The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform

Roland Resel - One of the best experts on this subject based on the ideXlab platform.

  • molecular packing analysis of the crystal smectic e phase of a benzothieno Benzothiophene Derivative by a combined experimental computational approach
    Liquid Crystals, 2021
    Co-Authors: Sebastian Hofer, Wolfgang Rao Bodlos, Jiři Novak, Alessandro Sanzone, Luca Beverina, Roland Resel
    Abstract:

    The molecule 2-decyl-7-phenyl[1]benzothieno[3,2-b][1]Benzothiophene has gained a lot of attention since high charge carrier mobility was observed in thin film transistors. Its thermotropic liquid c...

  • molecular packing analysis of the smectic e phase of a benzothieno Benzothiophene Derivative by a combined experimental computational approach
    arXiv: Soft Condensed Matter, 2021
    Co-Authors: Sebastian J Hofer, Wolfgang Rao Bodlos, Jiři Novak, Alessandro Sanzone, Luca Beverina, Roland Resel
    Abstract:

    The molecule 2-decyl-7-phenyl[1]benzothieno[3,2-b][1]Benzothiophene has gained a lot of attention, since high charge carrier mobility was observed in thin film transistors. Its thermotropic liquid crystalline states may play an important role in the thin film formation, since the smectic A and the smectic E phase (SmE) are claimed to be pre-stages of the final bulk structure. To understand the phase diversity, structural characterisation of solution processed thin films are performed by X-ray diffraction in the complete temperature range up to the isotropic state at 240{\deg}C. The diffraction pattern of the SmE phase is analysed in detail. Peak broadening analysis reveals that the crystallographic order across the smectic layers is larger than the order along the smectic layers. A combined experimental and computational approach is used to determine the molecular packing within the SmE phase. It leads to a number of different packing motifs. A comparison of the calculated diffraction pattern with the experimental results reveals that nano-segregation is present within the SmE phase. Energy consideration clearly favours a herringbone arrangement of the aromatic units. The nano-segregation within the SmE phase with herringbone packing of the aromatic units is accompanied with interdigidation of sidechains from neighbouring smectic layers.

  • substrate induced phase of a Benzothiophene Derivative detected by mid infrared and lattice phonon raman spectroscopy
    ChemPhysChem, 2018
    Co-Authors: Benedikt Schrode, Andrew O F Jones, Roland Resel, Natalia Bedoya, Robert Schennach, Yves Geerts, Christian Ruzie, Michele Sferrazza, Aldo Brillante, Tommaso Salzillo
    Abstract:

    The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]Benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.

  • substrate induced phase of a 1 benzothieno 3 2 b Benzothiophene Derivative and phase evolution by aging and solvent vapor annealing
    ACS Applied Materials & Interfaces, 2015
    Co-Authors: Andrew O F Jones, Roland Resel, Yves Geerts, Christian Ruzie, Jolanta Karpinska, Alan R Kennedy, Christian Rothel, Oliver Werzer, Michele Sferrazza
    Abstract:

    Substrate-induced phases (SIPs) are polymorphic phases that are found in thin films of a material and are different from the single crystal or “bulk” structure of a material. In this work, we investigate the presence of a SIP in the family of [1]benzothieno[3,2-b]Benzothiophene (BTBT) organic semiconductors and the effect of aging and solvent vapor annealing on the film structure. Through extensive X-ray structural investigations of spin coated films, we find a SIP with a significantly different structure to that found in single crystals of the same material forms; the SIP has a herringbone motif while single crystals display layered π–π stacking. Over time, the structure of the film is found to slowly convert to the single crystal structure. Solvent vapor annealing initiates the same structural evolution process but at a greatly increased rate, and near complete conversion can be achieved in a short period of time. As properties such as charge transport capability are determined by the molecular structur...

Michele Sferrazza - One of the best experts on this subject based on the ideXlab platform.

  • substrate induced phase of a Benzothiophene Derivative detected by mid infrared and lattice phonon raman spectroscopy
    ChemPhysChem, 2018
    Co-Authors: Benedikt Schrode, Andrew O F Jones, Roland Resel, Natalia Bedoya, Robert Schennach, Yves Geerts, Christian Ruzie, Michele Sferrazza, Aldo Brillante, Tommaso Salzillo
    Abstract:

    The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]Benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.

  • substrate induced phase of a 1 benzothieno 3 2 b Benzothiophene Derivative and phase evolution by aging and solvent vapor annealing
    ACS Applied Materials & Interfaces, 2015
    Co-Authors: Andrew O F Jones, Roland Resel, Yves Geerts, Christian Ruzie, Jolanta Karpinska, Alan R Kennedy, Christian Rothel, Oliver Werzer, Michele Sferrazza
    Abstract:

    Substrate-induced phases (SIPs) are polymorphic phases that are found in thin films of a material and are different from the single crystal or “bulk” structure of a material. In this work, we investigate the presence of a SIP in the family of [1]benzothieno[3,2-b]Benzothiophene (BTBT) organic semiconductors and the effect of aging and solvent vapor annealing on the film structure. Through extensive X-ray structural investigations of spin coated films, we find a SIP with a significantly different structure to that found in single crystals of the same material forms; the SIP has a herringbone motif while single crystals display layered π–π stacking. Over time, the structure of the film is found to slowly convert to the single crystal structure. Solvent vapor annealing initiates the same structural evolution process but at a greatly increased rate, and near complete conversion can be achieved in a short period of time. As properties such as charge transport capability are determined by the molecular structur...

Andrew O F Jones - One of the best experts on this subject based on the ideXlab platform.

  • substrate induced phase of a Benzothiophene Derivative detected by mid infrared and lattice phonon raman spectroscopy
    ChemPhysChem, 2018
    Co-Authors: Benedikt Schrode, Andrew O F Jones, Roland Resel, Natalia Bedoya, Robert Schennach, Yves Geerts, Christian Ruzie, Michele Sferrazza, Aldo Brillante, Tommaso Salzillo
    Abstract:

    The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]Benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.

  • substrate induced phase of a 1 benzothieno 3 2 b Benzothiophene Derivative and phase evolution by aging and solvent vapor annealing
    ACS Applied Materials & Interfaces, 2015
    Co-Authors: Andrew O F Jones, Roland Resel, Yves Geerts, Christian Ruzie, Jolanta Karpinska, Alan R Kennedy, Christian Rothel, Oliver Werzer, Michele Sferrazza
    Abstract:

    Substrate-induced phases (SIPs) are polymorphic phases that are found in thin films of a material and are different from the single crystal or “bulk” structure of a material. In this work, we investigate the presence of a SIP in the family of [1]benzothieno[3,2-b]Benzothiophene (BTBT) organic semiconductors and the effect of aging and solvent vapor annealing on the film structure. Through extensive X-ray structural investigations of spin coated films, we find a SIP with a significantly different structure to that found in single crystals of the same material forms; the SIP has a herringbone motif while single crystals display layered π–π stacking. Over time, the structure of the film is found to slowly convert to the single crystal structure. Solvent vapor annealing initiates the same structural evolution process but at a greatly increased rate, and near complete conversion can be achieved in a short period of time. As properties such as charge transport capability are determined by the molecular structur...

Hong Meng - One of the best experts on this subject based on the ideXlab platform.

  • alkoxy substituted 1 benzothieno 3 2 b 1 Benzothiophene Derivative with improved performance in organic thin film transistors
    Organic Electronics, 2018
    Co-Authors: Shenghui Guo, Imran Murtaza, Jiahui Tan, Junyou Pan, Yitong Guo, Yanan Zhu, Hong Meng
    Abstract:

    Abstract 2-(4-(octyloxy)phenyl)[1]benzothieno[3,2-b][1]Benzothiophene (C8-OPh-BTBT), a liquid crystal material, is designed and successfully synthesized by introducing an alkoxy side chain of BTBT core. The organic thin-film transistors (OTFTs) based on C8-OPh-BTBT are fabricated to investigate the charge transport properties and compare with that of the alkyl side chain substituted semiconductor such as C12-Ph-BTBT. The highest mobility of 8.25 cm2 V−1 s−1 in C8-OPh-BTBT-based OTFTs is obtained when fabricated at a highly ordered Smectic X (X = K or H, SmX) liquid crystal phase, which is attributed to the formation of a bilayer structure of the organic semiconductor. Notably, the mobility of alkyoxy-substituted C8-OPh-BTBT-based OTFTs is much higher than that of alkyl-substituted C12-Ph-BTBT based OTFTs, while decreasing the operating threshold voltage. This study reveals that the introduction of alkoxy side chain of BTBT core is an effective way to alleviate the high threshold voltage and improve the charge mobility, which indicates that C8-OPh-BTBT-based OTFTs have the potential in practical applications.

Christian Ruzie - One of the best experts on this subject based on the ideXlab platform.

  • substrate induced phase of a Benzothiophene Derivative detected by mid infrared and lattice phonon raman spectroscopy
    ChemPhysChem, 2018
    Co-Authors: Benedikt Schrode, Andrew O F Jones, Roland Resel, Natalia Bedoya, Robert Schennach, Yves Geerts, Christian Ruzie, Michele Sferrazza, Aldo Brillante, Tommaso Salzillo
    Abstract:

    The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]Benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.

  • substrate induced phase of a 1 benzothieno 3 2 b Benzothiophene Derivative and phase evolution by aging and solvent vapor annealing
    ACS Applied Materials & Interfaces, 2015
    Co-Authors: Andrew O F Jones, Roland Resel, Yves Geerts, Christian Ruzie, Jolanta Karpinska, Alan R Kennedy, Christian Rothel, Oliver Werzer, Michele Sferrazza
    Abstract:

    Substrate-induced phases (SIPs) are polymorphic phases that are found in thin films of a material and are different from the single crystal or “bulk” structure of a material. In this work, we investigate the presence of a SIP in the family of [1]benzothieno[3,2-b]Benzothiophene (BTBT) organic semiconductors and the effect of aging and solvent vapor annealing on the film structure. Through extensive X-ray structural investigations of spin coated films, we find a SIP with a significantly different structure to that found in single crystals of the same material forms; the SIP has a herringbone motif while single crystals display layered π–π stacking. Over time, the structure of the film is found to slowly convert to the single crystal structure. Solvent vapor annealing initiates the same structural evolution process but at a greatly increased rate, and near complete conversion can be achieved in a short period of time. As properties such as charge transport capability are determined by the molecular structur...