Resumé
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Journal of Materials Chemistry A |
| Vol/bind | 2019 |
| Udgave nummer | 33 |
| Sider (fra-til) | 19495-19505 |
| Antal sider | 11 |
| ISSN | 2050-7488 |
| DOI | |
| Status | Udgivet - 1 aug. 2019 |
Citer dette
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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 tidsskrift › Tidsskriftartikel › Forskning › peer 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 -