Dye-sensitized solar cells using fluorone-based ionic liquids with improved cell efficiency

Research output: Contribution to journalArticle

Abstract

Six trihexyltetradecylphosphonium chloride (P6,6,6,14Cl) based ionic liquids (IL) with dianionic fluorone derivatives were synthesized with total exchange of chloride from the dianionic dye: Fluorescein (a), Rose Bengal (b), Phloxine B (c), Eosin B (d), Eosin Y (e) and Erythrosin B (f). Spectroscopic characterization of these viscous salts indicated the presence of the expected 1 or 2 strong absorption bands. A total of 12 compounds, as sodium (from a to f) or as trihexyltetradecylphosphonium dianion salts (from a′ to f′), were used for sensitization of nanocrystalline TiO2. Here, we report the sensitization activity of these metal free dyes in terms of current-potential curve, open-circuit potential, fill factor, and overall solar energy conversion efficiency which have been evaluated under 100 mW cm-2 light intensity. We developed a strategy to improve the light harvesting of these conventional dyes by simple cationic exchange which was accompanied by a minimum of 30% increase in the cell photovoltaic conversion efficiency. Also, for Eosin B the binding to TiO2 apparently allows reduction of the-NO2 electron-withdrawing group to-NO22-. This provides a new interaction between the reduced nitro group and the TiO2 surface, reflecting an improvement in the overall DSSC performance reaching its maximum of 0.65% efficiency after light DSSC soaking. Factors that improve DSSC performance like aggregate inhibition, increment of the electrode's quasi-Fermi level and slight red shift in the absorption spectra of the tested anionic dyes were achieved by simple cationic exchange.

Original languageEnglish
Pages (from-to)3510-3517
Number of pages8
JournalSustainable Energy and Fuels
Volume3
Issue number12
DOIs
Publication statusPublished - 1 Jan 2019

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Ionic liquids
Dyes
Conversion efficiency
Absorption spectra
Salts
Photovoltaic cells
Fermi level
Energy conversion
Solar energy
Sodium
Derivatives
Electrodes
Dye-sensitized solar cells
Electrons
Networks (circuits)
Metals

Cite this

@article{0a55fba14da6483fb15e9079be47bbad,
title = "Dye-sensitized solar cells using fluorone-based ionic liquids with improved cell efficiency",
abstract = "Six trihexyltetradecylphosphonium chloride (P6,6,6,14Cl) based ionic liquids (IL) with dianionic fluorone derivatives were synthesized with total exchange of chloride from the dianionic dye: Fluorescein (a), Rose Bengal (b), Phloxine B (c), Eosin B (d), Eosin Y (e) and Erythrosin B (f). Spectroscopic characterization of these viscous salts indicated the presence of the expected 1 or 2 strong absorption bands. A total of 12 compounds, as sodium (from a to f) or as trihexyltetradecylphosphonium dianion salts (from a′ to f′), were used for sensitization of nanocrystalline TiO2. Here, we report the sensitization activity of these metal free dyes in terms of current-potential curve, open-circuit potential, fill factor, and overall solar energy conversion efficiency which have been evaluated under 100 mW cm-2 light intensity. We developed a strategy to improve the light harvesting of these conventional dyes by simple cationic exchange which was accompanied by a minimum of 30{\%} increase in the cell photovoltaic conversion efficiency. Also, for Eosin B the binding to TiO2 apparently allows reduction of the-NO2 electron-withdrawing group to-NO22-. This provides a new interaction between the reduced nitro group and the TiO2 surface, reflecting an improvement in the overall DSSC performance reaching its maximum of 0.65{\%} efficiency after light DSSC soaking. Factors that improve DSSC performance like aggregate inhibition, increment of the electrode's quasi-Fermi level and slight red shift in the absorption spectra of the tested anionic dyes were achieved by simple cationic exchange.",
author = "Pinto, {Ana L.} and Parola, {A. Jorge} and Leal, {Jo{\~a}o P.} and Coutinho, {Isabel B.} and Pereira, {Cla{\'u}dia C. L.}",
note = "This work was performed under the project {"}SunStorage- Harvesting and storage of solar energy{"}, with reference POCI-01-0145-FEDER-016387, funded by the European Regional Development Fund (ERDF), through COMPETE 2020 - Operational Programme for Competitiveness and Internationalization (OPCI), and by national funds, through FCT - Fundacao para a Ciencia e a Tecnologia I.P. This work was supported by the Associated Laboratory for Sustainable Chemistry-Clean Processes and Technologies - LAQV which is financed by national funds from FCT/MEC (UID/QUI/50006/2013) and co-financed by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007265). This work was supported by LAQV-REQUIMTE, which is financed by the Portuguese FCT/MEC (UID/QUI/50006/2019). The NMR spectrometers are part of The National NMR Facility, supported by the Fundacao para a Ciencia e a Tecnologia (RECI/BBB-BQB/0230/2012). Financial support from the Fundacao para a Ciencia e a Tecnologia and Portugal 2020 to the Portuguese Mass Spectrometry Network (LISBOA-01-0145-FEDER-402-022125) is acknowledged. Claudia Pereira and Isabel Borges Coutinho thank the Fundacao para a Ciencia e a Tecnologia for financing under the project PTDC/QUI-QUI/114236/2009. Claudia C. L. Pereira thanks the Fundacao para a Ciencia e a Tecnologia, MCTES, for the Norma transitoria DL 57/2016 Program Contract. Ana L. Pinto thanks Fundacao para a Ciencia e a Tecnologia under the fellowship SFRH/BD/135087/2017.",
year = "2019",
month = "1",
day = "1",
doi = "10.1039/c9se00783k",
language = "English",
volume = "3",
pages = "3510--3517",
journal = "Sustainable Energy and Fuels",
number = "12",

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TY - JOUR

T1 - Dye-sensitized solar cells using fluorone-based ionic liquids with improved cell efficiency

AU - Pinto, Ana L.

AU - Parola, A. Jorge

AU - Leal, João P.

AU - Coutinho, Isabel B.

AU - Pereira, Claúdia C. L.

N1 - This work was performed under the project "SunStorage- Harvesting and storage of solar energy", with reference POCI-01-0145-FEDER-016387, funded by the European Regional Development Fund (ERDF), through COMPETE 2020 - Operational Programme for Competitiveness and Internationalization (OPCI), and by national funds, through FCT - Fundacao para a Ciencia e a Tecnologia I.P. This work was supported by the Associated Laboratory for Sustainable Chemistry-Clean Processes and Technologies - LAQV which is financed by national funds from FCT/MEC (UID/QUI/50006/2013) and co-financed by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007265). This work was supported by LAQV-REQUIMTE, which is financed by the Portuguese FCT/MEC (UID/QUI/50006/2019). The NMR spectrometers are part of The National NMR Facility, supported by the Fundacao para a Ciencia e a Tecnologia (RECI/BBB-BQB/0230/2012). Financial support from the Fundacao para a Ciencia e a Tecnologia and Portugal 2020 to the Portuguese Mass Spectrometry Network (LISBOA-01-0145-FEDER-402-022125) is acknowledged. Claudia Pereira and Isabel Borges Coutinho thank the Fundacao para a Ciencia e a Tecnologia for financing under the project PTDC/QUI-QUI/114236/2009. Claudia C. L. Pereira thanks the Fundacao para a Ciencia e a Tecnologia, MCTES, for the Norma transitoria DL 57/2016 Program Contract. Ana L. Pinto thanks Fundacao para a Ciencia e a Tecnologia under the fellowship SFRH/BD/135087/2017.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Six trihexyltetradecylphosphonium chloride (P6,6,6,14Cl) based ionic liquids (IL) with dianionic fluorone derivatives were synthesized with total exchange of chloride from the dianionic dye: Fluorescein (a), Rose Bengal (b), Phloxine B (c), Eosin B (d), Eosin Y (e) and Erythrosin B (f). Spectroscopic characterization of these viscous salts indicated the presence of the expected 1 or 2 strong absorption bands. A total of 12 compounds, as sodium (from a to f) or as trihexyltetradecylphosphonium dianion salts (from a′ to f′), were used for sensitization of nanocrystalline TiO2. Here, we report the sensitization activity of these metal free dyes in terms of current-potential curve, open-circuit potential, fill factor, and overall solar energy conversion efficiency which have been evaluated under 100 mW cm-2 light intensity. We developed a strategy to improve the light harvesting of these conventional dyes by simple cationic exchange which was accompanied by a minimum of 30% increase in the cell photovoltaic conversion efficiency. Also, for Eosin B the binding to TiO2 apparently allows reduction of the-NO2 electron-withdrawing group to-NO22-. This provides a new interaction between the reduced nitro group and the TiO2 surface, reflecting an improvement in the overall DSSC performance reaching its maximum of 0.65% efficiency after light DSSC soaking. Factors that improve DSSC performance like aggregate inhibition, increment of the electrode's quasi-Fermi level and slight red shift in the absorption spectra of the tested anionic dyes were achieved by simple cationic exchange.

AB - Six trihexyltetradecylphosphonium chloride (P6,6,6,14Cl) based ionic liquids (IL) with dianionic fluorone derivatives were synthesized with total exchange of chloride from the dianionic dye: Fluorescein (a), Rose Bengal (b), Phloxine B (c), Eosin B (d), Eosin Y (e) and Erythrosin B (f). Spectroscopic characterization of these viscous salts indicated the presence of the expected 1 or 2 strong absorption bands. A total of 12 compounds, as sodium (from a to f) or as trihexyltetradecylphosphonium dianion salts (from a′ to f′), were used for sensitization of nanocrystalline TiO2. Here, we report the sensitization activity of these metal free dyes in terms of current-potential curve, open-circuit potential, fill factor, and overall solar energy conversion efficiency which have been evaluated under 100 mW cm-2 light intensity. We developed a strategy to improve the light harvesting of these conventional dyes by simple cationic exchange which was accompanied by a minimum of 30% increase in the cell photovoltaic conversion efficiency. Also, for Eosin B the binding to TiO2 apparently allows reduction of the-NO2 electron-withdrawing group to-NO22-. This provides a new interaction between the reduced nitro group and the TiO2 surface, reflecting an improvement in the overall DSSC performance reaching its maximum of 0.65% efficiency after light DSSC soaking. Factors that improve DSSC performance like aggregate inhibition, increment of the electrode's quasi-Fermi level and slight red shift in the absorption spectra of the tested anionic dyes were achieved by simple cationic exchange.

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U2 - 10.1039/c9se00783k

DO - 10.1039/c9se00783k

M3 - Article

VL - 3

SP - 3510

EP - 3517

JO - Sustainable Energy and Fuels

JF - Sustainable Energy and Fuels

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ER -