the Scherrer equation is inadequate. A more rigorous approach using the Williamson–Hall method provides characterizations that are consistent with electron microscopy analysis.
关键词： lead selenide,nanomaterials,conductivity,semiconductor,quantum dots
更新于2025-09-19 17:15:36