13,6-N-Sulfinylacetamidopentacene (SAP) has been transferred on solid substrates both by water-rich environment and organic solvents without altering his chemical structure. Thermal conversion of SAP to pentacene leads to crystals showing similar features of vacuum-sublimated pentacene both in the bulk and thin-film phases. The thin-film phase is strongly affected by the substrate surface properties. Low energy Si-CH3 rich surfaces allow for the formation of compact micrometric crystals following a Volmer-Weber like growth with orientation suitable for field-effect carrier mobility. Screw dislocations along with straight edges are found on these systems as an indication of a loose interlayer interaction with respect to the lateral pi-pi intermolecular forces. In contrast, higher energy SiOH rich surfaces result in non-compact systems (Stransky-Krastanov like growth) arising by in-space randomly oriented crystals as well as by individual screw dislocations. (C) 2007 Elsevier B.V. All rights reserved.

Surface effects on the growth of solution processed pentacene thin films

Antonino Scandurra
Investigation
;
Giuseppe F. Indelli;Bruno Pignataro
2008

Abstract

13,6-N-Sulfinylacetamidopentacene (SAP) has been transferred on solid substrates both by water-rich environment and organic solvents without altering his chemical structure. Thermal conversion of SAP to pentacene leads to crystals showing similar features of vacuum-sublimated pentacene both in the bulk and thin-film phases. The thin-film phase is strongly affected by the substrate surface properties. Low energy Si-CH3 rich surfaces allow for the formation of compact micrometric crystals following a Volmer-Weber like growth with orientation suitable for field-effect carrier mobility. Screw dislocations along with straight edges are found on these systems as an indication of a loose interlayer interaction with respect to the lateral pi-pi intermolecular forces. In contrast, higher energy SiOH rich surfaces result in non-compact systems (Stransky-Krastanov like growth) arising by in-space randomly oriented crystals as well as by individual screw dislocations. (C) 2007 Elsevier B.V. All rights reserved.
pentacene precursor
solution deposition
crystal growth
Langmuir-Blodgett
spin-coating
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/534750
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