G
Georg Heimel
Researcher at Humboldt University of Berlin
Publications - 64
Citations - 4737
Georg Heimel is an academic researcher from Humboldt University of Berlin. The author has contributed to research in topics: Organic semiconductor & Self-assembled monolayer. The author has an hindex of 32, co-authored 64 publications receiving 4139 citations. Previous affiliations of Georg Heimel include Helmholtz-Zentrum Berlin & Graz University of Technology.
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Journal ArticleDOI
Orientation-dependent ionization energies and interface dipoles in ordered molecular assemblies
Steffen Duhm,Georg Heimel,Ingo Salzmann,Hendrik Glowatzki,Robert L. Johnson,Antje Vollmer,Jürgen P. Rabe,Norbert Koch +7 more
TL;DR: This study reveals the existence of a surface dipole built into molecular layers and offers design guidelines for improved organic-organic heterojunctions, hole- or electron-blocking layers and reduced barriers for charge-carrier injection in organic electronic devices.
Journal ArticleDOI
Molecular Electrical Doping of Organic Semiconductors: Fundamental Mechanisms and Emerging Dopant Design Rules
Ingo Salzmann,Georg Heimel,Martin Oehzelt,Stefanie Winkler,Norbert Koch,Norbert Koch,Norbert Koch +6 more
TL;DR: An improved understanding is required of just how the admixture of dopant molecules to organic semiconductors does affect the density of states, and how this will provide viable guidelines for synthetic and supramolecular chemistry that will enable further technological advances in organic and hybrid organic/inorganic devices.
Journal ArticleDOI
Organic semiconductor density of states controls the energy level alignment at electrode interfaces.
TL;DR: The shape and the energy distribution of electronic states tailing into the fundamental gap is found to determine both the minimum value of practically achievable injection barriers as well as their spatial profile, ranging from abrupt interface dipoles to extended band-bending regions.
Journal ArticleDOI
Charge-transfer crystallites as molecular electrical dopants
H. Méndez,Georg Heimel,Stefanie Winkler,Stefanie Winkler,Johannes Frisch,Johannes Frisch,Andreas Opitz,Katrein Sauer,Berthold Wegner,Martin Oehzelt,Martin Oehzelt,Christian Röthel,Steffen Duhm,Daniel M. Többens,Norbert Koch,Norbert Koch,Norbert Koch,Ingo Salzmann +17 more
TL;DR: It is demonstrated that fundamentally different processes can occur in the two types of organic semiconductors instead of ground-state integer charge transfer as the basic mechanism of molecular electrical doping in both, conjugated polymers and oligomers.
Journal ArticleDOI
Doping of Organic Semiconductors: Impact of Dopant Strength and Electronic Coupling
H. Méndez,Georg Heimel,Andreas Opitz,Katrein Sauer,Patrick Barkowski,Martin Oehzelt,Martin Oehzelt,Junshi Soeda,Toshihiro Okamoto,Jun Takeya,Jean-Baptiste Arlin,Jean-Yves Balandier,Yves Geerts,Norbert Koch,Norbert Koch,Ingo Salzmann +15 more
TL;DR: By systematically varying the acceptor strength it was possible to discriminate the two models of molecular doping, suggesting strategies for the chemical design of more efficient molecular dopants.