Thickness-Driven Orthorhombic to Triclinic Phase Transformation in Pentacene Thin Films

Pentacene films are thermally evaporated onto amorphous carbon‐coated mica substrates held at room temperature. The crystal structure and morphology of the films are analyzed using electron microscopy and diffraction, and a new orthorhombic structure is characterized for films below a critical thick...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2005-04, Vol.17 (7), p.903-907
Main Authors: Drummy, L. F., Martin, D. C.
Format: Article
Language:English
Subjects:
Electro-optical materials
Electronics
Phase-change materials
Thin films
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Summary:Pentacene films are thermally evaporated onto amorphous carbon‐coated mica substrates held at room temperature. The crystal structure and morphology of the films are analyzed using electron microscopy and diffraction, and a new orthorhombic structure is characterized for films below a critical thickness (see Figure). Evidence that the orthorhombic structure is thermodynamically stable at low film thickness due to its low (001) surface energy is obtained.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.200400189