Donor-π-acceptor type diphenylaminothiophenyl anthracene-mediated organic photosensitizers for dye-sensitized solar cells

Dong Uk Heo, Sun Jae Kim, Beom Jin Yoo, Boeun Kim, Min Jae Ko, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Two new metal-free organic dyes bridged by anthracene-mediated p-conjugated moieties were successfully synthesized for use in a dye-sensitized solar cell (DSSC). A N,N-diphenylthiophen-2-amine unit in these dyes acts as an electron donor, while a (E)-2-cyano-3-(thiophen-2-yl)acrylic acid group acts as an electron acceptor and an anchoring group to the TiO2 electrode. The photovoltaic properties of (E)-2-cyano-3-(5-((10-(5- (diphenylamino)thiophen-2- yl)anthracen-9-yl)ethynyl)thiophen-2-yl)acrylic acid (DPATAT) and (E)-2- cyano-3-(5'-((10-(5-(diphenylamino)thiophen-2-yl)anthracen-9-yl)ethynyl)-2, 2'-bithiophen-5-yl)acrylic acid (DPATABT) were investigated to identify the effect of conjugation length between electron donor and acceptor on the DSSC performance. By introducing an anthracene moiety into the dye structure, together with a triple bond and thiophene moieties for fine-tuning of molecular configurations and for broadening the absorption spectra, the short-circuit photocurrent densities (Jsc), and open-circuit photovoltages (Voc) of DSSCs were improved. The improvement of Jsc in DSSC made of DPATABT might be attributed to much broader absorption spectrum and higher molecular extinction coefficient (ε) in the visible wavelength range. The DPATABT-based DSSC showed the highest power conversion efficiency (PCE) of 3.34% (ηmax = 3.70%) under AM 1.5 illumination (100 mW cm-2) in a photoactive area of 0.41 cm2, with the Jsc of 7.89 mA cm-2, the Voc of 0.59 V, and the fill factor (FF) of 72%. In brief, the solar cell performance with DPATABT was found to be better than that of DPATAT-based DSSC.

Original languageEnglish
Pages (from-to)1081-1088
Number of pages8
JournalBulletin of the Korean Chemical Society
Volume34
Issue number4
DOIs
Publication statusPublished - 2013 Apr 20

Keywords

  • Anthracene
  • Conjugation length
  • Dyes-sensitized solar cells
  • N,N-Diphenylthiophen-2-amine
  • Power conversion efficiency

ASJC Scopus subject areas

  • Chemistry(all)

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