Growth, morphology and structure of mixed pentacene films
File(s)
Author(s)
Lubert-Perquel, Daphne
Kim, Dong Kuk
Kay, Chris
Robaschik, Peter
Heutz, Sandrine
Type
Journal Article
Abstract
Thin films of pentacene and p-terphenyl were grown via organic molecular beam deposition to enable solid-state dilution of functional molecules (pentacene) in an inert matrix (p-terphenyl) at higher concentrations than permitted by traditional crystal growth methods, such as melts. Growth rates were first optimised for single component films to ensure a precise control over the dopant/host concentrations when the mixed films were deposited. Both thin film and bulk phases can be identified in pentacene growths, with the precise lattice parameters dependent on the deposition rates. The effect on the microstructure, resulting from progressive dilution of pentacene in a p-terphenyl host, was then investigated. Although disorder increases and the crystallite size decreases in the mixture, with a minimum at a 1 : 1 ratio, phase segregation is not observed on the length scale (limit) that can be probed in our measurements. This indicates that the mixed films form homogeneous solid-solutions that may be employed for the investigation of solid-state phenomena. Our methodology can be extended to other compatible host-dopant systems used in optoelectronic and spintronic devices.
Date Issued
2019-01-14
Date Acceptance
2018-11-30
Citation
Journal of Materials Chemistry C, 2019, 7 (2), pp.289-296
ISSN
2050-7526
Publisher
Royal Society of Chemistry
Start Page
289
End Page
296
Journal / Book Title
Journal of Materials Chemistry C
Volume
7
Issue
2
Copyright Statement
©The Royal Society of Chemistry 2019
Subjects
Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Materials Science
Physics
SINGLET EXCITON FISSION
MOLECULAR-BEAM DEPOSITION
TERPHENYL CRYSTAL
FLUORESCENCE
TRANSPORT
POLYMORPHS
Publication Status
Published
Date Publish Online
2018-12-14