The problem of monitoring the structural and morphological evolutions of thin films of organic molecular materials during their growth by organic molecular beam epitaxy and in the postgrowth stage is addressed here by a combination of in situ optical reflectance anisotropy measurements, ex situ optical and morphological investigations, and theoretical simulation of the material optical response. For alpha-quaterthiophene, a representative material in the class of organic molecular semiconductors, the results show that molecules crystallize in the first stage of growth in metastable structures, even when deposition is carried out at room temperature. In the postdeposition stage, the film structure evolves within a few days to the known equilibrium structure of the low temperature polymorph. When deposition is carried out at low substrate temperatures, an evolution of the film morphology is also demonstrated. (c) 2007 American Institute of Physics.

Campione, M., Borghesi, A., Laicini, M., Sassella, A., Goletti, C., Bussetti, G., et al. (2007). Growth-related properties and postgrowth phenomena in organic molecular thin films. THE JOURNAL OF CHEMICAL PHYSICS, 127(24) [10.1063/1.2814244].

Growth-related properties and postgrowth phenomena in organic molecular thin films

GOLETTI, CLAUDIO;BUSSETTI, GIANLORENZO;CHIARADIA, PIETRO
2007-01-01

Abstract

The problem of monitoring the structural and morphological evolutions of thin films of organic molecular materials during their growth by organic molecular beam epitaxy and in the postgrowth stage is addressed here by a combination of in situ optical reflectance anisotropy measurements, ex situ optical and morphological investigations, and theoretical simulation of the material optical response. For alpha-quaterthiophene, a representative material in the class of organic molecular semiconductors, the results show that molecules crystallize in the first stage of growth in metastable structures, even when deposition is carried out at room temperature. In the postdeposition stage, the film structure evolves within a few days to the known equilibrium structure of the low temperature polymorph. When deposition is carried out at low substrate temperatures, an evolution of the film morphology is also demonstrated. (c) 2007 American Institute of Physics.
2007
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
Anisotropy; Computer simulation; Crystallization; Metastable phases; Molecular beam epitaxy; Reflection; In situ optical reflectance anisotropy measurements; Material optical response; Organic molecular thin films; Postgrowth phenomena; Thin films
Campione, M., Borghesi, A., Laicini, M., Sassella, A., Goletti, C., Bussetti, G., et al. (2007). Growth-related properties and postgrowth phenomena in organic molecular thin films. THE JOURNAL OF CHEMICAL PHYSICS, 127(24) [10.1063/1.2814244].
Campione, M; Borghesi, A; Laicini, M; Sassella, A; Goletti, C; Bussetti, G; Chiaradia, P
Articolo su rivista
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/29583
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact