Publication details

Annealing Behavior with Thickness Hindered Nucleation in Small-Molecule Organic Semiconductor Thin Films

Authors

ROZBOŘIL Jakub BROCH Katharina RESEL Roland CAHA Ondřej MÜNZ Filip MIKULÍK Petr ANTHONY John E. SIRRINGHAUS Henning NOVÁK Jiří

Type Article in Periodical
Magazine / Source CRYSTAL GROWTH & DESIGN
MU Faculty or unit

Faculty of Science

Citation
WWW URL of the publication
Doi http://dx.doi.org/10.1021/acs.cgd.9b00213
Keywords ANTHRADITHIOPHENE; organic semiconductors; CRYSTALLIZATION; nucleation; POLYMORPHISM; X-ray diffraction; optical spectroscopy; FIELD-EFFECT TRANSISTORS; PERFORMANCE; annealing; thin films
Description We introduce a comprehensive overview of spontaneous and thermal induced structure changes in thin films of the high performance small-molecular organic semiconductor 5,11-bis(triethyl silylethynyl) anthradithiophene (TES-ADT). Most importantly, we find that nucleation of the TES-ADT high temperature beta phase can be induced only for films thicker than a critical thickness, while it is hindered for thinner films. The described limited crystal phase nucleation, the circumstances of which are unique in the realm of small-molecule organic semiconductors, is explained in terms of a two step nucleation mechanism while taking into account the anisotropic surface energy of crystal grains. Furthermore, we identify changes in the optical absorption spectra observed during aging of as deposited films with a spontaneous transformation from the amorphous phase to the alpha(2) phase via the alpha(1) phase of TES-ADT. The transformation takes place on the time scale of several days. Finally, we determine temperature dependence of lattice parameters of the alpha(1) and alpha(2) phases and the lattice parameters of the beta phase. Thermal expansion of the alpha(1) phase is found to be much lower than that of the alpha(2) phase.
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