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Titel:
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Effect of TiO2-electrode properties on the efficiency of nanocrystalline dye-sensitized solar cells (nc-DSC)
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Auteur(s):
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Gepubliceerd door:
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Publicatie datum:
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ECN
Zonne-energie
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1997
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ECN publicatienummer:
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Publicatie type:
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ECN-RX--97-033
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Artikel wetenschap tijdschrift
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Aantal pagina's:
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6
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Gepubliceerd in: Paper, presented at the 14th European photovoltaic solar energy conference and exhibition, 30 June - 4 July, 1997, Barcelona, Sp (), , , Vol., p.-.
Samenvatting:
The influence of the TiO2-microstructure on the performance of the nc-DSCis investigated. Hence, four commercial TiO2-powders with different particle
diameters and sintering behaviour have been used: P25 (Degussa AG), H37
(Transcommerce International AG), AK1 and PK5585 (Bayer AG). With a view to
large-scale production the TiO2-electrode preparation process is changed by
substitution of the well known squeegee (doctor-blade ) method by the screen
print process. The TiO2-powders and electrodes are characterized by
BET-analysis, SEM and TEM, pore size distribution analysis (Hg-porosimetry),
X-ray diffraction, chemical (elemental) analysis and reflection- transmission
measurements. The microstructure of the electrodes, prepared from different
TiO2-powders differs significantly, but the cell efficiencies at 1sun of
AM1.5 solar light of the
glass/SnO2:F/TiO2/cis-(NCS)2-bis(4,4-dicarboxy-2,2-bipyridine)-ruthenium (II)
/electrolyte/SnO2:F(Pt)/ glass-cells were found to be comparable, implying
that additional factors limit the efficiency. In contrast, the change of the
paste composition influences the efficiencies expanding from 2.5% for
'screenprint paste' electrodes and 4.5% for 'squeegee paste' electrodes. No
micro-structural changes could be observed by SEM for different paste
composition. Hence, the different short circuit currents are probably caused
by particle interconnection problems or incorporation of foreign particles
during the preparation of the screenprint paste which definitely causes
trapping of charge carriers. 8 refs., 5 tabs., 3 refs.
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