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

Hosseini, Z ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/cphc.201402505
  3. Abstract:
  4. 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
  5. Keywords:
  6. Dye-sensitized solar cells ; Dyes/pigments ; Luminescent down shifting ; Optical modeling ; Phosphors
  7. Source: ChemPhysChem ; Vol. 15, issue. 17 , 2014 , pp. 3791-3799 ; ISSN: 14394235
  8. URL: http://onlinelibrary.wiley.com/doi/10.1002/cphc.201402505/abstract