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Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods: Aggregation Effects

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Standard

Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods : Aggregation Effects. / Virkki, Kirsi; Hakola, Hanna; Urbani, Maxence; Tejerina, Lara; Ince, Mine; Martínez-Díaz, M. Victoria; Torres, Tomás; Golovanova, Viktoria; Golovanov, Viacheslav; Tkachenko, Nikolai V.

julkaisussa: Journal of Physical Chemistry C, Vuosikerta 121, Nro 17, 04.05.2017, s. 9594-9605.

Tutkimustuotosvertaisarvioitu

Harvard

Virkki, K, Hakola, H, Urbani, M, Tejerina, L, Ince, M, Martínez-Díaz, MV, Torres, T, Golovanova, V, Golovanov, V & Tkachenko, NV 2017, 'Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods: Aggregation Effects', Journal of Physical Chemistry C, Vuosikerta. 121, Nro 17, Sivut 9594-9605. https://doi.org/10.1021/acs.jpcc.7b01562

APA

Virkki, K., Hakola, H., Urbani, M., Tejerina, L., Ince, M., Martínez-Díaz, M. V., ... Tkachenko, N. V. (2017). Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods: Aggregation Effects. Journal of Physical Chemistry C, 121(17), 9594-9605. https://doi.org/10.1021/acs.jpcc.7b01562

Vancouver

Virkki K, Hakola H, Urbani M, Tejerina L, Ince M, Martínez-Díaz MV et al. Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods: Aggregation Effects. Journal of Physical Chemistry C. 2017 touko 4;121(17):9594-9605. https://doi.org/10.1021/acs.jpcc.7b01562

Author

Virkki, Kirsi ; Hakola, Hanna ; Urbani, Maxence ; Tejerina, Lara ; Ince, Mine ; Martínez-Díaz, M. Victoria ; Torres, Tomás ; Golovanova, Viktoria ; Golovanov, Viacheslav ; Tkachenko, Nikolai V. / Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods : Aggregation Effects. Julkaisussa: Journal of Physical Chemistry C. 2017 ; Vuosikerta 121, Nro 17. Sivut 9594-9605.

Bibtex - Lataa

@article{3fb68afd63f84804a9d62adacaa0312d,
title = "Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods: Aggregation Effects",
abstract = "Phthalocyanines (Pc) are well-known light-harvesting compounds. However, despite the tremendous efforts on phthalocyanine synthesis, the achieved energy conversion efficiencies for Pc-based dye-sensitized solar cells are moderate. To cast light on the factors reducing the conversion efficiency, we have undertaken a time-resolved spectroscopy study of the primary photoinduced reactions at a semiconductor-Pc interface. ZnO nanorods were chosen as a model semiconductor substrate with enhanced specific surface area. The use of a nanostructured oxide surface allows to extend the semiconductor-dye interface with a hole transporting layer (spiro-MeOTAD) in a controlled way, making the studied system closer to a solid-state dye-sensitized solar cell. Four zinc phthalocyanines are compared in this study. The compounds are equipped with bulky peripheral groups designed to reduce the self-aggregation of the Pcs. Almost no signs of aggregation can be observed from the absorption spectra of the Pcs assembled on a ZnO surface. Nevertheless, the time-resolved spectroscopy indicates that there are inter-Pc charge separation-recombination processes in the time frame of 1-100 ps. This may reduce the electron injection efficiency into the ZnO by more than 50{\%}, pointing out to a remaining aggregation effect. Surprisingly, the electron injection time does not correlate with the length of the linker connecting the Pc to ZnO. A correlation between the electron injection time and the {"}bulkiness{"} of the peripheral groups was observed. This correlation is further discussed with the use of computational modeling of the Pc arrangements on the ZnO surface. (Figure Presented).",
author = "Kirsi Virkki and Hanna Hakola and Maxence Urbani and Lara Tejerina and Mine Ince and Mart{\'i}nez-D{\'i}az, {M. Victoria} and Tom{\'a}s Torres and Viktoria Golovanova and Viacheslav Golovanov and Tkachenko, {Nikolai V.}",
year = "2017",
month = "5",
day = "4",
doi = "10.1021/acs.jpcc.7b01562",
language = "English",
volume = "121",
pages = "9594--9605",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society ACS",
number = "17",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Photoinduced Electron Injection from Zinc Phthalocyanines into Zinc Oxide Nanorods

T2 - Aggregation Effects

AU - Virkki, Kirsi

AU - Hakola, Hanna

AU - Urbani, Maxence

AU - Tejerina, Lara

AU - Ince, Mine

AU - Martínez-Díaz, M. Victoria

AU - Torres, Tomás

AU - Golovanova, Viktoria

AU - Golovanov, Viacheslav

AU - Tkachenko, Nikolai V.

PY - 2017/5/4

Y1 - 2017/5/4

N2 - Phthalocyanines (Pc) are well-known light-harvesting compounds. However, despite the tremendous efforts on phthalocyanine synthesis, the achieved energy conversion efficiencies for Pc-based dye-sensitized solar cells are moderate. To cast light on the factors reducing the conversion efficiency, we have undertaken a time-resolved spectroscopy study of the primary photoinduced reactions at a semiconductor-Pc interface. ZnO nanorods were chosen as a model semiconductor substrate with enhanced specific surface area. The use of a nanostructured oxide surface allows to extend the semiconductor-dye interface with a hole transporting layer (spiro-MeOTAD) in a controlled way, making the studied system closer to a solid-state dye-sensitized solar cell. Four zinc phthalocyanines are compared in this study. The compounds are equipped with bulky peripheral groups designed to reduce the self-aggregation of the Pcs. Almost no signs of aggregation can be observed from the absorption spectra of the Pcs assembled on a ZnO surface. Nevertheless, the time-resolved spectroscopy indicates that there are inter-Pc charge separation-recombination processes in the time frame of 1-100 ps. This may reduce the electron injection efficiency into the ZnO by more than 50%, pointing out to a remaining aggregation effect. Surprisingly, the electron injection time does not correlate with the length of the linker connecting the Pc to ZnO. A correlation between the electron injection time and the "bulkiness" of the peripheral groups was observed. This correlation is further discussed with the use of computational modeling of the Pc arrangements on the ZnO surface. (Figure Presented).

AB - Phthalocyanines (Pc) are well-known light-harvesting compounds. However, despite the tremendous efforts on phthalocyanine synthesis, the achieved energy conversion efficiencies for Pc-based dye-sensitized solar cells are moderate. To cast light on the factors reducing the conversion efficiency, we have undertaken a time-resolved spectroscopy study of the primary photoinduced reactions at a semiconductor-Pc interface. ZnO nanorods were chosen as a model semiconductor substrate with enhanced specific surface area. The use of a nanostructured oxide surface allows to extend the semiconductor-dye interface with a hole transporting layer (spiro-MeOTAD) in a controlled way, making the studied system closer to a solid-state dye-sensitized solar cell. Four zinc phthalocyanines are compared in this study. The compounds are equipped with bulky peripheral groups designed to reduce the self-aggregation of the Pcs. Almost no signs of aggregation can be observed from the absorption spectra of the Pcs assembled on a ZnO surface. Nevertheless, the time-resolved spectroscopy indicates that there are inter-Pc charge separation-recombination processes in the time frame of 1-100 ps. This may reduce the electron injection efficiency into the ZnO by more than 50%, pointing out to a remaining aggregation effect. Surprisingly, the electron injection time does not correlate with the length of the linker connecting the Pc to ZnO. A correlation between the electron injection time and the "bulkiness" of the peripheral groups was observed. This correlation is further discussed with the use of computational modeling of the Pc arrangements on the ZnO surface. (Figure Presented).

U2 - 10.1021/acs.jpcc.7b01562

DO - 10.1021/acs.jpcc.7b01562

M3 - Article

VL - 121

SP - 9594

EP - 9605

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 17

ER -