Metal-free branched alkyl tetrathienoacene (TTAR)-based sensitizers for high-performance dye-sensitized solar cells

Yamuna Ezhumalai, Byunghong Lee, Miao Syuan Fan, Boris Harutyunyan, Kumaresan Prabakaran, Chuan Pei Lee, Sheng Hsiung Chang, Jen Shyang Ni, Sureshraju Vegiraju, Pragya Priyanka, Ya Wen Wu, Chia Wei Liu, Shuehlin Yau, Jiann T. Lin, Chun Guey Wu, Michael J. Bedzyk, Robert P. H. Chang, Ming Chou Chen, Kuo Chuan Ho, Tobin J Marks

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A new series of metal-free alkylated tetrathienoacene (TTAR)-based organic chromophores, TPA-TTAR-TA (R = branched-C8H17, 1, TTAR-b8; R = C15H31, 2, TTAR-15; R = C9H19, 3, TTAR-9), are synthesized for application in dye-sensitized solar cells (DSSCs). Due to the extensively conjugated TTAR π-bridge, all three dyes exhibit high extinction coefficients (1 × 105 M-1 cm-1). By systematically exploring the effects of the TTAR alkyl chain substituents, a significant influence of the dye coverage (orientation) on the TiO2 surfaces is observed. The branched-alkyl TTAR-b8 (1) promotes significant tilting and packing distortion on TiO2 in comparison to more ordered monolayers of linear long alkyls TTAR-15 (2) and TTAR-9 (3). Photophysical measurements on the dye-grafted TiO2 films reveal that the branched-alkylated TTA unit in 1 enhances the electron injection efficiency, in agreement with the high quantum efficiency. Notably, by utilizing a three-dimensional (3D) photonic crystal (PhC) layer to enhance the coherent scattering an increase the light absorption, TTAR-b8 exhibits higher short-circuit current densities and achieved a high PCE of 11.18%. TTAR-b8 is thus the best performing fused-thiophene-based organic DSSC dye reported to date.

Original languageEnglish
Pages (from-to)12310-12321
Number of pages12
JournalJournal of Materials Chemistry A
Volume5
Issue number24
DOIs
Publication statusPublished - 2017

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Coloring Agents
Dyes
Metals
Coherent scattering
Thiophenes
Electron injection
Thiophene
Chromophores
Photonic crystals
Quantum efficiency
Short circuit currents
Light absorption
Monolayers
Current density
Dye-sensitized solar cells

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Metal-free branched alkyl tetrathienoacene (TTAR)-based sensitizers for high-performance dye-sensitized solar cells. / Ezhumalai, Yamuna; Lee, Byunghong; Fan, Miao Syuan; Harutyunyan, Boris; Prabakaran, Kumaresan; Lee, Chuan Pei; Chang, Sheng Hsiung; Ni, Jen Shyang; Vegiraju, Sureshraju; Priyanka, Pragya; Wu, Ya Wen; Liu, Chia Wei; Yau, Shuehlin; Lin, Jiann T.; Wu, Chun Guey; Bedzyk, Michael J.; Chang, Robert P. H.; Chen, Ming Chou; Ho, Kuo Chuan; Marks, Tobin J.

In: Journal of Materials Chemistry A, Vol. 5, No. 24, 2017, p. 12310-12321.

Research output: Contribution to journalArticle

Ezhumalai, Y, Lee, B, Fan, MS, Harutyunyan, B, Prabakaran, K, Lee, CP, Chang, SH, Ni, JS, Vegiraju, S, Priyanka, P, Wu, YW, Liu, CW, Yau, S, Lin, JT, Wu, CG, Bedzyk, MJ, Chang, RPH, Chen, MC, Ho, KC & Marks, TJ 2017, 'Metal-free branched alkyl tetrathienoacene (TTAR)-based sensitizers for high-performance dye-sensitized solar cells', Journal of Materials Chemistry A, vol. 5, no. 24, pp. 12310-12321. https://doi.org/10.1039/c7ta01825h
Ezhumalai, Yamuna ; Lee, Byunghong ; Fan, Miao Syuan ; Harutyunyan, Boris ; Prabakaran, Kumaresan ; Lee, Chuan Pei ; Chang, Sheng Hsiung ; Ni, Jen Shyang ; Vegiraju, Sureshraju ; Priyanka, Pragya ; Wu, Ya Wen ; Liu, Chia Wei ; Yau, Shuehlin ; Lin, Jiann T. ; Wu, Chun Guey ; Bedzyk, Michael J. ; Chang, Robert P. H. ; Chen, Ming Chou ; Ho, Kuo Chuan ; Marks, Tobin J. / Metal-free branched alkyl tetrathienoacene (TTAR)-based sensitizers for high-performance dye-sensitized solar cells. In: Journal of Materials Chemistry A. 2017 ; Vol. 5, No. 24. pp. 12310-12321.
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abstract = "A new series of metal-free alkylated tetrathienoacene (TTAR)-based organic chromophores, TPA-TTAR-TA (R = branched-C8H17, 1, TTAR-b8; R = C15H31, 2, TTAR-15; R = C9H19, 3, TTAR-9), are synthesized for application in dye-sensitized solar cells (DSSCs). Due to the extensively conjugated TTAR π-bridge, all three dyes exhibit high extinction coefficients (1 × 105 M-1 cm-1). By systematically exploring the effects of the TTAR alkyl chain substituents, a significant influence of the dye coverage (orientation) on the TiO2 surfaces is observed. The branched-alkyl TTAR-b8 (1) promotes significant tilting and packing distortion on TiO2 in comparison to more ordered monolayers of linear long alkyls TTAR-15 (2) and TTAR-9 (3). Photophysical measurements on the dye-grafted TiO2 films reveal that the branched-alkylated TTA unit in 1 enhances the electron injection efficiency, in agreement with the high quantum efficiency. Notably, by utilizing a three-dimensional (3D) photonic crystal (PhC) layer to enhance the coherent scattering an increase the light absorption, TTAR-b8 exhibits higher short-circuit current densities and achieved a high PCE of 11.18{\%}. TTAR-b8 is thus the best performing fused-thiophene-based organic DSSC dye reported to date.",
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T1 - Metal-free branched alkyl tetrathienoacene (TTAR)-based sensitizers for high-performance dye-sensitized solar cells

AU - Ezhumalai, Yamuna

AU - Lee, Byunghong

AU - Fan, Miao Syuan

AU - Harutyunyan, Boris

AU - Prabakaran, Kumaresan

AU - Lee, Chuan Pei

AU - Chang, Sheng Hsiung

AU - Ni, Jen Shyang

AU - Vegiraju, Sureshraju

AU - Priyanka, Pragya

AU - Wu, Ya Wen

AU - Liu, Chia Wei

AU - Yau, Shuehlin

AU - Lin, Jiann T.

AU - Wu, Chun Guey

AU - Bedzyk, Michael J.

AU - Chang, Robert P. H.

AU - Chen, Ming Chou

AU - Ho, Kuo Chuan

AU - Marks, Tobin J

PY - 2017

Y1 - 2017

N2 - A new series of metal-free alkylated tetrathienoacene (TTAR)-based organic chromophores, TPA-TTAR-TA (R = branched-C8H17, 1, TTAR-b8; R = C15H31, 2, TTAR-15; R = C9H19, 3, TTAR-9), are synthesized for application in dye-sensitized solar cells (DSSCs). Due to the extensively conjugated TTAR π-bridge, all three dyes exhibit high extinction coefficients (1 × 105 M-1 cm-1). By systematically exploring the effects of the TTAR alkyl chain substituents, a significant influence of the dye coverage (orientation) on the TiO2 surfaces is observed. The branched-alkyl TTAR-b8 (1) promotes significant tilting and packing distortion on TiO2 in comparison to more ordered monolayers of linear long alkyls TTAR-15 (2) and TTAR-9 (3). Photophysical measurements on the dye-grafted TiO2 films reveal that the branched-alkylated TTA unit in 1 enhances the electron injection efficiency, in agreement with the high quantum efficiency. Notably, by utilizing a three-dimensional (3D) photonic crystal (PhC) layer to enhance the coherent scattering an increase the light absorption, TTAR-b8 exhibits higher short-circuit current densities and achieved a high PCE of 11.18%. TTAR-b8 is thus the best performing fused-thiophene-based organic DSSC dye reported to date.

AB - A new series of metal-free alkylated tetrathienoacene (TTAR)-based organic chromophores, TPA-TTAR-TA (R = branched-C8H17, 1, TTAR-b8; R = C15H31, 2, TTAR-15; R = C9H19, 3, TTAR-9), are synthesized for application in dye-sensitized solar cells (DSSCs). Due to the extensively conjugated TTAR π-bridge, all three dyes exhibit high extinction coefficients (1 × 105 M-1 cm-1). By systematically exploring the effects of the TTAR alkyl chain substituents, a significant influence of the dye coverage (orientation) on the TiO2 surfaces is observed. The branched-alkyl TTAR-b8 (1) promotes significant tilting and packing distortion on TiO2 in comparison to more ordered monolayers of linear long alkyls TTAR-15 (2) and TTAR-9 (3). Photophysical measurements on the dye-grafted TiO2 films reveal that the branched-alkylated TTA unit in 1 enhances the electron injection efficiency, in agreement with the high quantum efficiency. Notably, by utilizing a three-dimensional (3D) photonic crystal (PhC) layer to enhance the coherent scattering an increase the light absorption, TTAR-b8 exhibits higher short-circuit current densities and achieved a high PCE of 11.18%. TTAR-b8 is thus the best performing fused-thiophene-based organic DSSC dye reported to date.

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JO - Journal of Materials Chemistry A

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