M
Martin Knupfer
Researcher at Leibniz Association
Publications - 346
Citations - 10382
Martin Knupfer is an academic researcher from Leibniz Association. The author has contributed to research in topics: Electronic structure & Photoemission spectroscopy. The author has an hindex of 52, co-authored 332 publications receiving 9809 citations. Previous affiliations of Martin Knupfer include University of Minnesota & Leibniz Institute for Neurobiology.
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Exciton binding energies in organic semiconductors
TL;DR: In this article, it was shown that the previously reported values for the exciton binding energy in many organic semiconductors, which differ by more than an order of magnitude, can be consistently rationalized within the framework of the charging energy of the molecular units, with a simple dependence of the binding energy on the length of these units.
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Localized and delocalized electronic states in single-wall carbon nanotubes
TL;DR: In this paper, momentum-dependent measurements of the density response function of bulk samples of purified single-wall nanotubes probed by electron energy loss spectroscopy are presented.
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Tunable Band Gap in Hydrogenated Quasi-Free-Standing Graphene
Danny Haberer,Denis V. Vyalikh,Simone Taioli,Balázs Dóra,Mani Farjam,Jörg Fink,Dmitry Marchenko,Thomas Pichler,Klaus Ziegler,Stefano Simonucci,M. S. Dresselhaus,Martin Knupfer,Bernd Büchner,Alexander Grüneis +13 more
TL;DR: It is shown by angle-resolved photoemission spectroscopy that a tunable gap in quasi-free-standing monolayer graphene on Au can be induced by hydrogenation, and thereby provides a model system to study hydrogen storage in carbon materials.
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Full characterization of the interface between the organic semiconductor copper phthalocyanine and gold
TL;DR: In this article, the authors studied the interface properties of the molecular organic semiconductor copper phthalocyanine (CuPC) on single crystalline as well as polycrystalline Au using photoemission spectroscopy.
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Diameter grouping in bulk samples of single-walled carbon nanotubes from optical absorption spectroscopy
O. Jost,Andre A. Gorbunov,W. Pompe,Thomas Pichler,Rainer Friedlein,Martin Knupfer,M. Reibold,H.-D. Bauer,Lothar Dunsch,Mark S. Golden,Jörg Fink +10 more
TL;DR: In this article, the influence of the synthesis parameters on the mean characteristics of single-wall carbon nanotubes in soot produced by the laser vaporization of graphite has been analyzed using optical absorption spectroscopy.