Here, we applied rubbing on thiophene-basedorganic semiconductor thin films to induce a reversible mechanical amorphisation. Amorphisation is associated with fluorescence switching, which is regulated by the polymorphic nature of the film. Thermal annealing of rubbed films produces an opposite effect with respect to rubbing, inducing film crystallization. Notably, thermal crystallisation starts at a low temperature but generates the polymorph stable at a high temperature in the bulk. The mechanism of mechanical transformation is explained considering the mechanical properties of the material and demonstrated through combined X-ray diffraction, atomic force microscopy and photoluminescence at confocal microscopy.

Rubbing induced reversible fluorescence switching in thiophene-based organic semiconductor films by mechanical amorphisation

Cavallini Massimiliano;Manet Ilse;Brucale Marco;Favaretto Laura;Melucci Manuela;Liscio Fabiola;della Ciana Michele;Gentili Denis
Ultimo
2021

Abstract

Here, we applied rubbing on thiophene-basedorganic semiconductor thin films to induce a reversible mechanical amorphisation. Amorphisation is associated with fluorescence switching, which is regulated by the polymorphic nature of the film. Thermal annealing of rubbed films produces an opposite effect with respect to rubbing, inducing film crystallization. Notably, thermal crystallisation starts at a low temperature but generates the polymorph stable at a high temperature in the bulk. The mechanism of mechanical transformation is explained considering the mechanical properties of the material and demonstrated through combined X-ray diffraction, atomic force microscopy and photoluminescence at confocal microscopy.
2021
Istituto per la Sintesi Organica e la Fotoreattivita' - ISOF
Istituto per lo Studio dei Materiali Nanostrutturati - ISMN
Istituto per la Microelettronica e Microsistemi - IMM
thin films
polymorphism
luminescence
mechanochemistry
crystals
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Descrizione: Rubbing induced reversible fluorescence switching in thiophene-based organic semiconductor films by mechanical amorphisation
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/418163
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