Browsing by Author "Neculqueo, Gloria"

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    8-hydroxyquinolinato lithium nano-interlayer in tandem OPV devices
    (SPRINGER, 2022) Neculqueo, Gloria; Angel, Felipe A.
    8-hydroxyquinolinato lithium (Liq) nano-interlayer was evaluated as part of the interconnection layer (ICL) system Liq|Al|MoO3 to produce tandem organic photovoltaic (OPV) devices. First, the thickness dependence of Liq on the performance of single-stack OPV devices was studied, along with its stability by exposing the devices to different degradation conditions. The results confirmed the benefits of incorporating Liq, providing even further stability, particularly to devices exposed to air. Then, symmetrical tandem OPV devices were prepared by optimizing the thickness of the Al interlayer to obtain an efficient ICL. Although limited power conversion efficiencies were obtained due to the symmetry of the device architecture, electrical, optical, and lifetime measurements confirmed Liq|Al|MoO3 as a suitable ICL to achieve tandem OPV devices.
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    New Benzotrithiophene-Based Molecules as Organic P-Type Semiconductor for Small-Molecule Organic Solar Cells
    (2023) Castillo, Cristian; Aracena, Andres; Ballesteros, Luis; Neculqueo, Gloria; Gence, Loik; Quero, Franck
    A new benzotrithiophene-based small molecule, namely 2,5,8-Tris[5-(2,2-dicyanovinyl)-2-thienyl]-benzo[1,2-b:3,4-b ':6,5-b '']-trithiophene (DCVT-BTT), was successfully synthesized and subsequently characterized. This compound was found to present an intense absorption band at a wavelength position of similar to 544 nm and displayed potentially relevant optoelectronic properties for photovoltaic devices. Theoretical studies demonstrated an interesting behavior of charge transport as electron donor (hole-transporting) active material for heterojunction cells. A preliminary study of small-molecule organic solar cells based on DCVT-BTT (as the P-type organic semiconductor) and phenyl-C61-butyric acid methyl ester (as the N-type organic semiconductor) exhibited a power conversion efficiency of 2.04% at a donor: acceptor weight ratio of 1:1.
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    Thermal storage density of ionic liquid mixtures: A preliminary study as thermal fluid
    (2019) Mora, Sebastian; Neculqueo, Gloria; Tapia, Ricardo A.; Urzua, Julio, I
    For the purpose of calculate and compare the variation in thermal storage density, data for the thermal stability, heat capacity, and density properties of equimolar binary mixtures of 1-octyl-3-methylimidazolium and 1-octyl-2,3-dimethylimidazolium based ionic liquids have been measured. Preliminary analysis of fifteen mixtures obtained from six ionic liquid provide evidence that certain mixtures increase its heat capacity and hence its thermal storage density, offering a viable alternative to materials currently used in solar energy storage. (C) 2019 Elsevier B.V. All rights reserved.