Molecular structure of poly(3-alkyl-thiophenes) investigated by calorimetry and grazing incidence X-ray scattering

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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  • Author: Abad, Jose, Spain

    Centro de Investigacion en Optica y Nanofisica, Universidad de Murcia, Spain

  • Author: Espinosa Martinez, Nieves

    Unknown

  • Author: Ferrer, Pilar, Spain

    SpLine, Spanish CRG beamline at the ESRFacility, Spain

  • Author: García-Valverde, Rafael, Spain

    Departamento de Electrónica, Universidad Politécnica de Cartagena, Spain

  • Author: Miguel, Carmen, Spain

    Departamento de Electrónica, Universidad Politécnica de Cartagena, Spain

  • Author: Padilla, Javier, Spain

    Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Spain

  • Author: Alcolea, Alberto, Spain

    Servicio de Apoyo a la Investigación Tecnológica (SAIT), Universidad Politécnica de Cartagena, Spain

  • Author: Castro, German R., Spain

    SpLine, Spanish CRG beamline at the ESRFacility, Spain

  • Author: Colchero, Jaime, Spain

    Departamento de Física, Centro de Investigacion en Optica y Nanofisica, Universidad de Murcia, Spain

  • Author: Urbina, Antonio, Spain

    Departamento de Electrónica, Universidad Politécnica de Cartagena, Spain

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A study of the molecular structure of regio-regular bulk poly-3-octyl-thiophene (P3OT) and poly-3-hexyl-thiophene (P3HT) and the phase transitions during heating and cooling scans in a temperature range of –158–773°C has been performed by means of calorimetry of bulk samples and grazing incidence X-ray diffraction from synchrotron radiation. Additional calorimetric measurements were performed on samples in toluene solution. From the calorimetric temperature diagrams at different scan rates, we obtain the melting and crystallization temperatures, and we identify a low temperature calorimetric glass transition. This transition is expected because of the coexistence of amorphous and crystalline phases, which is further supported by scanning force microscopy images where lamellar structures have been observed. Thin films of both polymers have also been studied by grazing incidence X-ray diffraction, and the evolution of the (100) crystalline peak monitored as a function of sample temperature, showing different behavior in both polymers, d-spacing increases in P3HT and decreases in P3OT for increasing temperatures. The information presented in this article will be useful to design fabrication techniques for organic-based electronic devices, which could include high and low temperature cycles combined with structural quenching procedures.
Original languageEnglish
JournalSolar Energy Materials & Solar Cells
Publication date2012
Volume97
Pages109-118
ISSN0927-0248
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 3
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