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The effect of the metal and selenium precursors on the properties of NbSe 2 and Nb 2 Se 9 nanostructures and their application in dye-sensitized solar cells
Ist Teil von
RSC advances, 2021-09, Vol.11 (50), p.31159-31173
Ort / Verlag
England
Erscheinungsjahr
2021
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Herein, we report on the effect of the precursors on the structural, morphological, and optical properties of niobium selenide using the heat-up colloidal method. The metal precursor was varied from the conventional NbCl
to NbF
whilst Se, SeO
, and selenourea were used as the selenium precursors. The NbCl
and NbF
resulted in the formation of NbSe
and Nb
Se
respectively. While maintaining the two different metal precursors and varying the selenium precursor from Se, SeO
to selenourea, the properties of NbSe
and Nb
Se
changed slightly, however the effect of changing the selenium precursor was less pronounced than changing the metal precursors. From the XRD and XPS, the NbSe
nanostructures were more susceptible to oxidation than Nb
Se
as Nb
O
was observed in the XRD and the percentage of M-O in the XPS was much higher in NbSe
. NbSe
formed nanoflowers whilst Nb
Se
formed rods with 3.29 eV and 2.43 eV band-gaps, respectively. Also, the band-gaps were red-shifted as the selenium precursors were varied. The NbSe
nanoflowers and Nb
Se
nanorods were used as counter electrodes in dye-sensitized solar cells. Two methods were used to fabricate the counter electrodes
spin coating and drop casting. The electrochemical properties of the spin coated counter electrodes were better than the drop casted ones; hence, they were employed in dye-sensitized solar cells. The spin coated NbSe
nanoflowers had the highest efficiency of 6.84%, attributed to the nanoflower morphology.
Sprache
Englisch
Identifikatoren
ISSN: 2046-2069
eISSN: 2046-2069
DOI: 10.1039/D0RA10894D
Titel-ID: cdi_crossref_primary_10_1039_D0RA10894D
Format
–
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