Journal
DALTON TRANSACTIONS
Volume 42, Issue 30, Pages 10919-10928Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt50781e
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Funding
- High-Impact Research scheme [UM.C/625/1/HIR/131]
- UMRG scheme [UM.TNC2/RC/261/1/1/RP007-13AET]
- UK EPSRC
- Johnson Matthey Plc
- EPSRC [EP/F057342/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F057342/1] Funding Source: researchfish
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Symmetrical and unsymmetrical dithiocarbamato pyridine solvated and non-solvated complexes of indium(III) with the general formula [In(S2CNRR')(3)]center dot n(py) [where py = pyridine; R, R' = Cy, n = 2 (1); R, R' = Pr-i, n = 1.5 (2); NRR' = Pip, n = 0.5 (3) and R = Bz, R' = Me, n = 0 (4)] have been synthesized. The compositions, structures and properties of these complexes have been studied by means of microanalysis, IR and H-1-NMR spectroscopy, X-ray single crystal and thermogravimetric (TG/DTG) analyses. The applicability of these complexes as single source precursors (SSPs) for the deposition of beta-In2S3 thin films on fluorine-doped SnO2 (FTO) coated conducting glass substrates by aerosol-assisted chemical vapour deposition (AACVD) at temperatures of 300, 350 and 400 degrees C is studied. All films have been characterized by powder X-ray diffraction (PXRD) and energy dispersive X-ray analysis (EDX) for the detection of phase and stoichiometry of the deposit. Scanning electron microscopy (SEM) studies reveal that precursors (1)-(4), irrespective of different metal ligand design, generate comparable morphologies of beta-In2S3 thin films at different temperatures. Direct band gap energies of 2.2 eV have been estimated from the UV-vis spectroscopy for the beta-In2S3 films fabricated from precursors (1) and (4). The photoelectrochemical (PEC) properties of beta-In2S3 were confirmed by recording the current-voltage plots under light and dark conditions. The plots showed anodic photocurrent densities of 1.25 and 0.65 mA cm(-2) at 0.23 V vs. Ag/AgCl for the beta-In2S3 films made at 400 and 350 degrees C from the precursors (1) and (4), respectively. The photoelectrochemical performance indicates that the newly synthesised precursors are highly useful in fabricating beta-In2S3 electrodes for solar energy harvesting and optoelectronic application.
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