http://www.cnr.it/ontology/cnr/individuo/prodotto/ID260557

Continuous tuning of the mechanical sensitivity of Pentacene OTFTs on flexible substrates: From strain sensors to deformable transistors (Articolo in rivista)

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Continuous tuning of the mechanical sensitivity of Pentacene OTFTs on flexible substrates: From strain sensors to deformable transistors (Articolo in rivista) (literal)

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Cosseddu P. [ 1,2 ] ; Tiddia G. [ 1 ] ; Milita S. [ 3 ] ; Bonfiglio A. [ 1,2 ] (2013)
Continuous tuning of the mechanical sensitivity of Pentacene OTFTs on flexible substrates: From strain sensors to deformable transistors
in Organic electronics (Print); ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
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Cosseddu P. [ 1,2 ] ; Tiddia G. [ 1 ] ; Milita S. [ 3 ] ; Bonfiglio A. [ 1,2 ] (literal)

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[ 1 ] Univ Cagliari, Dept Elect & Elect Engn, I-09123 Cagliari, Italy [ 2 ] CNR, Inst Nanosci, Ctr S3, I-41100 Modena, Italy [ 3 ] CNR IMM, Ist Microelettr & Microsistemi, I-40129 Bologna, Italy (literal)

Titolo

Continuous tuning of the mechanical sensitivity of Pentacene OTFTs on flexible substrates: From strain sensors to deformable transistors (literal)

Abstract

The aim of this work is to contribute to establish whether morphological properties prevail over crystal lattice organization in determining the cause for the observed sensitivity of organic semiconductors to mechanical deformations in Organic Thin Film Transistors (OTFTs). To this aim, the morphology of the active layer (made by Pentacene) of OTFTs fabricated on flexible substrates was intentionally modified by properly changing the deposition rate. By comparing Atomic Force Microscopy (AFM), X-ray Diffraction (XRD) investigations and the electrical characterization of the devices, we can conclude that sensitivity is clearly dominated by morphological rather than lattice effects. In addition, these results suggest a simple method for obtaining, in devices based on evaporated small molecules, a fine tuning of the sensitivity to mechanical deformation that could be predictably adjusted in a range that goes from a minimum, practically negligible, value, desirable for applications in flexible electronic circuitry, to a maximum extent, useful for mechanical sensing applications (literal)

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