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Effect of the spacer group nature on the optical and electrical properties of confined poly(p-phenylene vinylene) derivatives

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Abstract

This study is an investigation about the effect of chemical modification on the morphological, optical and electrical properties of semiconducting organic thin films. Two confined poly(p-phenylene vinylene) (PPV)-type polymers containing different spacer groups were studied: P1 has an isopropylidene spacer group and P2 with hexafluoroisopropylidene spacer. The UV–Vis absorption and PL analysis showed a stronger π–π interaction in the P1 film; in P2, the π-stacking is limited by the introduction of a bulky trifluoromethyl (CF3) groups on the spacer units. The P2 exhibits a better film quality as illustrated by the atomic force microscopy. The HOMO and LUMO energy levels and electrochemical band gap of the polymers were determinate by the cyclic voltammetry. The electrical properties of ITO/PPV derivative/Al diodes were investigated by means of current–voltage and show a space-charge-limited current conduction mechanism with higher mobility in the P2 thin layer. The impedance spectra of the devices can be discussed in terms of an equivalent circuit model designed as a parallel resistance (R p) and capacitance (C p) network in series with a resistance.

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Authors and Affiliations

  1. Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia

    Maha Benzarti-Ghédira, Imen Zahou, Haikel Hrichi, Nejmeddine Jaballah, Rafik Ben Chaâbane, Mustapha Majdoub & Hafedh Ben Ouada

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  1. Maha Benzarti-Ghédira
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Correspondence to Maha Benzarti-Ghédira.

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Benzarti-Ghédira, M., Zahou, I., Hrichi, H. et al. Effect of the spacer group nature on the optical and electrical properties of confined poly(p-phenylene vinylene) derivatives. Appl. Phys. A 120, 897–908 (2015). https://doi.org/10.1007/s00339-015-9218-9

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