Electrochemical impedance analysis on the additional layers for the enhancement on the performance of dye-sensitized solar cell

Hyunwoong Seo, Min Kyu Son, Songyi Park, Myeongsoo Jeong, Hee Je Kim, Giichiro Uchida, Naho Itagaki, Kazunori Koga, Masaharu Shiratani

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


A dye-sensitized solar cell is one of the representative photochemical solar cells. It has been actively studied and its performance has been much enhanced so far. For better performance, various additional layers such as compact, barrier, and light scattering layers have been applied. Compact and barrier layers suppress the charge recombination with redox electrolyte and light scattering layer improves the light harvesting. Although it was confirmed that these layers were clearly effective for the performance enhancement, there is still a variety of opinions concerning their electrochemical impedance analyses. Therefore, this work tried to analyze their effect on the internal impedance using electrochemical impedance spectroscopy. The most widely used materials were employed for the fabrication of additional layers. TiCl 4 and Zn(NO3)2â̂™6H 2O aqueous solutions, and a 400 nm sized TiO2 were used for compact, barrier, and light scattering layers, respectively. The photovoltaic characteristics confirmed their effect on the performance and their impedance spectra were analyzed according to high, middle, and low frequency bands. As a result, these layers mainly affected the impedance in the middle frequency range because the change of TiO2/dye/electrolyte interface was significantly associated with this impedance. Finally, all three layers were applied to a single cell and the performance was considerably increased with reduced charge recombination and improved light harvesting.

Original languageEnglish
Pages (from-to)122-126
Number of pages5
JournalThin Solid Films
Publication statusPublished - Mar 3 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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