Abstract
In this study, [Pb((SePiPr2)2N)(S2CNHexMe)], a novel complex, was synthesised by refluxing [Pb(S2CNHexMe)2] and [Pb((SePiPr2)2N)2] complexes for 2 hours in chloroform and precipitating with methanol. The microelemental analysis, FT‐IR, and NMR spectroscopies were performed on the complex and the melting point was determined. The crystal structure of this new compound has been determined. The structure showed a distorted square pyramidal geometry with 2 sulphur and 2 selenium atoms coordinating the central atom at the base of the pyramid and a lone pair occupying the axial position of the lead atom. The complex was used to deposit lead chalcogenide thin films by the aerosol‐assisted chemical vapour deposition (AACVD) method at 300, 350, 400, and 450°C. The thin films matched with the powder X‐ray diffraction (pXRD) pattern for cubic PbSe with a (200) preferred orientation at all the deposition temperatures. The scanning electron microscopy (SEM) and energy dispersive X‐ray spectroscopy (EDAX) indicated that cubic PbSe crystals were formed.
Highlights
Lead chalcogenide nanocrystals and thin films have been studied widely for their applications in solar cells because of their large Bohr exciton radii (PbS 18 nm, PbSe 47 nm, and PbTe 46 nm) [1,2,3,4,5].When the nanocrystals have sizes that are about a tenth of the bulk material’s Bohr exciton diameter, the electrons and holes can move within a thin organic film, which facilitates the transportation of charges between nanocrystals due to strong electronic coupling [4, 6,7,8,9]
Nanocrystalline semiconductor alloys give an alternative route to quantum confinement effects and bandgap tuning and produce new materials with unique properties [29, 30]. e variable composition of alloys makes bandgap tuning possible while maintaining their size. e single-source precursor route to the synthesis of semiconducting nanoparticles and thin films is preferred over the dual and multisources because they are cleaner and less toxic and have the right stoichiometry because of the existing bonds in the single-source precursor [1, 28]
Mettler Toledo TGA/DSC analyser was used for the thermogravimetric analysis (TGA) under nitrogen from 30–600°C at a heating rate of 10°C min−1. e powder X-ray diffraction analysis was performed on a Bruker AXS D8 diffractometer with Cu-Kα radiation (λ 1.5418 A )
Summary
Lead chalcogenide nanocrystals and thin films have been studied widely for their applications in solar cells because of their large Bohr exciton radii (PbS 18 nm, PbSe 47 nm, and PbTe 46 nm) [1,2,3,4,5].When the nanocrystals have sizes that are about a tenth of the bulk material’s Bohr exciton diameter, the electrons and holes can move within a thin organic film, which facilitates the transportation of charges between nanocrystals due to strong electronic coupling [4, 6,7,8,9]. Lead chalcogenide nanocrystals and thin films have been studied widely for their applications in solar cells because of their large Bohr exciton radii (PbS 18 nm, PbSe 47 nm, and PbTe 46 nm) [1,2,3,4,5]. PbSxSe1−x as a ternary alloy could potentially lead to better-engineered particles to optimize both voltage and carrier transport simultaneously [17]. Ternary lead sulphide selenide (PbSxSe1−x) nanocrystals and thin films [4, 18,19,20] have not been studied extensively relative to PbS and PbSe [21,22,23,24,25,26,27,28]. In the AACVD method, the precursor is dissolved in a suitable solvent and carried as an aerosol by means of an ultrasonic humidifier with an inert carrier
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