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

Authors
Type
Published Article
Journal
ChemPhysChem
1439-7641
Publisher
Wiley Blackwell (John Wiley & Sons)
Publication Date
Volume
15
Issue
17
Pages
3791–3799
Identifiers
DOI: 10.1002/cphc.201402505
PMID: 25234948
Source
Medline
Keywords
License
Unknown

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 :Eu(2+) 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 mA cm(-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.

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