Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells

Yu Seok Yang; Hyung Do Kim; Jang Hyun Ryu; Kyung Kon Kim; Sung Soo Park; Kwang Soon Ahn; Jae Hong Kim

doi:10.1016/j.synthmet.2011.02.012

Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells

Yu Seok Yang, Hyung Do Kim, Jang Hyun Ryu, Kyung Kon Kim, Sung Soo Park, Kwang Soon Ahn, Jae Hong Kim

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

Organic photo-sensitizers were designed and synthesized based on a phenothiazine framework containing single- and double-electron acceptors that were bridged with thiophene for the dye sensitized solar cells (DSSCs). The optimized geometries were determined with density functional theory (DFT) calculations to estimate the photovoltaic properties of the dyes in the design stage. The organic dye with the double electron acceptors exhibited a better light absorption at long wavelength and an effective electron extraction pathway from the electron donor to the TiO₂ surface, leading to an improved short-circuit current (11.6 mA cm^-2), compared with that of the dye with the single electron acceptor (10.2 mA cm^-2) and the conventional N3 Ru-dye (10.4 mA cm^-2). Contrarily, the open-circuit voltage of the organic dye with the double electron acceptors decreased because the additional protonated carboxylic groups caused a positive shift in the Fermi level of TiO₂.

Original language	English
Pages (from-to)	850-855
Number of pages	6
Journal	Synthetic Metals
Volume	161
Issue number	9-10
DOIs	https://doi.org/10.1016/j.synthmet.2011.02.012
State	Published - May 2011

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology(2010-0017088), and by the Ministry of Education, Science Technology (MEST) and National Research Foundation of Korea(NRF) through the Human Resource Training Project for Regional Innovation.

Keywords

Dye-sensitized solar cells
Multi-anchoring groups
Organic dyes
Short-circuit current enhancement
Structure optimization
Thiophene bridge

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10.1016/j.synthmet.2011.02.012

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title = "Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells",

abstract = "Organic photo-sensitizers were designed and synthesized based on a phenothiazine framework containing single- and double-electron acceptors that were bridged with thiophene for the dye sensitized solar cells (DSSCs). The optimized geometries were determined with density functional theory (DFT) calculations to estimate the photovoltaic properties of the dyes in the design stage. The organic dye with the double electron acceptors exhibited a better light absorption at long wavelength and an effective electron extraction pathway from the electron donor to the TiO2 surface, leading to an improved short-circuit current (11.6 mA cm-2), compared with that of the dye with the single electron acceptor (10.2 mA cm-2) and the conventional N3 Ru-dye (10.4 mA cm-2). Contrarily, the open-circuit voltage of the organic dye with the double electron acceptors decreased because the additional protonated carboxylic groups caused a positive shift in the Fermi level of TiO2.",

keywords = "Dye-sensitized solar cells, Multi-anchoring groups, Organic dyes, Short-circuit current enhancement, Structure optimization, Thiophene bridge",

author = "Yang, {Yu Seok} and Kim, {Hyung Do} and Ryu, {Jang Hyun} and Kim, {Kyung Kon} and Park, {Sung Soo} and Ahn, {Kwang Soon} and Kim, {Jae Hong}",

note = "Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology(2010-0017088), and by the Ministry of Education, Science Technology (MEST) and National Research Foundation of Korea(NRF) through the Human Resource Training Project for Regional Innovation.",

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AU - Park, Sung Soo

AU - Ahn, Kwang Soon

AU - Kim, Jae Hong

N1 - Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology(2010-0017088), and by the Ministry of Education, Science Technology (MEST) and National Research Foundation of Korea(NRF) through the Human Resource Training Project for Regional Innovation.

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N2 - Organic photo-sensitizers were designed and synthesized based on a phenothiazine framework containing single- and double-electron acceptors that were bridged with thiophene for the dye sensitized solar cells (DSSCs). The optimized geometries were determined with density functional theory (DFT) calculations to estimate the photovoltaic properties of the dyes in the design stage. The organic dye with the double electron acceptors exhibited a better light absorption at long wavelength and an effective electron extraction pathway from the electron donor to the TiO2 surface, leading to an improved short-circuit current (11.6 mA cm-2), compared with that of the dye with the single electron acceptor (10.2 mA cm-2) and the conventional N3 Ru-dye (10.4 mA cm-2). Contrarily, the open-circuit voltage of the organic dye with the double electron acceptors decreased because the additional protonated carboxylic groups caused a positive shift in the Fermi level of TiO2.

AB - Organic photo-sensitizers were designed and synthesized based on a phenothiazine framework containing single- and double-electron acceptors that were bridged with thiophene for the dye sensitized solar cells (DSSCs). The optimized geometries were determined with density functional theory (DFT) calculations to estimate the photovoltaic properties of the dyes in the design stage. The organic dye with the double electron acceptors exhibited a better light absorption at long wavelength and an effective electron extraction pathway from the electron donor to the TiO2 surface, leading to an improved short-circuit current (11.6 mA cm-2), compared with that of the dye with the single electron acceptor (10.2 mA cm-2) and the conventional N3 Ru-dye (10.4 mA cm-2). Contrarily, the open-circuit voltage of the organic dye with the double electron acceptors decreased because the additional protonated carboxylic groups caused a positive shift in the Fermi level of TiO2.

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Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells

Abstract

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Keywords

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