NDLI: Charge-transfer crystallites as molecular electrical dopants

Content Provider	PubMed Central
Author	Méndez, Henry Heimel, Georg Winkler, Stefanie Frisch, Johannes Opitz, Andreas Sauer, Katrein Wegner, Berthold Martin, Oehzelt Christian, Röthel Duhm, Steffen Daniel, Többens Koch, Norbert Salzmann, Ingo
Copyright Year	2015
Abstract	Ground-state integer charge transfer is commonly regarded as the basic mechanism of molecular electrical doping in both, conjugated polymers and oligomers. Here, we demonstrate that fundamentally different processes can occur in the two types of organic semiconductors instead. Using complementary experimental techniques supported by theory, we contrast a polythiophene, where molecular p-doping leads to integer charge transfer reportedly localized to one quaterthiophene backbone segment, to the quaterthiophene oligomer itself. Despite a comparable relative increase in conductivity, we observe only partial charge transfer for the latter. In contrast to the parent polymer, pronounced intermolecular frontier-orbital hybridization of oligomer and dopant in 1:1 mixed-stack co-crystallites leads to the emergence of empty electronic states within the energy gap of the surrounding quaterthiophene matrix. It is their Fermi–Dirac occupation that yields mobile charge carriers and, therefore, the co-crystallites—rather than individual acceptor molecules—should be regarded as the dopants in such systems.
Related Links	http://dx.doi.org/10.1038/ncomms9560
Starting Page	8560
File Format	PDF
ISSN	20411723
e-ISSN	20411723
Journal	Nature Communications
Volume Number	6
Language	English
Publisher	Nature Pub. Group
Publisher Date	2015-10-01
Access Restriction	Open
Rights Holder	Nature Pub. Group
Subject Keyword	Biochemistry, Genetics and Molecular Biology(all) Physics and Astronomy(all) Chemistry(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Chemistry Physics and Astronomy Biochemistry, Genetics and Molecular Biology

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