In Vitro Polarized Resonance Raman Study of N719 and N719-TBP in Dye Sensitized Solar Cells

Søren Hassing, Kit Drescher Jernshøj, Phuong Tuyet Nguyen, Torben Lund

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Resumé

Abstract: The working efficiency of dye-sensitized solar cells (DSCs) depends on the long-term stability of the dye itself
and on the microscopic structure of the dye-semiconductor interface. Previous experimental studies of DSCs based on
ruthenium dye with bipyridine ligands (N719) adsorbed to the TiO2substrate applied FTIR,un-polarized Raman (RS) and
un-polarized resonance Raman (RRS) spectroscopy. In the un-polarized RRS studies of N719/TiO2 – DSCs the
discussion of the adsorption of N719 was based on the rather weak carbonyl or carboxyl group stretching vibrations and
on minor spectral changes of overlapping Raman modes, whereas conclusions about the dye-stability was based on the
observation that fresh and aged DSCs had almost identical RRS spectra.
In the present paper we address the problems mentioned above, by utilizing the unique property of Raman scattering
that the polarization of the scattered light is generally different from the polarization of the laser light. When the excitation
is chosen within the visible absorption band of N719 only the skeleton ring-modes in N719 are enhanced and are
observed as the most intense bands in the RRS spectra. We demonstrate by experimental results on N719/TiO2 – DSCs
that by combining an analysis of the wave number dependent polarization of these modes with the small shifts observed
in the visible absorption spectra of adsorbed, non-adsorbed molecules and degradation products new and more reliable
information about dye stability and about the adsorption of the dye on TiO2 can be obtained. Furthermore it is found that
the polarization fluorescence anisotropy is very different for adsorbed and non-adsorbed dye molecules. This information
is automatically obtained when processing the Raman data. The conclusion is that if the polarization properties of the
resonance Raman spectra are analyzed instead of just analyzing the minute spectral changes of the (weaker) Raman
bands the potential of RRS as an on-site tool for investigation of DSCs can be greatly improved.
OriginalsprogEngelsk
TidsskriftJournal of Technology Innovations in Renewable Energy
Udgave nummer5
Sider (fra-til)21-32
ISSN1929-6002
DOI
StatusUdgivet - 2. mar. 2016

Citer dette

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abstract = "Abstract: The working efficiency of dye-sensitized solar cells (DSCs) depends on the long-term stability of the dye itselfand on the microscopic structure of the dye-semiconductor interface. Previous experimental studies of DSCs based onruthenium dye with bipyridine ligands (N719) adsorbed to the TiO2substrate applied FTIR,un-polarized Raman (RS) andun-polarized resonance Raman (RRS) spectroscopy. In the un-polarized RRS studies of N719/TiO2 – DSCs thediscussion of the adsorption of N719 was based on the rather weak carbonyl or carboxyl group stretching vibrations andon minor spectral changes of overlapping Raman modes, whereas conclusions about the dye-stability was based on theobservation that fresh and aged DSCs had almost identical RRS spectra.In the present paper we address the problems mentioned above, by utilizing the unique property of Raman scatteringthat the polarization of the scattered light is generally different from the polarization of the laser light. When the excitationis chosen within the visible absorption band of N719 only the skeleton ring-modes in N719 are enhanced and areobserved as the most intense bands in the RRS spectra. We demonstrate by experimental results on N719/TiO2 – DSCsthat by combining an analysis of the wave number dependent polarization of these modes with the small shifts observedin the visible absorption spectra of adsorbed, non-adsorbed molecules and degradation products new and more reliableinformation about dye stability and about the adsorption of the dye on TiO2 can be obtained. Furthermore it is found thatthe polarization fluorescence anisotropy is very different for adsorbed and non-adsorbed dye molecules. This informationis automatically obtained when processing the Raman data. The conclusion is that if the polarization properties of theresonance Raman spectra are analyzed instead of just analyzing the minute spectral changes of the (weaker) Ramanbands the potential of RRS as an on-site tool for investigation of DSCs can be greatly improved.",
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In Vitro Polarized Resonance Raman Study of N719 and N719-TBP in Dye Sensitized Solar Cells. / Hassing, Søren; Jernshøj, Kit Drescher; Nguyen, Phuong Tuyet; Lund, Torben.

I: Journal of Technology Innovations in Renewable Energy, Nr. 5, 02.03.2016, s. 21-32.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - In Vitro Polarized Resonance Raman Study of N719 and N719-TBP in Dye Sensitized Solar Cells

AU - Hassing, Søren

AU - Jernshøj, Kit Drescher

AU - Nguyen, Phuong Tuyet

AU - Lund, Torben

PY - 2016/3/2

Y1 - 2016/3/2

N2 - Abstract: The working efficiency of dye-sensitized solar cells (DSCs) depends on the long-term stability of the dye itselfand on the microscopic structure of the dye-semiconductor interface. Previous experimental studies of DSCs based onruthenium dye with bipyridine ligands (N719) adsorbed to the TiO2substrate applied FTIR,un-polarized Raman (RS) andun-polarized resonance Raman (RRS) spectroscopy. In the un-polarized RRS studies of N719/TiO2 – DSCs thediscussion of the adsorption of N719 was based on the rather weak carbonyl or carboxyl group stretching vibrations andon minor spectral changes of overlapping Raman modes, whereas conclusions about the dye-stability was based on theobservation that fresh and aged DSCs had almost identical RRS spectra.In the present paper we address the problems mentioned above, by utilizing the unique property of Raman scatteringthat the polarization of the scattered light is generally different from the polarization of the laser light. When the excitationis chosen within the visible absorption band of N719 only the skeleton ring-modes in N719 are enhanced and areobserved as the most intense bands in the RRS spectra. We demonstrate by experimental results on N719/TiO2 – DSCsthat by combining an analysis of the wave number dependent polarization of these modes with the small shifts observedin the visible absorption spectra of adsorbed, non-adsorbed molecules and degradation products new and more reliableinformation about dye stability and about the adsorption of the dye on TiO2 can be obtained. Furthermore it is found thatthe polarization fluorescence anisotropy is very different for adsorbed and non-adsorbed dye molecules. This informationis automatically obtained when processing the Raman data. The conclusion is that if the polarization properties of theresonance Raman spectra are analyzed instead of just analyzing the minute spectral changes of the (weaker) Ramanbands the potential of RRS as an on-site tool for investigation of DSCs can be greatly improved.

AB - Abstract: The working efficiency of dye-sensitized solar cells (DSCs) depends on the long-term stability of the dye itselfand on the microscopic structure of the dye-semiconductor interface. Previous experimental studies of DSCs based onruthenium dye with bipyridine ligands (N719) adsorbed to the TiO2substrate applied FTIR,un-polarized Raman (RS) andun-polarized resonance Raman (RRS) spectroscopy. In the un-polarized RRS studies of N719/TiO2 – DSCs thediscussion of the adsorption of N719 was based on the rather weak carbonyl or carboxyl group stretching vibrations andon minor spectral changes of overlapping Raman modes, whereas conclusions about the dye-stability was based on theobservation that fresh and aged DSCs had almost identical RRS spectra.In the present paper we address the problems mentioned above, by utilizing the unique property of Raman scatteringthat the polarization of the scattered light is generally different from the polarization of the laser light. When the excitationis chosen within the visible absorption band of N719 only the skeleton ring-modes in N719 are enhanced and areobserved as the most intense bands in the RRS spectra. We demonstrate by experimental results on N719/TiO2 – DSCsthat by combining an analysis of the wave number dependent polarization of these modes with the small shifts observedin the visible absorption spectra of adsorbed, non-adsorbed molecules and degradation products new and more reliableinformation about dye stability and about the adsorption of the dye on TiO2 can be obtained. Furthermore it is found thatthe polarization fluorescence anisotropy is very different for adsorbed and non-adsorbed dye molecules. This informationis automatically obtained when processing the Raman data. The conclusion is that if the polarization properties of theresonance Raman spectra are analyzed instead of just analyzing the minute spectral changes of the (weaker) Ramanbands the potential of RRS as an on-site tool for investigation of DSCs can be greatly improved.

U2 - 10.6000/1929-6002.2016.05.01.4

DO - 10.6000/1929-6002.2016.05.01.4

M3 - Journal article

SP - 21

EP - 32

JO - Journal of Technology Innovations in Renewable Energy

JF - Journal of Technology Innovations in Renewable Energy

SN - 1929-6002

IS - 5

ER -