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Raissi, M., Pellegrin, Y., Jobic, S., Boujtita, M. & Odobel, F. (2016) Infra-red photoresponse of mesoscopic NiO-based solar cells sensitized with PbS quantum dot. Sci Rep, 6 24908. 
Added by: Richard Baschera (2016-06-01 11:41:25)   Last edited by: Richard Baschera (2016-06-02 10:03:43)
Type de référence: Article
DOI: 10.1038/srep24908
Numéro d'identification (ISBN etc.): 2045-2322
Clé BibTeX: Raissi2016
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Catégories: MIOPS
Mots-clés: charge-transfer, cobalt, injection, nanocrystals, nanoparticles, p-type nio, photocathodes, photoelectrochemical cell, photovoltaics, Water
Créateurs: Boujtita, Jobic, Odobel, Pellegrin, Raissi
Collection: Sci Rep
Consultations : 1/621
Indice de consultation : 4%
Indice de popularité : 1%
Résumé     
Sensitized NiO based photocathode is a new field of investigation with increasing scientific interest in relation with the development of tandem dye-sensitized solar cells (photovoltaic) and dye-sensitized photoelectrosynthetic cells (solar fuel). We demonstrate herein that PbS quantum dots (QDs) represent promising inorganic sensitizers for NiO-based quantum dot-sensitized solar cells (QDSSCs). The solar cell sensitized with PbS quantum dot exhibits significantly higher photoconversion efficiency than solar cells sensitized with a classical and efficient molecular sensitizer (P1 dye = 4-(Bis-{4-[5-(2,2-dicyano-vinyl)-thiophene-2-yl]-phenyl}-amino)-benzoic acid). Furthermore, the system features an IPCE (Incident Photon-to-Current Efficiency) spectrum that spreads into the infra-red region, reaching operating wavelengths of 950 nm. The QDSSC photoelectrochemical device works with the complexes tris(4,4'-ditert-butyl-2,2'-bipyridine) cobalt(III/II) redox mediators, underscoring the formation of a long-lived charge-separated state. The electrochemical impedance spectrocopy measurements are consistent with a high packing of the QDs upon the NiO surface, the high density of which limits the access of the electrolyte and results in favorable light absorption cross-sections and a significant hole lifetime. These notable results highlight the potential of NiO-based photocathodes sensitized with quantum dots for accessing and exploiting the low-energy part of the solar spectrum in photovoltaic and photocatalysis applications.
  
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