Effect of donor moiety in organic sensitizer on spectral response, electrochemical and photovoltaic properties

Se Woong Park, Kyung In Son, Min Jae Ko, Kyungkon Kim, Nam Gyu Park

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


This paper describes the effects of donating ability in a D (donor)-π-A (acceptor) structured organic dye on the HOMO and LUMO energy levels and photovoltaic performance in dye-sensitized solar cell. Two different dyes were synthesized based on the cyanoacetic acid as an acceptor and the phenyl-thiophene as a π-conjugated bridge, where one contains a diethyl amino group (P2) and the other has an ethoxy group (P5) as the donor. The HOMO-LUMO energy gap was significantly influenced by donor group, where change of ethoxy donor with stronger amino one in donating ability decreased the energy gap from 2.84 eV to 2.21 eV. Moreover, it was also found that HOMO energy level was more sensitive to change in donor group than LUMO one. Photovoltaic performances of P2- and P5-dye-sensitized solar cells were systematically investigated in terms of the effects of co-adsorbent concentration, TiO2 film thickness and TiCl4 post-treatment. Under the best condition, the P5 dye showed the conversion efficiency of 2.62%, while the P2 dye exhibited much higher efficiency of 5.89% due to broader absorption.

Original languageEnglish
Pages (from-to)2571-2577
Number of pages7
JournalSynthetic Metals
Issue number23-24
StatePublished - Dec 2009

Bibliographical note

Funding Information:
This work was supported by the KIST internal projects under contract 2E20980 and the MOCIE new and renewable energy R&D project under contract 2006-N-PV12-P-05 . This work was also in part supported by the Sungkyunkwan University internal project. We thank Jong-Gyu Baek and Noh Jin Myung for providing the TiO 2 pastes.


  • Dye-sensitized
  • Electron donor
  • HOMO-LUMO energy tuning
  • Metal-free organic sensitizer
  • Photovoltaics
  • Solar cell


Dive into the research topics of 'Effect of donor moiety in organic sensitizer on spectral response, electrochemical and photovoltaic properties'. Together they form a unique fingerprint.

Cite this