Dicyanoperylene-diimide thin-film growth: a combined optical and morphological study
Anno: 2011
Autori: Chiarella F., Barra M., Cassinese A., Di Girolamo F.V., Maddalena P., Santamaria L., Lettieri S.
Affiliazione autori: Istituto superconduttori, materiali innovativi e dispositivi SPIN CNR; Dipartimento di Scienze Fisiche, Università di Napoli “Federico II”
Abstract: N,N\’-bis (n-octyl)-dicyanoperylene-3,4:9,10-bis(dicarboximide) (PDI8-CN2) molecules represent an important example of novel n-type organic materials for realization of air-stable n-channel organic thin film transistors. In this work, the growth by evaporation of PDI8-CN2 thin films deposited on silicon/silicon dioxide substrates has been investigated as a function of the film thickness through the combination of optical and morphological analyses. A continuous transition from two-dimensional to three-dimensional growth is observed at increasing thickness, accompanied by a modification of the photoluminescence spectrum of the films. Correlations between morphology and optical emission (photoluminescence) of the films are evidenced: namely, an emission band, red shifted with respect to the excitonic transition, emerges at increasing thickness. Time-resolved photoluminescence analysis demonstrates that the decay kinetics of such a band is different from the one associated with exciton recombination. Such a feature may thus represent a useful signature of defect-related trap states.
Giornale/Rivista: APPLIED PHYSICS. A, MATERIALS SCIENCE & PROCESSING (PRINT)
Volume: 104 (1) Da Pagina: 39 A: 46
Parole chiavi: photoluminescenceDOI: 10.1007/s00339-010-6164-4Citazioni: 14dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-05Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui