Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells

Jiajia Gao, Wenxing Yang, Ahmed El-Zohry, Govin K. Prajapati, Yuan Fang, Jing Dai, Yan Hao, Valentina Leandri, Per Svensson, Istvan Furo, Gerrit Boschloo, Torben Lund, Lars Kloo

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Lithium-ion-free tris(2,2’-bipyridine) Co(II/III)-mediated electrolytes have previously been proposed for long-term stable dye-sensitized solar cells (DSSCs). Such redox system also offers an impressive DSSC performance improvement under light soaking exposure, manifested by an increase in photocurrent and fill factor without the expense of decreasing photovoltage. Kinetic studies show that charge transfer and ion diffusion at the electrode/electrolyte interface are improved due to the light exposure. Control experiments reveal that the light effect is unambigously associated with electrolyte components, [Co(bpy)3]3+ and the Lewis-base additive tert-butylpyridine (TBP). Electrochemical and spectroscopic investigation of the [Co(bpy)3]3+/TBP mixtures points out that the presence of TBP, which retards the electrolyte diffusion, however causes an irreversbile redox reaction of [Co(bpy)3]3+ upon light exposure that improves the overall conductivity. This discovery not only provides a new strategy to mitigate the typical Jsc-Voc trade-off in Co(II/III)-mediated DSSCs but also highlights the importance of investigating the photochemistry of a photoelectrochemical system.
OriginalsprogEngelsk
TidsskriftJournal of Materials Chemistry A
Vol/bind2019
Udgave nummer33
Sider (fra-til)19495-19505
Antal sider11
ISSN2050-7488
DOI
StatusUdgivet - 1 aug. 2019

Citer dette

Gao, J., Yang, W., El-Zohry, A., Prajapati, G. K., Fang, Y., Dai, J., ... Kloo, L. (2019). Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells. Journal of Materials Chemistry A, 2019(33), 19495-19505. https://doi.org/10.1039/C9TA07198A
Gao, Jiajia ; Yang, Wenxing ; El-Zohry, Ahmed ; Prajapati, Govin K. ; Fang, Yuan ; Dai, Jing ; Hao, Yan ; Leandri, Valentina ; Svensson, Per ; Furo, Istvan ; Boschloo, Gerrit ; Lund, Torben ; Kloo, Lars. / Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells. I: Journal of Materials Chemistry A. 2019 ; Bind 2019, Nr. 33. s. 19495-19505.
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title = "Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells",
abstract = "Lithium-ion-free tris(2,2′-bipyridine) Co(II/III)-mediated electrolytes have previously been proposed for long-term stable dye-sensitized solar cells (DSSCs). Such redox systems also offer an impressive DSSC performance improvement under light soaking exposure, manifested by an increase in photocurrent and fill factor without the expense of decreasing photovoltage. Kinetic studies show that charge transfer and ion diffusion at the electrode/electrolyte interface are improved due to the light exposure. Control experiments reveal that the light effect is unambiguously associated with electrolyte components, [Co(bpy)3]3+ and the Lewis-base additive tert-butylpyridine (TBP). Electrochemical and spectroscopic investigation of the [Co(bpy)3]3+/TBP mixtures points out that the presence of TBP, which retards the electrolyte diffusion, however causes an irreversible redox reaction of [Co(bpy)3]3+ upon light exposure that improves the overall conductivity. This discovery not only provides a new strategy to mitigate the typical Jsc–Voc trade-off in Co(II/III)-mediated DSSCs but also highlights the importance of investigating the photochemistry of a photoelectrochemical system.",
author = "Jiajia Gao and Wenxing Yang and Ahmed El-Zohry and Prajapati, {Govin K.} and Yuan Fang and Jing Dai and Yan Hao and Valentina Leandri and Per Svensson and Istvan Furo and Gerrit Boschloo and Torben Lund and Lars Kloo",
year = "2019",
month = "8",
day = "1",
doi = "10.1039/C9TA07198A",
language = "English",
volume = "2019",
pages = "19495--19505",
journal = "Journal of Materials Chemistry A",
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Gao, J, Yang, W, El-Zohry, A, Prajapati, GK, Fang, Y, Dai, J, Hao, Y, Leandri, V, Svensson, P, Furo, I, Boschloo, G, Lund, T & Kloo, L 2019, 'Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells', Journal of Materials Chemistry A, bind 2019, nr. 33, s. 19495-19505. https://doi.org/10.1039/C9TA07198A

Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells. / Gao, Jiajia; Yang, Wenxing; El-Zohry, Ahmed; Prajapati, Govin K.; Fang, Yuan; Dai, Jing; Hao, Yan; Leandri, Valentina; Svensson, Per; Furo, Istvan; Boschloo, Gerrit; Lund, Torben; Kloo, Lars.

I: Journal of Materials Chemistry A, Bind 2019, Nr. 33, 01.08.2019, s. 19495-19505.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Light-induced electrolyte improvement in cobalt tris(bipyridine)-mediated dye-sensitized solar cells

AU - Gao, Jiajia

AU - Yang, Wenxing

AU - El-Zohry, Ahmed

AU - Prajapati, Govin K.

AU - Fang, Yuan

AU - Dai, Jing

AU - Hao, Yan

AU - Leandri, Valentina

AU - Svensson, Per

AU - Furo, Istvan

AU - Boschloo, Gerrit

AU - Lund, Torben

AU - Kloo, Lars

PY - 2019/8/1

Y1 - 2019/8/1

N2 - Lithium-ion-free tris(2,2′-bipyridine) Co(II/III)-mediated electrolytes have previously been proposed for long-term stable dye-sensitized solar cells (DSSCs). Such redox systems also offer an impressive DSSC performance improvement under light soaking exposure, manifested by an increase in photocurrent and fill factor without the expense of decreasing photovoltage. Kinetic studies show that charge transfer and ion diffusion at the electrode/electrolyte interface are improved due to the light exposure. Control experiments reveal that the light effect is unambiguously associated with electrolyte components, [Co(bpy)3]3+ and the Lewis-base additive tert-butylpyridine (TBP). Electrochemical and spectroscopic investigation of the [Co(bpy)3]3+/TBP mixtures points out that the presence of TBP, which retards the electrolyte diffusion, however causes an irreversible redox reaction of [Co(bpy)3]3+ upon light exposure that improves the overall conductivity. This discovery not only provides a new strategy to mitigate the typical Jsc–Voc trade-off in Co(II/III)-mediated DSSCs but also highlights the importance of investigating the photochemistry of a photoelectrochemical system.

AB - Lithium-ion-free tris(2,2′-bipyridine) Co(II/III)-mediated electrolytes have previously been proposed for long-term stable dye-sensitized solar cells (DSSCs). Such redox systems also offer an impressive DSSC performance improvement under light soaking exposure, manifested by an increase in photocurrent and fill factor without the expense of decreasing photovoltage. Kinetic studies show that charge transfer and ion diffusion at the electrode/electrolyte interface are improved due to the light exposure. Control experiments reveal that the light effect is unambiguously associated with electrolyte components, [Co(bpy)3]3+ and the Lewis-base additive tert-butylpyridine (TBP). Electrochemical and spectroscopic investigation of the [Co(bpy)3]3+/TBP mixtures points out that the presence of TBP, which retards the electrolyte diffusion, however causes an irreversible redox reaction of [Co(bpy)3]3+ upon light exposure that improves the overall conductivity. This discovery not only provides a new strategy to mitigate the typical Jsc–Voc trade-off in Co(II/III)-mediated DSSCs but also highlights the importance of investigating the photochemistry of a photoelectrochemical system.

U2 - 10.1039/C9TA07198A

DO - 10.1039/C9TA07198A

M3 - Journal article

VL - 2019

SP - 19495

EP - 19505

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

SN - 2050-7488

IS - 33

ER -