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Poster De Conférence Année : 2021

New liquid-crystalline semiconducting (PBTTT)-based polymer : from synthesis to organic field-effect transistor properties

Résumé

π–Conjugated macromolecules have attracted much attention due particularly to their semi-conducting properties which explain their integration into organic electronic devices, such as organic light-emitting diodes (OLEDs)[1], organic photovoltaic cells (OPVs)[2] and organic field-effect transistors (OFETs)[3]. In this field, one challenge is to improve the device performances, one way being to get higher charge carrier mobility. Such enhancement can be obtained in preparing ordered materials able to form highly organized thin film morphologies from solution processing[4]. On the one hand, Poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophenes)(PBTTT) derivatives demonstrated high charge carrier mobilities and are efficient materials for OFET elaboration. On the other hand, triphenylene-based discotic mesogens can spontaneously self-organize to give columnar nanostructures by the stacking of their polyaromatic cores, providing an efficient pathway for a unidirectional charge carrier transport along the column[5]. In this context, herein we designed and prepared a new macromolecular architecture based on PBTTT polymer chain as backbone and triphenylene mesogens as side groups. The obtained polymer (PBTTT-Tri) was characterized by appropriate analytical techniques (1H NMR, 13C NMR and SEC) and its thermal behavior was studied by Polarized Optical Microscopy (POM) and Differential Scanning Calorimetry (DSC). The self-organization property of PBTTT-Tri was investigated by temperature dependent Small-angle X-ray Scattering (SAXS) and Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS). The results showed that the material presents a lamellar-columnar arrangement that can be oriented on surfaces. Moreover, the preliminary charge transport properties of PBTTT-Tri in thin films were examined in OFET configuration, and a p-type conduction with a hole mobility around 1.2 x 10-5 cm2 V-1 s-1 was observed.

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Dates et versions

hal-04423685 , version 1 (29-01-2024)

Identifiants

  • HAL Id : hal-04423685 , version 1

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Dizheng Liu, Lydia Sosa-Vargas, David Kreher, Fabrice Mathevet. New liquid-crystalline semiconducting (PBTTT)-based polymer : from synthesis to organic field-effect transistor properties. 10th international conference on molecular electronics (ELECMOL), Nov 2021, Lyon, France. . ⟨hal-04423685⟩
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