Effects of porphyrinic meso-substituents on the photovoltaic performance of dye-sensitized solar cells: Number and position of p-carboxyphenyl and thienyl groups on zinc porphyrins

Ram Ambre, Kwan Bo Chen, Ching Fa Yao, Liyang Luo, Eric Wei Guang Diau, Chen Hsiung Hung

Research output: Contribution to journalArticle

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Abstract

In order to understand the effects of meso-substituents of the zinc porphyrins on optical, electrochemical, and photovoltaic properties, a series of porphyrins with different combinations of thienyl (S) and p-carboxyphenyl (A) groups as the meso substituents have been systematically synthesized and studied. The properties of zinc complexes 3S1A, trans-2S2A, cis-2S2A, and 1S3A were fully investigated by absorption and emission spectra, attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectra, density functional theory (DFT) calculations, electrochemical, photophysical, and photovoltaic measurements. With the increasing number of meso-thienyl groups, slight red-shifts of Soret and Q bands were observed in both absorption and emission spectra. All of the absorption spectra of zinc porphyrins on TiO 2 film show broadening and splitting of Soret bands because of excitonic coupling of porphyrins. ATR-FTIR spectra revealed likely modes to determine either a single arm (in 3S1A and trans-2S2A) or double arms (in 1S3A and cis-2S2A) attached on TiO 2. Two factors of p-carboxyphenyl and thienyl groups affecting the devices performance-heavy atom effect and the amount of dye loading on TiO 2-are concluded. Overall, the power conversion efficiencies (η) of the devices exhibit the following order: 1S3A (3.0%) > cis-2S2A (2.5%) > trans-2S2A (1.8%) ≫ 3S1A (0.2%).

Original languageEnglish
Pages (from-to)11907-11916
Number of pages10
JournalJournal of Physical Chemistry C
Volume116
Issue number22
DOIs
Publication statusPublished - 2012 Jun 7

Fingerprint

Porphyrins
porphyrins
Fourier transforms
Zinc
zinc
solar cells
dyes
Infrared radiation
absorption spectra
Conversion efficiency
Density functional theory
Absorption spectra
emission spectra
Coloring Agents
infrared spectra
reflectance
Atoms
red shift
Dyes
density functional theory

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Effects of porphyrinic meso-substituents on the photovoltaic performance of dye-sensitized solar cells : Number and position of p-carboxyphenyl and thienyl groups on zinc porphyrins. / Ambre, Ram; Chen, Kwan Bo; Yao, Ching Fa; Luo, Liyang; Diau, Eric Wei Guang; Hung, Chen Hsiung.

In: Journal of Physical Chemistry C, Vol. 116, No. 22, 07.06.2012, p. 11907-11916.

Research output: Contribution to journalArticle

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abstract = "In order to understand the effects of meso-substituents of the zinc porphyrins on optical, electrochemical, and photovoltaic properties, a series of porphyrins with different combinations of thienyl (S) and p-carboxyphenyl (A) groups as the meso substituents have been systematically synthesized and studied. The properties of zinc complexes 3S1A, trans-2S2A, cis-2S2A, and 1S3A were fully investigated by absorption and emission spectra, attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectra, density functional theory (DFT) calculations, electrochemical, photophysical, and photovoltaic measurements. With the increasing number of meso-thienyl groups, slight red-shifts of Soret and Q bands were observed in both absorption and emission spectra. All of the absorption spectra of zinc porphyrins on TiO 2 film show broadening and splitting of Soret bands because of excitonic coupling of porphyrins. ATR-FTIR spectra revealed likely modes to determine either a single arm (in 3S1A and trans-2S2A) or double arms (in 1S3A and cis-2S2A) attached on TiO 2. Two factors of p-carboxyphenyl and thienyl groups affecting the devices performance-heavy atom effect and the amount of dye loading on TiO 2-are concluded. Overall, the power conversion efficiencies (η) of the devices exhibit the following order: 1S3A (3.0{\%}) > cis-2S2A (2.5{\%}) > trans-2S2A (1.8{\%}) ≫ 3S1A (0.2{\%}).",
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