Funnel-structured TiO 2 electrode for improved charge extraction in dye-sensitized solar cell

Minhea Jin, Myeongkyu Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We here show that the current density and efficiency of dye-sensitized solar cell (DSSC) can be much enhanced by generating more bulky-structured funnels inside the typical TiO 2 electrode. This approach is fundamentally based on the pulsed laser-induced desorption and melting of TiO 2 nanoparticles. Three-beam interference was utilized to fabricate the periodic electrode structure. While the dye coverage was little influenced by this process because a small volume fraction of the electrode was converted into the bulky structure, the photoexcited electrons could be more effectively extracted owing to the prolonged diffusion length. As a result, the photocurrent density and efficiency of DSSCs were much improved. The enhancement of both factors was reliably ascertained by the multiple-cell characterization. The funnel cells exhibited an average short-circuit current density of 19.77 mA/cm 2 and an efficiency of 9.44%, while 17.30 mA/cm 2 and 8.27% were obtained from the reference cells.

Original languageEnglish
Pages (from-to)566-570
Number of pages5
JournalApplied Surface Science
Volume282
DOIs
Publication statusPublished - 2013 Oct 1

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All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

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