Synthesis and characterization of thieno[3,4-d]imidazole-based organic sensitizers for photoelectrochemical cells

Durai Karthik, Vijay Kumar, K. R. Justin Thomas*, Chun Ting Li, Kuo Chuan Ho

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

9 引文 斯高帕斯(Scopus)

摘要

Six organic sensitizers containing thieno[3,4-d]imidazole chromophore were synthesized and characterized by photophysical, electrochemical and photovoltaic studies. N-alkylated derivatives containing thiophene substituents showed blue-shifted absorption when compared to the dyes containing 4-tert-butyl-phenyl group attributable to the disturbance in the conjugation due to tilting in the structure. However, the former dyes exhibited red-shifted absorption when anchored on TiO2 due to enhanced aggregation. All dyes displayed negative solvatochromism in the absorption spectra indicating the charge transfer character and polar ground state. They exhibited low oxidation potentials than the dyes, known in the literature, which possess imidazole-based donor. Among the dyes, a dye containing bithiophene in the conjugation and thiophenes on thieno[3,4-d]imidazole nucleus showed best photovoltaic performance with η = 2.78%, Jsc = 7.91 mA cm-2 and ff = 0.63. Electrochemical impedance spectroscopy studies on the devices established the relationship between the functional chromophores on the electron injection and electron recombination kinetics.

原文英語
頁(從 - 到)60-70
頁數11
期刊Dyes and Pigments
129
DOIs
出版狀態已發佈 - 2016 6月 1
對外發佈

ASJC Scopus subject areas

  • 化學工程 (全部)
  • 製程化學與技術

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