Abstract

Nowadays considerable efforts are devoted to the synthesis of low bandgap conjugated polymers forapplication in organic polymer solar cells. A large variety of low bandgap polymers are prepared byalternating copolymerization of electron-donating donor and electron-withdrawing acceptor units. Theinteraction between these two units can reduce the polymer bandgap, increasing the sunlight absorption.Benzothiadiazole is commonly used as acceptor block unit in low bandgap polymers. In this contributionwe investigate the supramolecular organization and optical properties of thin films of conjugated polymersconsisting of benzothiadiazole and thiophene with electron-withdrawing difluorovinylene, andelectron-donating vinylene substituents. Atomic force microscopy and spectroscopic ellipsometry areexploited for the analysis of the morphology and optical transitions, respectively. It is found that F-atomsin the vinylene unit yield a blue-shift of the absorption peaks of 0.2 eV respect to the hydrogenated polymerand an increase in the absorption coefficient of fluorinated polymers, which indicates their potentialapplication as photovoltaic material. The morphology evolution of the conjugated polymers blended witha fullerene derivate ([6,6]-phenyl C61-butyric acid methyl ester, PCBM) is also investigated by atomic forcemicroscopy.

Autore Pugliese

• Losurdo Maria , Giangregorio Maria Michela , Cardone Antonio

Tutti gli autori

• Dilonardo E.; Cardone A.; Martinelli C.; Giangregorio M.M.; Losurdo M.;Capezzuto P.; Farinola G.M.; Babudri F.; Naso F.; Bruno G.

Titolo volume/Rivista

Synthetic metals

Anno di pubblicazione

2012

ISSN

0379-6779

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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