Effect of molecular weight of oligomer on ionic diffusion in oligomer electrolytes and its implication for dye-sensitized solar cells

Jong Hyuk Park, Kyu Jin Choi, Junkyung Kim, Yong Soo Kang, Sang-Soo Lee

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

This study measures the diffusion coefficients of I- and I3 - in oligomer electrolytes as a function of the molecular weight of oligomers and investigates their effect on the performance of dye-sensitized solar cells (DSSCs). The high-diffusion coefficients of ions in an oligomer electrolyte with a lower molecular weight can help to promote the redox mechanism in DSSCs and thereby increase the short-circuit current density. They can also cause a decrease in the open-circuit voltage since a high-diffusion coefficient of I3 - is capable of reducing the lifetime of electrons in TiO2 electrodes. To offset these effects, N-methyl-benzimidazole is added to the oligomer electrolytes, thereby improving the open-circuit voltage and fill factor and, consequently, the overall energy-conversion efficiency, which increases to over 5%. A further test involving storage at a high temperature of 75 °C demonstrates that DSSCs employing the oligomer electrolytes show excellent thermal stability over 200 h.

Original languageEnglish
Pages (from-to)1029-1033
Number of pages5
JournalJournal of Power Sources
Volume173
Issue number2 SPEC. ISS.
DOIs
Publication statusPublished - 2007 Nov 15

Fingerprint

ionic diffusion
oligomers
Oligomers
Electrolytes
molecular weight
solar cells
dyes
Molecular weight
electrolytes
diffusion coefficient
Open circuit voltage
open circuit voltage
energy conversion efficiency
low molecular weights
short circuit currents
Energy conversion
Short circuit currents
Conversion efficiency
Thermodynamic stability
thermal stability

Keywords

  • Dye-sensitized solar cell
  • Ionic diffusion
  • Molecular weight
  • Non-volatile electrolyte
  • Poly(ethylene glycol)

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Effect of molecular weight of oligomer on ionic diffusion in oligomer electrolytes and its implication for dye-sensitized solar cells. / Park, Jong Hyuk; Choi, Kyu Jin; Kim, Junkyung; Kang, Yong Soo; Lee, Sang-Soo.

In: Journal of Power Sources, Vol. 173, No. 2 SPEC. ISS., 15.11.2007, p. 1029-1033.

Research output: Contribution to journalArticle

Park, Jong Hyuk ; Choi, Kyu Jin ; Kim, Junkyung ; Kang, Yong Soo ; Lee, Sang-Soo. / Effect of molecular weight of oligomer on ionic diffusion in oligomer electrolytes and its implication for dye-sensitized solar cells. In: Journal of Power Sources. 2007 ; Vol. 173, No. 2 SPEC. ISS. pp. 1029-1033.
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AU - Lee, Sang-Soo

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