Charge Transport and Photocurrent Generation Characteristics in Dye Solar Cells Containing Thermally Degraded N719 Dye Molecules

Anders Rand Andersen, Janne Halme, Torben Lund, Muhammad Imran Asghar, Nguyen Tuyet Phuong, Kati Miettunen, Erno Kemppainen, Ole Albrektsen

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Resumé

By deliberately introducing the thermally de-graded form of the dye solar cell sensitizer N719 in dye-ensitized solar cells (DSCs) using synthetically prepared
N719-TBP ([Ru(L-H)2(NCS)(4-tert-butylpyridine)]- +N-(Bu)4), we have investigated the devastating influence of this ligand substitution product (N719-TBP) on the performance parameters of the cells. Two types of dyed solar cells, based on either N719 or N719-TBP, have been characterized employing standard current-voltage (I-V) performance test, UV-vis optical spectroscopy, incident photon to current efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) methods. The performance tests show a drastic efficiency reduction of ∼50% in the N719-TBP containing cells as compared to N719-dyed cells. The lower performance of N719-TBP was caused by lower overall light harvesting efficiency due to ca. 30 nm blue shift in the absorption spectrum of the dye, ca. 50% shorter electron diffusion length due to lower electron recombination resistance, and ca. 14% lower charge separation efficiency, which most likely can be ascribed to decreased dye regeneration efficiency caused by the replacement of one NCS ligand with TBP in the substitution product. The observations made in this study of DSC cells dyed with the substitution product, representing a worst case scenario of cells with 100% degraded dye, are in agreement with the characteristics of N719-dyed solar cells degraded at 85 C, where the effect of ligand substitution is somewhat less pronounced.
OriginalsprogEngelsk
TidsskriftJournal of Physical Chemistry Part C: Nanomaterials and Interfaces
Vol/bind115
Udgave nummer31
Sider (fra-til)15598-15606
Antal sider9
ISSN1932-7447
DOI
StatusUdgivet - 2011

Emneord

  • Dye-sensitized solar cells

Citer dette

Andersen, Anders Rand ; Halme, Janne ; Lund, Torben ; Asghar, Muhammad Imran ; Phuong, Nguyen Tuyet ; Miettunen, Kati ; Kemppainen, Erno ; Albrektsen, Ole. / Charge Transport and Photocurrent Generation Characteristics in Dye Solar Cells Containing Thermally Degraded N719 Dye Molecules. I: Journal of Physical Chemistry Part C: Nanomaterials and Interfaces. 2011 ; Bind 115, Nr. 31. s. 15598-15606.
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title = "Charge Transport and Photocurrent Generation Characteristics in Dye Solar Cells Containing Thermally Degraded N719 Dye Molecules",
abstract = "By deliberately introducing the thermally de-graded form of the dye solar cell sensitizer N719 in dye-ensitized solar cells (DSCs) using synthetically prepared N719-TBP ([Ru(L-H)2(NCS)(4-tert-butylpyridine)]- +N-(Bu)4), we have investigated the devastating influence of this ligand substitution product (N719-TBP) on the performance parameters of the cells. Two types of dyed solar cells, based on either N719 or N719-TBP, have been characterized employing standard current-voltage (I-V) performance test, UV-vis optical spectroscopy, incident photon to current efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) methods. The performance tests show a drastic efficiency reduction of ∼50{\%} in the N719-TBP containing cells as compared to N719-dyed cells. The lower performance of N719-TBP was caused by lower overall light harvesting efficiency due to ca. 30 nm blue shift in the absorption spectrum of the dye, ca. 50{\%} shorter electron diffusion length due to lower electron recombination resistance, and ca. 14{\%} lower charge separation efficiency, which most likely can be ascribed to decreased dye regeneration efficiency caused by the replacement of one NCS ligand with TBP in the substitution product. The observations made in this study of DSC cells dyed with the substitution product, representing a worst case scenario of cells with 100{\%} degraded dye, are in agreement with the characteristics of N719-dyed solar cells degraded at 85 C, where the effect of ligand substitution is somewhat less pronounced.",
keywords = "Dye-sensitized solar cells",
author = "Andersen, {Anders Rand} and Janne Halme and Torben Lund and Asghar, {Muhammad Imran} and Phuong, {Nguyen Tuyet} and Kati Miettunen and Erno Kemppainen and Ole Albrektsen",
year = "2011",
doi = "10.1021/jp201658j",
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journal = "The Journal of Physical Chemistry Part C",
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Charge Transport and Photocurrent Generation Characteristics in Dye Solar Cells Containing Thermally Degraded N719 Dye Molecules. / Andersen, Anders Rand; Halme, Janne ; Lund, Torben; Asghar, Muhammad Imran; Phuong, Nguyen Tuyet; Miettunen, Kati; Kemppainen, Erno; Albrektsen, Ole.

I: Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, Bind 115, Nr. 31, 2011, s. 15598-15606.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Charge Transport and Photocurrent Generation Characteristics in Dye Solar Cells Containing Thermally Degraded N719 Dye Molecules

AU - Andersen, Anders Rand

AU - Halme, Janne

AU - Lund, Torben

AU - Asghar, Muhammad Imran

AU - Phuong, Nguyen Tuyet

AU - Miettunen, Kati

AU - Kemppainen, Erno

AU - Albrektsen, Ole

PY - 2011

Y1 - 2011

N2 - By deliberately introducing the thermally de-graded form of the dye solar cell sensitizer N719 in dye-ensitized solar cells (DSCs) using synthetically prepared N719-TBP ([Ru(L-H)2(NCS)(4-tert-butylpyridine)]- +N-(Bu)4), we have investigated the devastating influence of this ligand substitution product (N719-TBP) on the performance parameters of the cells. Two types of dyed solar cells, based on either N719 or N719-TBP, have been characterized employing standard current-voltage (I-V) performance test, UV-vis optical spectroscopy, incident photon to current efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) methods. The performance tests show a drastic efficiency reduction of ∼50% in the N719-TBP containing cells as compared to N719-dyed cells. The lower performance of N719-TBP was caused by lower overall light harvesting efficiency due to ca. 30 nm blue shift in the absorption spectrum of the dye, ca. 50% shorter electron diffusion length due to lower electron recombination resistance, and ca. 14% lower charge separation efficiency, which most likely can be ascribed to decreased dye regeneration efficiency caused by the replacement of one NCS ligand with TBP in the substitution product. The observations made in this study of DSC cells dyed with the substitution product, representing a worst case scenario of cells with 100% degraded dye, are in agreement with the characteristics of N719-dyed solar cells degraded at 85 C, where the effect of ligand substitution is somewhat less pronounced.

AB - By deliberately introducing the thermally de-graded form of the dye solar cell sensitizer N719 in dye-ensitized solar cells (DSCs) using synthetically prepared N719-TBP ([Ru(L-H)2(NCS)(4-tert-butylpyridine)]- +N-(Bu)4), we have investigated the devastating influence of this ligand substitution product (N719-TBP) on the performance parameters of the cells. Two types of dyed solar cells, based on either N719 or N719-TBP, have been characterized employing standard current-voltage (I-V) performance test, UV-vis optical spectroscopy, incident photon to current efficiency (IPCE), and electrochemical impedance spectroscopy (EIS) methods. The performance tests show a drastic efficiency reduction of ∼50% in the N719-TBP containing cells as compared to N719-dyed cells. The lower performance of N719-TBP was caused by lower overall light harvesting efficiency due to ca. 30 nm blue shift in the absorption spectrum of the dye, ca. 50% shorter electron diffusion length due to lower electron recombination resistance, and ca. 14% lower charge separation efficiency, which most likely can be ascribed to decreased dye regeneration efficiency caused by the replacement of one NCS ligand with TBP in the substitution product. The observations made in this study of DSC cells dyed with the substitution product, representing a worst case scenario of cells with 100% degraded dye, are in agreement with the characteristics of N719-dyed solar cells degraded at 85 C, where the effect of ligand substitution is somewhat less pronounced.

KW - Dye-sensitized solar cells

U2 - 10.1021/jp201658j

DO - 10.1021/jp201658j

M3 - Journal article

VL - 115

SP - 15598

EP - 15606

JO - The Journal of Physical Chemistry Part C

JF - The Journal of Physical Chemistry Part C

SN - 1932-7447

IS - 31

ER -