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Polymorphic crystalline microfibers from an achiral octithiophene with one S‐hexyl substituent per ring are separately and reproducibly grown with the same characteristics on various solid surfaces, including the interdigitated electrodes/SiO2 surface of a bottomcontact field‐effect transistor. The arrangement of the same molecule in two diverse supramolecular structures leads to markedly different electronic, optical, and charge mobility properties. The microfibers—straight and yellow emitting or helical and red emitting—exhibit p‐type charge transport characteristics, with the yellow ones showing a charge mobility and on/off current ratio of one and three orders of magnitude, respectively, greater than the red ones. Both forms show circular dichroism signals with significant differences from one form to the other. DFT calculations show that the octithiophene exists in two different quasi‐equienergetic conformations …
Publication date: 
1 Aug 2014

Francesca Di Maria, Eduardo Fabiano, Denis Gentili, Mariano Biasiucci, Tommaso Salzillo, Giacomo Bergamini, Massimo Gazzano, Alberto Zanelli, Aldo Brillante, Massimiliano Cavallini, Fabio Della Sala, Giuseppe Gigli, Giovanna Barbarella

Biblio References: 
Volume: 24 Issue: 31 Pages: 4943-4951
Advanced Functional Materials