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Crystals 2016, 6(4), 41; doi:10.3390/cryst6040041

Raman Identification of Polymorphs in Pentacene Films

1
Dipartimento di Chimica & INSTM UdR Parma, Università di Parma, Parco Area delle Scienze 17/a, I-43124 Parma, Italy
2
Dipartimento di Chimica Indutriale “Toso Montanari” & INSTM UdR Bologna, Università di Bologna, viale Risorgimento 4, I-40136 Bologna, Italy
3
IMEM-CNR Trento, Istituto Materiali per Elettronica e Magnetismo-Consiglio Nazionale Ricerche, Via Alla Cascata 56/C, I-38123 Trento, Italy
4
IMEM-CNR Parma, Istituto Materiali per Elettronica e Magnetismo-Consiglio Nazionale Ricerche, Parco dArea delle Scienze, I-43124 Parma, Italy
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Helmut Cölfen
Received: 21 January 2016 / Revised: 10 March 2016 / Accepted: 5 April 2016 / Published: 8 April 2016
(This article belongs to the Section Biomolecular Crystals)
View Full-Text   |   Download PDF [973 KB, uploaded 8 April 2016]   |  

Abstract

We use Raman spectroscopy to characterize thin films of pentacene grown on Si/SiO x by Supersonic Molecular Beam Deposition (SuMBD). We find that films up to a thickness of about 781 Å (∼ 52 monolayers) all belong to the so-called thin-film (TF) phase. The appearance with strong intensity of some lattice phonons suggests that the films are characterized by good intra-layer order. A comparison of the Raman spectra in the lattice and CH bending spectral regions of the TF polymorph with the corresponding ones of the high-temperature (HT) and low-temperature (LT) bulk pentacene polymorphs provides a quick and nondestructive method to identify the different phases. View Full-Text
Keywords: pentacene; polymorphism; raman spectroscopy pentacene; polymorphism; raman spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Girlando, A.; Masino, M.; Brillante, A.; Toccoli, T.; Iannotta, S. Raman Identification of Polymorphs in Pentacene Films. Crystals 2016, 6, 41.

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