Characterization of metal free D- (-A)2 organic dye and its application as co-sensitizer along with N719 dye for efficient dye sensitized solar cells

M Singh, Rajnish Kurchania, Adam Pockett, Richard Ball, E Koukaras, Petra Cameron, G D Sharma

Research output: Contribution to journalArticle

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Abstract

The optical, electrochemical and density functional theory molecular simulation of a metal free D-(-A)2 i.e. 3,3'-(5,5'-(9-hexyl-9H-carbazole-3,6-diyl)bis(thiophene-5,2-diyl))bis(2-cyanoacrylic acid denoted as D) has been investigated. A step wise cosensitization of D with N719 dye is adopted to enhance the power conversion efficiency of dye sensitized solar cells. The metal free dye possesses strong absorption in the 370-450 nm wavelength range and effectively overcome the competitive light absorption by . The N719/D cosensitized dye sensitized solar cell shows a power conversion efficiency of about 7.24 % which is higher than the dye sensitized solar cells based on either N719 (5.78 %) or D (3.95 %) sensitizers. The improved power conversion efficiency of the co-sensitized dye sensitized solar cell is attributed to the
combined enhancement of both short circuit photocurrent and open circuit voltage. The short circuit photocurrent improvement is attributed to the increase in the both light harvesting efficiency of the cosensitized photoanode and charge collection efficiency of the dye sensitized solar cell. However, the open circuit voltage is improved due to better adsorption and surface coverage of TiO2 on cosensitization and an associated reduction in the back electron recombination with increased electron lifetime. These effects are analyzed using electrochemical impedance spectroscopy and dark current voltage measurements of the dye sensitized solar cells.
LanguageEnglish
JournalIndian Journal of Physics
Early online date10 Apr 2015
DOIs
StatusPublished - Apr 2015

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solar cells
dyes
metals
short circuits
open circuit voltage
photocurrents
electron recombination
carbazoles
electromagnetic absorption
thiophenes
dark current
electrical measurement
impedance
density functional theory
life (durability)
acids
adsorption
augmentation
wavelengths
spectroscopy

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Characterization of metal free D- (-A)2 organic dye and its application as co-sensitizer along with N719 dye for efficient dye sensitized solar cells. / Singh, M; Kurchania, Rajnish; Pockett, Adam; Ball, Richard; Koukaras, E; Cameron, Petra; Sharma, G D.

In: Indian Journal of Physics, 04.2015.

Research output: Contribution to journalArticle

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title = "Characterization of metal free D- (-A)2 organic dye and its application as co-sensitizer along with N719 dye for efficient dye sensitized solar cells",
abstract = "The optical, electrochemical and density functional theory molecular simulation of a metal free D-(-A)2 i.e. 3,3'-(5,5'-(9-hexyl-9H-carbazole-3,6-diyl)bis(thiophene-5,2-diyl))bis(2-cyanoacrylic acid denoted as D) has been investigated. A step wise cosensitization of D with N719 dye is adopted to enhance the power conversion efficiency of dye sensitized solar cells. The metal free dye possesses strong absorption in the 370-450 nm wavelength range and effectively overcome the competitive light absorption by . The N719/D cosensitized dye sensitized solar cell shows a power conversion efficiency of about 7.24 {\%} which is higher than the dye sensitized solar cells based on either N719 (5.78 {\%}) or D (3.95 {\%}) sensitizers. The improved power conversion efficiency of the co-sensitized dye sensitized solar cell is attributed to thecombined enhancement of both short circuit photocurrent and open circuit voltage. The short circuit photocurrent improvement is attributed to the increase in the both light harvesting efficiency of the cosensitized photoanode and charge collection efficiency of the dye sensitized solar cell. However, the open circuit voltage is improved due to better adsorption and surface coverage of TiO2 on cosensitization and an associated reduction in the back electron recombination with increased electron lifetime. These effects are analyzed using electrochemical impedance spectroscopy and dark current voltage measurements of the dye sensitized solar cells.",
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AU - Kurchania, Rajnish

AU - Pockett, Adam

AU - Ball, Richard

AU - Koukaras, E

AU - Cameron, Petra

AU - Sharma, G D

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N2 - The optical, electrochemical and density functional theory molecular simulation of a metal free D-(-A)2 i.e. 3,3'-(5,5'-(9-hexyl-9H-carbazole-3,6-diyl)bis(thiophene-5,2-diyl))bis(2-cyanoacrylic acid denoted as D) has been investigated. A step wise cosensitization of D with N719 dye is adopted to enhance the power conversion efficiency of dye sensitized solar cells. The metal free dye possesses strong absorption in the 370-450 nm wavelength range and effectively overcome the competitive light absorption by . The N719/D cosensitized dye sensitized solar cell shows a power conversion efficiency of about 7.24 % which is higher than the dye sensitized solar cells based on either N719 (5.78 %) or D (3.95 %) sensitizers. The improved power conversion efficiency of the co-sensitized dye sensitized solar cell is attributed to thecombined enhancement of both short circuit photocurrent and open circuit voltage. The short circuit photocurrent improvement is attributed to the increase in the both light harvesting efficiency of the cosensitized photoanode and charge collection efficiency of the dye sensitized solar cell. However, the open circuit voltage is improved due to better adsorption and surface coverage of TiO2 on cosensitization and an associated reduction in the back electron recombination with increased electron lifetime. These effects are analyzed using electrochemical impedance spectroscopy and dark current voltage measurements of the dye sensitized solar cells.

AB - The optical, electrochemical and density functional theory molecular simulation of a metal free D-(-A)2 i.e. 3,3'-(5,5'-(9-hexyl-9H-carbazole-3,6-diyl)bis(thiophene-5,2-diyl))bis(2-cyanoacrylic acid denoted as D) has been investigated. A step wise cosensitization of D with N719 dye is adopted to enhance the power conversion efficiency of dye sensitized solar cells. The metal free dye possesses strong absorption in the 370-450 nm wavelength range and effectively overcome the competitive light absorption by . The N719/D cosensitized dye sensitized solar cell shows a power conversion efficiency of about 7.24 % which is higher than the dye sensitized solar cells based on either N719 (5.78 %) or D (3.95 %) sensitizers. The improved power conversion efficiency of the co-sensitized dye sensitized solar cell is attributed to thecombined enhancement of both short circuit photocurrent and open circuit voltage. The short circuit photocurrent improvement is attributed to the increase in the both light harvesting efficiency of the cosensitized photoanode and charge collection efficiency of the dye sensitized solar cell. However, the open circuit voltage is improved due to better adsorption and surface coverage of TiO2 on cosensitization and an associated reduction in the back electron recombination with increased electron lifetime. These effects are analyzed using electrochemical impedance spectroscopy and dark current voltage measurements of the dye sensitized solar cells.

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