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Martinez, F., Neculqueo, G., Bernede, J. C., Cattin, L. & Makha, M. (2015) Influence of the presence of Ca in the cathode buffer layer on the performance and stability of organic photovoltaic cells using a branched sexithienylenevinylene oligomer as electron donor. Phys. Status Solidi A-Appl. Mat. 212 1767–1773. 
Added by: Laurent Cournède (2016-03-10 18:36:41)
Type de référence: Article
DOI: 10.1002/pssa.201431845
Numéro d'identification (ISBN etc.): 1862-6300
Clé BibTeX: Martinez2015
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Catégories: CESES
Mots-clés: anode buffer, branched sexithienylenevinylene oligomer, buffer layers, copper phthalocyanine, exciton blocking layer, Heterojunctions, Lifetime, optimization, organic solar cells, solar-cells, thin-films
Créateurs: Bernede, Cattin, Makha, Martinez, Neculqueo
Collection: Phys. Status Solidi A-Appl. Mat.
Consultations : 2/456
Indice de consultation : 1%
Indice de popularité : 0.25%
Résumé     
A new branched sexithienylene vinylene oligomer, (E)-bis-1,2-(5,5-dimethyl-(2,2:3,2-terthiophene)vinylene (BSTV), was synthesized, characterized, and used as the electron donor in a planar heterojunction organic photovoltaic cell (OPVC). The OPVC utilized fullerene (C-60) as the electron acceptor, ITO-coated glass as the anode, and aluminum as the cathode. Hybrid electrode buffer layers of MoO3/CuI on the anode side and of Alq(3)/Ca on the cathode side were used. This shows the effectiveness of the bilayer Alq(3)/Ca as a cathode buffer layer. The thickness of the Ca layer and its effect on the performance and lifetime of the OPVCs were studied. It was found that an Alq(3)/Ca structure with 6nm of Alq(3) and 3nm of Ca has an efficiency () of 2.28\%, while a device without Ca has an efficiency of only 1.47\%. Combining an optimized thickness of the new donor BSTV (22nm) together with the bilayer cathode buffer layer, a device having an open-circuit voltage, V-oc of 0.84V, a short-circuit current, J(sc) of 3.60mAcm(-2), and a fill factor, FF of 50\% was achieved. However, the efficiency of the OPV with Ca decreases rapidly during the first hours of air exposure, resulting in device performance that is similar to a device fabricated without Ca. After this initial degradation, device performance for both types of OPV evolves similarly with continued air exposure.
Added by: Laurent Cournède  
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