Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells

Yu Seok Yang, Hyung Do Kim, Jang Hyun Ryu, Kyung Kon Kim, Sung Soo Park, Kwang Soon Ahn, Jae Hong Kim

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

Organic photo-sensitizers were designed and synthesized based on a phenothiazine framework containing single- and double-electron acceptors that were bridged with thiophene for the dye sensitized solar cells (DSSCs). The optimized geometries were determined with density functional theory (DFT) calculations to estimate the photovoltaic properties of the dyes in the design stage. The organic dye with the double electron acceptors exhibited a better light absorption at long wavelength and an effective electron extraction pathway from the electron donor to the TiO2 surface, leading to an improved short-circuit current (11.6 mA cm-2), compared with that of the dye with the single electron acceptor (10.2 mA cm-2) and the conventional N3 Ru-dye (10.4 mA cm-2). Contrarily, the open-circuit voltage of the organic dye with the double electron acceptors decreased because the additional protonated carboxylic groups caused a positive shift in the Fermi level of TiO2.

Original languageEnglish
Pages (from-to)850-855
Number of pages6
JournalSynthetic Metals
Volume161
Issue number9-10
DOIs
StatePublished - May 2011

Keywords

  • Dye-sensitized solar cells
  • Multi-anchoring groups
  • Organic dyes
  • Short-circuit current enhancement
  • Structure optimization
  • Thiophene bridge

Fingerprint

Dive into the research topics of 'Effects of anchoring groups in multi-anchoring organic dyes with thiophene bridge for dye-sensitized solar cells'. Together they form a unique fingerprint.

Cite this