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
Author
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Martínez Concha, Francisco
Author
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Neculqueo, Gloria
Author
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Bernede, Jean Christian
Author
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Cattin, Linda
Author
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Makha, Mohammed
Admission date
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2015-11-05T15:02:26Z
Available date
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2015-11-05T15:02:26Z
Publication date
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2015
Cita de ítem
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Phys. Status Solidi A 212, No. 8, 1767–1773 (2015)
en_US
Identifier
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DOI: 10.1002/pssa.201431845
Identifier
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https://repositorio.uchile.cl/handle/2250/134857
General note
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Artículo de publicación ISI
en_US
Abstract
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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.
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