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    Surface effects on the growth of solution processed pentacene thin films

    Year: 2008

    Journal: Surface Science, Volume 602, Issue 4, 15 February 2008, Pages 993-1005, 20111221

    Authors: Chiara Musumeci, Claudia Cascio, Antonino Scandurr, Giuseppe F. Indelli, Corrado Bongiorno, Sebastiano Ravesi, and Bruno Pignataro

    Organizations: PLAST_ICs, Stradale Primosole 50, 95121 Catania, Italy, Superlab-Consorzio Catania Ricerche, Stradale Primosole 50, 95121 Catania, Italy, Istituto per la Microelectronica e Microsistemi (IMM), Stradale Primosole 50, 95121 Catania, Italy, ST-Microelectronics, Stradale Primosole 50, 95121 Catania, Italy, Dipartimento di Chimica Fisica F. Accascina, Università di Palermo, V.le delle Scienze, Parco D’Orleans II, 90128 Palermo, Italy

    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 π–π 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.