Bis-imidazolium iodide organic ionic plastic crystals and their applications to solid state dye-sensitized solar cells

Minjae Lee, Yong Hoon Lee, Jong Hyeok Park, U. Hyeok Choi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Novel dicationic bis-imidazolium iodide salts have been discovered as new organic ionic plastic crystalline materials. Most of them show multiple solid-solid phase transitions below their melting temperatures. Their phase transition temperatures are dependent on the imidazolium cation structure. According to Timmermans' definition of plastic crystals, bis-imidazolium iodide salts with either n-heptyl or n-octyl side arms can be classified as “true plastic crystals” because of their low ΔSf values (<20 J mol−1 K−1). The bis-imidazolium iodide salts are stable up to 260 °C under thermal gravimetric analysis. The ionic conductivities, investigated using dielectric relaxation spectroscopy, follow the Arrhenius temperature dependence with discontinuities and changes in slopes at the observed solid–solid phase transition temperature. Dye-sensitized solar cells (DSSCs) fabricated by a whole solid-state electrolyte consisting of n-hexyl side-armed bis-imidazolium iodide (BII-6) show a 4.93% power conversion efficiency (η): a remarkable result for the solid-state electrolyte system compared to that obtained using an liquid electrolyte with 1-butyl-3-methylimidazolium iodide (η = 8.00%) as a reference composition.

Original languageEnglish
Pages (from-to)241-247
Number of pages7
JournalOrganic Electronics
Volume48
DOIs
Publication statusPublished - 2017 Sep

Fingerprint

Iodides
iodides
plastics
solar cells
dyes
Plastics
solid state
Crystals
Phase transitions
Electrolytes
Salts
Superconducting transition temperature
crystals
electrolytes
salts
transition temperature
Dielectric relaxation
Gravimetric analysis
Ionic conductivity
Conversion efficiency

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Bis-imidazolium iodide organic ionic plastic crystals and their applications to solid state dye-sensitized solar cells",
abstract = "Novel dicationic bis-imidazolium iodide salts have been discovered as new organic ionic plastic crystalline materials. Most of them show multiple solid-solid phase transitions below their melting temperatures. Their phase transition temperatures are dependent on the imidazolium cation structure. According to Timmermans' definition of plastic crystals, bis-imidazolium iodide salts with either n-heptyl or n-octyl side arms can be classified as “true plastic crystals” because of their low ΔSf values (<20 J mol−1 K−1). The bis-imidazolium iodide salts are stable up to 260 °C under thermal gravimetric analysis. The ionic conductivities, investigated using dielectric relaxation spectroscopy, follow the Arrhenius temperature dependence with discontinuities and changes in slopes at the observed solid–solid phase transition temperature. Dye-sensitized solar cells (DSSCs) fabricated by a whole solid-state electrolyte consisting of n-hexyl side-armed bis-imidazolium iodide (BII-6) show a 4.93{\%} power conversion efficiency (η): a remarkable result for the solid-state electrolyte system compared to that obtained using an liquid electrolyte with 1-butyl-3-methylimidazolium iodide (η = 8.00{\%}) as a reference composition.",
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Bis-imidazolium iodide organic ionic plastic crystals and their applications to solid state dye-sensitized solar cells. / Lee, Minjae; Lee, Yong Hoon; Park, Jong Hyeok; Choi, U. Hyeok.

In: Organic Electronics, Vol. 48, 09.2017, p. 241-247.

Research output: Contribution to journalArticle

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