Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 3, Issue 10, Pages 1573-1579Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ee00083c
Keywords
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Funding
- UK EPSRC Materials for Energy [EP/E035175/1]
- European Union [212792]
- EPSRC [EP/E035175/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E035175/1] Funding Source: researchfish
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In this study, the injection efficiencies and photovoltaic device performances for two different phthalocyanine sensitisers-a Zn(II) Pc (TT-1) and a Ru(II) Pc (TT-35) in dye sensitized photoelectrochemical solar cells were compared. These dyes have similar structures and energetics, but differ significantly in their photophysics, with TT-1 exhibiting a reasonably long lived singlet state, whilst TT-35 exhibits rapid intersystem crossing to a long lived triplet state. Time correlated single photon counting (TCSPC) approach and incident photon conversion efficiency (IPCE) measurements were applied to study the injection efficiency of these two Pc dyes. A comparison of the injection efficiency determined by the two independent techniques, TCSPC and IPCE analysis, shows a good agreement. TT-35 shows higher injection efficiency in comparison to TT-1. This result is consistent with the relative energy and lifetime of the TT-35 triplet state compared to the TT-1 singlet excited state. The high injection efficiency and the long electron diffusion length shown by TT-35 make this dye an interesting red absorbing sensitizer for dye solar cells.
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