The effect of N-substitution and ethylthio substitution on the performance of phenothiazine donors in dye-sensitized solar cells

Se Hun Kim, Chun Sakong, Jae Bok Chang, Boeun Kim, Min Jae Ko, Dong Hoe Kim, Kug Sun Hong, Jae Pil Kim

Research output: Contribution to journalReview articlepeer-review

39 Citations (Scopus)

Abstract

Three new organic sensitizers with phenothiazine chromophores were synthesized and used in dye-sensitized solar cells. N-substituents were added to the phenothiazine to suppress dye aggregation and an ethylthiol was added as an additional donor function. The effects of these substituents on the performance of the dyes were investigated by assessing the photophysical, electrochemical, and photovoltaic properties. The introduction of an N-methoxyphenyl unit improved the open-circuit voltage; the addition of the ethylthiol unit decreased the amount of dye adsorbed on the TiO2. A very high open-circuit voltage of 818.5 mV was achieved by the phenothiazine with added N-methoxyphenyl and ethylthiol groups. However, the best overall conversion efficiency was achieved by a cell fabricated with a phenothiazine devoid of the ethylthiol group (an overall conversion efficiency = 6.02%, short-circuit current = 10.20 mA/cm2, open-circuit voltage = 781.7 mV, fill factor = 75.50% under AM 1.5G conditions) due to the high open-circuit voltage and greater dye adsorption.

Original languageEnglish
Pages (from-to)262-271
Number of pages10
JournalDyes and Pigments
Volume97
Issue number1
DOIs
Publication statusPublished - 2013 Apr
Externally publishedYes

Keywords

  • Dihedral angle
  • Dye adsoption
  • Dye-sensitized solar cells
  • High open-circuit voltage
  • N-substituent
  • Phenothiazine dyes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'The effect of N-substitution and ethylthio substitution on the performance of phenothiazine donors in dye-sensitized solar cells'. Together they form a unique fingerprint.

Cite this