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Supramolecular Order of Solution‐Processed Perylenediimide Thin Films: High‐Performance Small‐Channel n‐Type Organic Transistors
Author(s) -
Fabiano Simone,
Wang He,
Piliego Claudia,
Jaye Cherno,
Fischer Daniel A.,
Chen Zhihua,
Pignataro Bruno,
Facchetti Antonio,
Loo YuehLin,
Loi Maria Antonietta
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201101427
Subject(s) - materials science , stacking , intermolecular force , xanes , molecule , supramolecular chemistry , chemical physics , crystallography , spectroscopy , nanotechnology , organic chemistry , chemistry , physics , quantum mechanics
N,N ′‐1 H ,1 H ‐perfluorobutyl dicyanoperylenecarboxydiimide (PDIF‐CN 2 ), a soluble and air stable n‐type molecule, undergoes significant reorganization upon thermal annealing after solution deposition on several substrates with different surface energies. Interestingly, this system exhibits an exceptional edge‐on orientation regardless of the substrate chemistry. This preferential orientation is rationalized in terms of strong intermolecular interactions between the PDIF‐CN 2 molecules. The presence of a pronounced π–π stacking is confirmed by combining near‐edge X‐ray absorption fine structure spectroscopy (NEXAFS), dynamic scanning force microscopy (SFM) and surface energy measurements. The remarkable charge carrier mobility measured in field‐effect transistors, using both bottom‐ and top‐contact (bottom‐gate) configurations, underlines the importance of strong intermolecular interactions for the realization of high performing devices.