Assessment of luminescent downshifting layers for the improvement of light-harvesting efficiency in dye-sensitized solar cells

Zahra Hosseini, Wei-Guang Diau, Khashayar Mehrany, Nima Taghavinia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Luminescence downshifting (LDS) of light can be a practical photon management technique to compensate the narrow absorption band of high-extinction-coefficient dyes in dye-sensitized solar cells (DSSCs). Herein, an optical analysis on the loss mechanisms in a reflective LDS (R-LDS)/DSSC configuration is reported. For squaraine dye (550-700 nm absorption band) and CaAlSiN3:Eu2+ LDS material (550-700 nm emission band), the major loss channels are found to be non-unity luminescence quantum efficiency (QE) and electrolyte absorption. By using an ideal LDS layer (QE=100 %), a less absorbing electrolyte (Co-based), and antireflection coatings, approximately 20% better light harvesting is obtained. If the absorption/emission band of dye/LDS is shifted to 800 nm, a maximal short-circuit current density (Jsc) of 22.1 mAcm-2 can be achieved. By putting the LDS layer in front of the DSSC (transmissive mode), more significant loss channels are observed, and hence a lower overall efficiency than the R-LDS configuration.

Original languageEnglish
Pages (from-to)3791-3799
Number of pages9
JournalChemPhysChem
Volume15
Issue number17
DOIs
StatePublished - 12 Jan 2014

Keywords

  • Dye-sensitized solar cells
  • Dyes/pigments
  • Luminescent down shifting
  • Optical modeling
  • Phosphors

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