Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
1,1′-Bis(diphenylphosphino)ferrocene-appended nickel( ii ) dithiolates as sensitizers in dye-sensitized solar cells
Ist Teil von
New journal of chemistry, 2018, Vol.42 (11), p.9306-9316
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Herein, two new Ni(dppf)dithiolates in which dithiolate ligands comprise 2,2-diacetyl (
D-1
) and 2-nitro (
D-2
) anchors have been synthesized and characterized using microanalyses, FTIR,
1
H and
13
C NMR spectroscopy, as well as single-crystal X-ray diffraction. The X-ray crystallographic studies indicate that in both compounds, the geometry around the Ni(
ii
) center can be described as distorted square planar, which is defined by the two sulfur centers of the dinegative dithiolate ligands and two phosphorus centers of the neutral dppf ligand. The electronic absorption spectra for both sensitizers display a blue shift when compared with the characteristic electronic absorption spectrum of the dppf ligand in a similar wavelength region. The photovoltaic performances and charge transport properties (EIS spectra) were studied to evaluate the performance of the synthesized dye in DSSCs. Upon comparing both dyes, it was found that the dye with the nitro anchor (
D-2
) showed better photovoltaic performance than the dye with the ketonic anchor (
D-1
). The superior performance of
D-2
suggests better anchorage and superior dye loading capability on the TiO
2
surface, which suppresses charge recombination, prolongs electron lifetime, and decreases the total resistance of DSSCs. The assembly fabricated using
D-2
showed best performance with an overall conversion efficiency,
η
, of 3.21%,
J
sc
of 7.96 mA cm
−2
, and
V
oc
of −0.654 V. The obtained efficiency is ∼46% that of today's state-of-the-art
N719
dye under similar conditions. The probable reasons for the poor performance of both dyes have been addressed with the help of theoretical calculations.