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

Autor: Martinez, Francisco, Neculqueo, Gloria, Bernède, Jean Christian, Cattin, Linda, Makha, Mohammed
Přispěvatelé: Departamento de Matematicas, Universidad de Chile, MOLTECH-Anjou, Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: physica status solidi (a)
physica status solidi (a), Wiley, 2015, 212 (8), pp.1767-1773. ⟨10.1002/pssa.201431845⟩
ISSN: 0031-8965
1862-6319
DOI: 10.1002/pssa.201431845⟩
Popis: International audience; 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 (C60) 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 Alq3/Ca on the cathode side were used. This shows the effectiveness of the bilayer Alq3/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 Alq3/Ca structure with 6 nm of Alq3and 3 nm of Ca has an efficiency (η) of 2.28%, while a device without Ca has an efficiency of only 1.47%. Combining an optimized thickness of the new donor BSTV (22 nm) together with the bilayer cathode buffer layer, a device having an open-circuit voltage,Vocof 0.84 V, a short-circuit current,Jscof 3.60 mA cm−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.
Databáze: OpenAIRE
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