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@article{1322881,
author = {Dieterle, Johannes and Broch, Katharina and Hinderhofer, Alexander and Frank, Heiko and Novák, Jiří and Gerlach, Alexander and Breuer, Tobias and Banerjee, Rupak and Witte, Gregor and Schreibert, Frank},
article_location = {Washington D.C.},
article_number = {47},
doi = {http://dx.doi.org/10.1021/acs.jpcc.5b08866},
keywords = {organic semiconductors; picene; pentacene; perfluoropentacene; molecular blends; structural analysis; X-ray diffraction; limited intermixing; molecular superlattice},
language = {eng},
issn = {1932-7447},
journal = {Journal of Physical Chemistry C},
title = {Structural Properties of Picene-Perfluoropentacene and Picene-Pentacene Blends: Super lattice Formation versus Limited Intermixing},
url = {http://pubs.acs.org/doi/10.1021/acs.jpcc.5b08866},
volume = {119},
year = {2015}
}
TY - JOUR
ID - 1322881
AU - Dieterle, Johannes - Broch, Katharina - Hinderhofer, Alexander - Frank, Heiko - Novák, Jiří - Gerlach, Alexander - Breuer, Tobias - Banerjee, Rupak - Witte, Gregor - Schreibert, Frank
PY - 2015
TI - Structural Properties of Picene-Perfluoropentacene and Picene-Pentacene Blends: Super lattice Formation versus Limited Intermixing
JF - Journal of Physical Chemistry C
VL - 119
IS - 47
SP - 26339-26347
EP - 26339-26347
PB - American Chemical Society
SN - 19327447
KW - organic semiconductors
KW - picene
KW - pentacene
KW - perfluoropentacene
KW - molecular blends
KW - structural analysis
KW - X-ray diffraction
KW - limited intermixing
KW - molecular superlattice
UR - http://pubs.acs.org/doi/10.1021/acs.jpcc.5b08866
L2 - http://pubs.acs.org/doi/10.1021/acs.jpcc.5b08866
N2 - The structure and morphology of mixed thin films of picene (C22H14, PIC) and perfluoropentacene (C22F14, PFP) as well as mixed thin films of PIC and pentacene (C22H14, PEN) grown by simultaneous coevaporation is investigated using X-ray diffraction, atomic force microscopy, and near-edge X-ray absorption spectroscopy. For both systems we find mixing on the molecular level and the formation of mixed structures. However, due to the strongly different interactions in both mixtures the ordering is fundamentally different. For the equimolar PFP:PIC mixtures, we observe the formation of two different mixed polymorphs with unit cells containing 2 PIC and 2 PFP molecules depending on the growth temperature. One of these polymorphs is a superlattice with in-plane compound segregation. The other polymorph is less symmetric and results only in a very short ranged in-plane ordering. In contrast, the PEN:PIC mixtures form crystals with unit cell parameters continuously changing with the molar concentrations between those of the pure compounds. The position of molecular species within the crystal lattice is statistical. Surprisingly, for higher concentrations of PIC we observe phase separation of surplus PIC molecules which corresponds to a limited intermixing of the two compounds. Finally, the results are discussed in the context of other organic semiconductor binary mixtures showing that besides chemical composition and steric compatibility the intramolecular arrangement of the atoms important for intermolecular interactions significantly influences the structure formation in organic semiconductor blends.
ER -
DIETERLE, Johannes, Katharina BROCH, Alexander HINDERHOFER, Heiko FRANK, Jiří NOVÁK, Alexander GERLACH, Tobias BREUER, Rupak BANERJEE, Gregor WITTE and Frank SCHREIBERT. Structural Properties of Picene-Perfluoropentacene and Picene-Pentacene Blends: Super lattice Formation versus Limited Intermixing. \textit{Journal of Physical Chemistry C}. Washington D.C.: American Chemical Society, 2015, vol.~119, No~47, p.~26339-26347. ISSN~1932-7447. Available from: https://dx.doi.org/10.1021/acs.jpcc.5b08866.
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