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  1. Article: Influence of the Coordinated Ligand on the Optical and Electrical Properties in Titanium Phthalocyanine-Based Active Films for Photovoltaics.

    Sánchez Vergara, María Elena / Villanueva Heredia, Luisa Fernanda / Hamui, Leon

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 2

    Abstract: Tetravalent titanyl phthalocyanine (TiOPc) and titanium phthalocyanine dichloride ( ... ...

    Abstract Tetravalent titanyl phthalocyanine (TiOPc) and titanium phthalocyanine dichloride (TiCl
    Language English
    Publishing date 2023-01-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16020551
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Using Recycled Tetrapak and Doped Titanyl/Vanadyl Phthalocyanine to Make Solid-State Devices.

    Sánchez Vergara, María Elena / Toledo Dircio, Emiliano / Cantera Cantera, Luis Alberto / Bazán-Diaz, Lourdes / Salcedo, Roberto

    Materials (Basel, Switzerland)

    2024  Volume 17, Issue 2

    Abstract: In this work we studied the semiconductor behavior of titanyl phthalocyanine (TiOPc) and vanadyl phthalocyanine (VOPc), doped with anthraflavic acid and deposited on Tetrapak/graphite as flexible electrodes. The molecular structure was approached using ... ...

    Abstract In this work we studied the semiconductor behavior of titanyl phthalocyanine (TiOPc) and vanadyl phthalocyanine (VOPc), doped with anthraflavic acid and deposited on Tetrapak/graphite as flexible electrodes. The molecular structure was approached using the density functional theory and astonishingly, it was found that the structure and electronic behavior can change depending on the metal in the phthalocyanine. Experimentally, the Root Mean Square was found to be 124 and 151 nm for the VOPc-Anthraflavine and TiOPc-Anthraflavine films, respectively, and the maximum stress was 8.58 MPa for the film with VOPc. The TiOPc-Anthraflavine film presents the smallest fundamental gap of 1.81 eV and 1.98 eV for indirect and direct transitions, respectively. Finally, the solid-state devices were fabricated, and the electrical properties were examined. The tests showed that the current-voltage curves of the devices on Tetrapak and VOPc-Anthraflavine on a rigid substrate exhibit the same current saturation behavior at 10 mA, which is achieved for different voltage values. Since the current-voltage curves of the TiOPc-Anthraflavine on a rigid substrate presents a defined diode model behavior, it was approximated by nonlinear least squares, and it has been determined that the threshold voltage of the sample for the different lighting conditions is between 0.6 and 0.8 volts.
    Language English
    Publishing date 2024-01-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma17020309
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Structural determination, characterization and computational studies of doped semiconductors base silicon phthalocyanine dihydroxide and dienynoic acids.

    Sánchez Vergara, María Elena / Sandoval Plata, Emilio I / Ballinas Indili, Ricardo / Salcedo, Roberto / Álvarez Toledano, Cecilio

    Heliyon

    2024  Volume 10, Issue 3, Page(s) e25518

    Abstract: The chemical doping of silicon phthalocyanine dihydroxide (SiPc(OH) ...

    Abstract The chemical doping of silicon phthalocyanine dihydroxide (SiPc(OH)
    Language English
    Publishing date 2024-02-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2024.e25518
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Analysis of a Flexible Photoconductor, Manufactured with Organic Semiconductor Films.

    Cantera Cantera, Luis Alberto / Sánchez Vergara, María Elena / Hamui, Leon / Mejía Prado, Isidro / Flores Huerta, Alejandro / Martínez Plata, Teresa Lizet

    Micromachines

    2024  Volume 15, Issue 4

    Abstract: This work presents the evaluation of the electrical behavior of a flexible photoconductor with a planar heterojunction architecture made up of organic semiconductor films deposited by high vacuum evaporation. The heterojunction was characterized in its ... ...

    Abstract This work presents the evaluation of the electrical behavior of a flexible photoconductor with a planar heterojunction architecture made up of organic semiconductor films deposited by high vacuum evaporation. The heterojunction was characterized in its morphology and mechanical properties by scanning electron microscopy and atomic force microscopy. The electrical characterization was carried out through the approximations of ohmic and SCLC (Space-Charge Limited Current) behaviors using experimental J-V (current density-voltage) curves at different voltages and under different light conditions. The optimization of the photoconductor was carried out through annealing and accelerated lighting processes. With these treatments, the Knoop Hardness of the flexible photoconductor has reached a value of 8 with a tensile strength of 5.7 MPa. The ohmic and SCLC approximations demonstrate that the unannealed device has an ohmic behavior, whereas the annealed device has an SCLC behavior, and after the optimization process, an ohmic behavior and a maximum current density of 0.34 mA/mm
    Language English
    Publishing date 2024-03-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi15040446
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Innovative Implementation of an Alternative Tetrathiafulvene Derivative for Flexible Indium Phthalocyanine Chloride-Based Solar Cells.

    Hamui, Leon / Sánchez-Vergara, María Elena

    Micromachines

    2021  Volume 12, Issue 6

    Abstract: Herein, we present the photovoltaic properties of an indium phthalocyanine chloride (InClPc)-based flexible planar heterojunction device, introducing the tetrathiafulvene derivative 4,4'-Dimethyl-5,5'-diphenyltetrathiafulvalene (DMDP-TTF) as the electron ...

    Abstract Herein, we present the photovoltaic properties of an indium phthalocyanine chloride (InClPc)-based flexible planar heterojunction device, introducing the tetrathiafulvene derivative 4,4'-Dimethyl-5,5'-diphenyltetrathiafulvalene (DMDP-TTF) as the electron donor layer. UV-vis spectroscopy is widely used to characterize the electronic behavior of the InClPc/DMDP-TTF active layer. The interactions between the DMDP-TTF and phthalocyanine are predominantly intermolecular and the result of the aggregation of InClPc. Tauc bands were obtained at 1.41 and 2.8 eV; these energy peaks can result in a charge transfer ascribed to the transition from the DMDP-TTF to π-orbitals that are associated with the phthalocyanine ring or even with the same indium metal center. Conductive carbon (CC) was used for the cathode. Finally, an indium tin oxide (ITO)/InClPc/DMDP-TTF/CC device was fabricated by high-vacuum thermal evaporation onto a flexible substrate and the photovoltaic properties were evaluated. A diode type I-V curve behavior was observed with a photovoltaic response under illumination. A generated photocurrent of 2.25 × 10
    Language English
    Publishing date 2021-05-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi12060633
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Preparation of Hybrid Films Based in Aluminum 8-Hydroxyquinoline as Organic Semiconductor for Photoconductor Applications.

    Sánchez Vergara, María Elena / Cantera Cantera, Luis Alberto / Rios, Citlalli / Salcedo, Roberto / Lozada Flores, Octavio / Dutt, Ateet

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 18

    Abstract: In the present work, we have investigated an organic semiconductor based on tris(8-hydroxyquinoline) aluminum ( ... ...

    Abstract In the present work, we have investigated an organic semiconductor based on tris(8-hydroxyquinoline) aluminum (AlQ
    Language English
    Publishing date 2023-09-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23187708
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Influence of the Polymeric Matrix on the Optical and Electrical Properties of Copper Porphine-Based Semiconductor Hybrid Films.

    Sánchez Vergara, Maria Elena / Hernández Méndez, Joaquín André / González Verdugo, Daniela / Giammattei Funes, Isabella María / Lozada Flores, Octavio

    Polymers

    2023  Volume 15, Issue 14

    Abstract: In this study, we assessed the electrical and optical behavior of semiconductor hybrid films fabricated from octaethyl-21H,23H-porphine copper (CuP), embedded in polymethylmethacrylate (PMMA), and polystyrene (PS). The hybrid films were characterized ... ...

    Abstract In this study, we assessed the electrical and optical behavior of semiconductor hybrid films fabricated from octaethyl-21H,23H-porphine copper (CuP), embedded in polymethylmethacrylate (PMMA), and polystyrene (PS). The hybrid films were characterized structurally and morphologically using infrared spectroscopy (IR), atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Subsequently, the PMMA:CuP and PS:CuP hybrid films were evaluated optically by UV-vis spectroscopy, as well as electrically, with the four-point collinear method. Hybrid films present a homogeneous and low roughness morphology. In addition, the PS matrix allows the crystallization of the porphin, while PMMA promotes the amorphous structure in CuP. The polymeric matrix also affects the optical behavior of the films, since the smallest optical gap (2.16 eV) and onset gap (1.89 eV), and the highest transparency are obtained in the film with a PMMA matrix. Finally, the electrical behavior in hybrid films is also affected by the matrix: the largest amount of current carried is approximately 0.01 A for the PS:CuP film, and 0.0015 A for the PMMA:CuP film. Thanks to the above properties, hybrid films are promising candidates for use in optoelectronic devices.
    Language English
    Publishing date 2023-07-22
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15143125
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Regiodivergent synthesis of vinyl trifluoromethansulfonates γ/δ lactones: Via 1,6 addition/intramolecular one-pot annulation of 1,4-dihidropyridines derivated from pyridinyl propenones

    Carmona-Reyes, Genaro / Ballinas-Indili, Ricardo / Sánchez-Vergara, María Elena / Toscano, R. Alfredo / Álvarez-Toledano, Cecilio

    Tetrahedron letters. 2022 Jan. 05, v. 88

    2022  

    Abstract: We report a novel intramolecular 1,6 oxa-Michael addition on substituted dihydropyridines to obtain 5 and 6 member ring lactones in an one-pot reaction starting from activated pyridinyl propenones, without organic catalysis or presence of bulky groups in ...

    Abstract We report a novel intramolecular 1,6 oxa-Michael addition on substituted dihydropyridines to obtain 5 and 6 member ring lactones in an one-pot reaction starting from activated pyridinyl propenones, without organic catalysis or presence of bulky groups in the Michael acceptor. A marked dependence on the regioselectivity of ring closure was found, dependent on the propenone used.
    Keywords catalytic activity ; lactones ; regioselectivity
    Language English
    Dates of publication 2022-0105
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 204287-3
    ISSN 1873-3581 ; 0040-4039
    ISSN (online) 1873-3581
    ISSN 0040-4039
    DOI 10.1016/j.tetlet.2021.153591
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2837: Show issues Location:
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  9. Article ; Online: Design of Promising Uranyl(VI) Complexes Thin Films with Potential Applications in Molecular Electronics.

    Monzón González, César Raúl / Sánchez Vergara, María Elena / Elías-Espinosa, Milton Carlos / Rodríguez-Valencia, Sergio Arturo / López-Mayorga, Byron José / Castillo-Arroyave, José León / Toscano, Rubén Alfredo / Flores, Octavio Lozada / Álvarez Toledano, Cecilio

    ChemistryOpen

    2024  , Page(s) e202300219

    Abstract: In this work, it is proposed the development of organic semiconductors (OS) based on uranyl(VI) complexes. The above by means of the synthesis and the characterization of the complexes by Infrared spectroscopy, Nuclear magnetic resonance spectroscopy, ... ...

    Abstract In this work, it is proposed the development of organic semiconductors (OS) based on uranyl(VI) complexes. The above by means of the synthesis and the characterization of the complexes by Infrared spectroscopy, Nuclear magnetic resonance spectroscopy, mass spectrometry, and X-ray diffraction. Films of these complexes were deposited and subsequently, topographic and structural characterization was carried out by Scanning Electron Microscopy, X-ray diffraction, and Atomic Force Microscopy. Additionally, the nanomechanical evaluation was performed to know the stiffness of uranyl films using their modulus of elasticity. Also, the optical characterization took place in the devices and their bandgap value ranges between 2.40 and 2.93 eV being the minor for the film of the uranyl complex with the N on pyridine in position 4 (2 c). Finally, the electrical behavior of the uranyl(VI) films was evaluated, and important differences were obtained: the uranyl complex with the N on pyridine in position 2 (2 a) film is not influenced by changes in lighting and its current density is in the order of 10
    Language English
    Publishing date 2024-01-05
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2655605-4
    ISSN 2191-1363 ; 2191-1363
    ISSN (online) 2191-1363
    ISSN 2191-1363
    DOI 10.1002/open.202300219
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Efficient Film Fabrication and Characterization of Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) (PEDOT:PSS)-Metalloporphine Nanocomposite and Its Application as Semiconductor Material.

    Sánchez-Vergara, María Elena / Hamui, Leon / González-Verdugo, Daniela / Cosme, Ismael

    Polymers

    2021  Volume 13, Issue 22

    Abstract: The use of composite films with semiconductor behavior is an alternative to enhance the efficiency of optoelectronic devices. Composite films of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and metalloporphines (MPs; M = Co, Cu, Pd) ...

    Abstract The use of composite films with semiconductor behavior is an alternative to enhance the efficiency of optoelectronic devices. Composite films of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and metalloporphines (MPs; M = Co, Cu, Pd) have been prepared by spin-coating. The PEDOT:PSS-MP films were treated with isopropanol (IPA) vapor to modify the polymer structure from benzoid to quinoid. The quinoid structure promotes improvements in the optical and electrical behavior of films. The composite films' morphology and structure were characterized using infrared and Raman spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM). Composite films were analyzed for their optical behavior by ultraviolet-visible spectroscopy: at λ < 450 nm, the films become transparent, indicating the capacity to be used as transparent electrodes in optoelectronic devices. At λ ≥ 450 nm, the absorbance in the films increased significantly. The CoP showed an 8 times larger current density compared to the CuP. A light induced change in the J-V curves was observed, and it is larger for the CoP. The conductivity values yielded between 1.23 × 10
    Language English
    Publishing date 2021-11-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym13224008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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