Bulky dendritic triarylamine-based organic dyes for efficient co-adsorbent-free dye-sensitized solar cells

Yong Hua, Bin Jin, Hongda Wang, Xunjin Zhu, Wenjun Wu, Man Sing Cheung, Zhenyang Lin, Wai Yeung Wong, Wai Kwok Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

Abstract

Three new organic photosensitizers (HK1-HK3) incorporating functionalized bulky trimer of triarylamine derivatives as the electron donor units, 3,4-ethylenedioxythiophene moiety as the conjugated spacer, and cyanoacrylic acid as the electron acceptor, have been synthesized and the effects of different bulky electron donor substituents on the photovoltaic performances of dye-sensitized solar cells (DSSCs) are investigated accordingly. The DSSC based on HK1 with tris(triphenylamine) electron donor in the absence of the co-adsorbent chenodeoxycholic acid (CDCA) shows the best photovoltaic performance under standard global AM 1.5 sunlight: a short-circuit current density (Jsc) of 10.41 mA cm-2, an open-circuit voltage of 0.76 V and a fill factor of 0.65, corresponding to a maximum overall power conversion efficiency (PCE) of 5.11%. However, in the presence of co-adsorbent CDCA, the PCEs of DSSCs based on these photosensitizers, decrease significantly by about 9.7%, which is contrary to the conventional concept that CDCA can improve the efficiency by inhibition of dye aggregation and intermolecular electron recombination. The results demonstrate that the synthesized new organic dyes with bulky dendritic triarylamine and its derivatives as electron-donation units can efficiently suppress dye aggregation without the need of the co-adsorbent and effectively reduce the intramolecular electron recombination in DSSCs.
Original languageEnglish
Pages (from-to)195-203
Number of pages9
JournalJournal of Power Sources
Volume237
DOIs
Publication statusPublished - 17 Apr 2013
Externally publishedYes

Keywords

  • Aggregation
  • Co-adsorbent-free
  • Dendrimers
  • Dye-sensitized solar cells
  • Triarylamine derivatives

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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