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Klaus Kern

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Related publications (299)

Tertiary Chiral Domains Assembled by Achiral Metal-Organic Complexes on Cu(110)

We report on the formation of chiral domains self-assembled from terephthalic acid (TPA) and iron on a Cu(110) surface. Using scanning tunnelling microscopy, we observe that the supramolecular structures are organized on successive hierarchical levels. Chi ...

2010

Actuated Transitory Metal-Ligand Bond As Tunable Electromechanical Switch

Klaus Kern

Electrically tunable molecules are highly attractive for the construction of molecular devices, such as switches, transistors, or machines. Here, we present a novel nanomechanical element triggered by an electrical bias as external stimulus. We demonstrate ...

American Chemical Society (ACS)2010

Structural Analysis and Electronic Properties of Negatively Charged TCNQ: 2D Networks (TCNQ)(2)Mn Assembled on Cu(100)

Klaus Kern, Tzu-Chun Tseng

A compound two-dimensional monolayer mixing Mn atoms and 7,7,8,8-tetracyanoquinoclimethane (TCNQ) molecules was synthesized by supramolecular assembly on a Cu(100) surface under ultrahigh-vacuum conditions. The interactions in the Mn(TCNQ)(2) network and i ...

2010

Electrical Properties and Photoconductivity of Stacked-Graphene Carbon Nanotubes

Klaus Kern, Marko Burghard, Eduardo Jian Hua Lee

Stacked-graphene carbon nanotubes (SG-CNTs) obtained via pyrolysis of columnar superstructures of polycyclic aromatic hydrocarbons are studied by electrical transport measurements and scanning photocurrent microscopy. The charge transport in individual SG- ...

Wiley2010

Surface plasmon coupling to nanoscale Schottky-type electrical detectors

Klaus Kern, Marko Burghard, Thomas Dufaux

We have investigated the near-field coupling of surface plasmons to a titanium/CdS nanowire interface for two different device configurations. A bare aluminum grating on an underlying aluminum layer exhibited the expected stronger electrical signal for per ...

AIP American Institute of Physics2010

Logic circuits based on individual semiconducting and metallic carbon-nanotube devices

Klaus Kern, Ralf Thomas Weitz, Frederik Sebastian Ante, Hagen Klauk

Nanoscale transistors employing an individual semiconducting carbon nanotube as the channel hold great potential for logic circuits with large integration densities that can be manufactured on glass or plastic substrates. Carbon nanotubes are usually produ ...

2010

Reversing the shape transition of InAs/GaAs (001) quantum dots by etching-induced lateral In segregation

Klaus Kern, Theresa Lutz, Giovanni Costantini

The shape evolution of epitaxially grown InAs/GaAs(001) quantum dots after the controlled removal of material by an in situ etching gas is investigated by atomic force and scanning tunneling microscopy. The presence of {137} facets on the surface of partia ...

2010

Towards the Isomer-Specific Synthesis of Higher Fullerenes and Buckybowls by the Surface-Catalyzed Cyclodehydrogenation of Aromatic Precursors

Klaus Kern, Sebastian Stepanow, Stephan Rauschenbach, Nasiba Abdurakhmanova

Wiley-VCH Verlag GmbH2010

Structural influence on the Rashba-type spin splitting in surface alloys

Klaus Kern, Isabella Gierz, Jan Hugo Dil

The Bi/Ag(111), Pb/Ag(111), and Sb/Ag(111) surface alloys exhibit a two-dimensional band structure with a strongly enhanced Rashba-type spin splitting, which is in part attributed to the structural asymmetry resulting from an outward relaxation of the allo ...

2010

Electronic decoupling of an epitaxial graphene monolayer by gold intercalation

Klaus Kern, Ralf Thomas Weitz, Isabella Gierz

The application of graphene in electronic devices requires large-scale epitaxial growth. The presence of the substrate, however, usually reduces the charge-carrier mobility considerably. We show that it is possible to decouple the partially sp(3)-hybridize ...

2010

Electroluminescence from Individual Pentacene Nanocrystals

Klaus Kern, Alexander Kabakchiev, Theresa Lutz

2010

Inelastic electron tunneling spectroscopy: A route to the identification of the tip-apex structure

Klaus Kern

The vibrational spectrum of a tunneling junction on a clean Cu(111) surface has been characterized by vibrational density of states calculations and inelastic electron tunneling spectroscopy technique. We demonstrate that the achieved spectrum consists not ...

2010

Gate dependent photocurrents at a graphene p-n junction

Klaus Kern, Marko Burghard, Eduardo Jian Hua Lee, Eva Carmen Peters

We have used scanning photocurrent microscopy to explore the electronic characteristics of a graphene p-n junction fabricated by local chemical doping of a graphene sheet. The photocurrent signal at the junction was found to be most prominent for gate volt ...

AIP American Institute of Physics2010

Charge-transfer-induced structural rearrangements at both sides of organic/metal interfaces

Klaus Kern, Alexander Langner, Tzu-Chun Tseng, Yang Wang

Organic/metal interfaces control the performance of many optoelectronic organic devices, including organic light-emitting diodes or field-effect transistors. Using scanning tunnelling microscopy, low-energy electron diffraction, X-ray photoemission spectro ...

2010

Flexible Low-Voltage Organic Transistors and Circuits Based on a High-Mobility Organic Semiconductor with Good Air Stability

Klaus Kern, Frederik Sebastian Ante, Hagen Klauk

Flexible transistors and circuits based on dinaphtho-[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT), a conjugated semiconductor with a large ionization potential (5.4 eV), are reported. The transistors have a mobility of 0.6 cm(2) V-1 s(-1) and the ring osci ...

Wiley2010

Grafting Crown Ether Alkali Host-Guest Complexes at Surfaces by Electrospray Ion Beam Deposition

Klaus Kern, Stephan Rauschenbach, Nicha Thontasen

The functionalization of surfaces with host guest compounds is promising for many applications, yet often limited by constraints such as the volatility of the functional compound or the lack of binding to the surface. We use electrospray ion beam depositio ...

2010

Template-free self-assembly of hierarchical ZnO structures from nanoscale building blocks

Klaus Kern, Kannan Balasubramanian, Vivek Pachauri

We study chemical bath deposition method for synthesizing large variety constructions of ZnO nanostructures. By varying reaction kinetics we control the shape, size and morphology to yield flower-like, rolling-pin-like, viscous-fingers-like and antenna-lik ...

Elsevier2010

Site-Specific Self-Assembled Liquid-Gated ZnO Nanowire Transistors for Sensing Applications

Klaus Kern, Kannan Balasubramanian, Vivek Pachauri

A scalable bottom-up solution-based approach for the site-specific realization of ZnO nanowire (ZnO-NW)-based field-effect transistors for sensing applications in liquids is reported. The nanowires are grown across pre-defined electrodes patterned by photo ...

2010

Fluoroalkylphosphonic acid self-assembled monolayer gate dielectrics for threshold-voltage control in low-voltage organic thin-film transistors

Klaus Kern, Frederik Sebastian Ante, Hagen Klauk

An important prerequisite for the design of digital integrated circuits is the ability to control the threshold voltage of the individual transistors during manufacturing. To address the problem of controlling the threshold voltage of low-voltage organic t ...

Royal Society of Chemistry2010

Mixed Self-Assembled Monolayer Gate Dielectrics for Continuous Threshold Voltage Control in Organic Transistors and Circuits

Klaus Kern, Frederik Sebastian Ante, Hagen Klauk

Mixed alkyl/fluoroalkyl phosphonic acid self-assembled monolayers have been prepared as ultra-thin dielectrics in low-voltage organic thin-film transistors and complementary circuits. Mixed monolayers enable continuous threshold-voltage tuning simply by ad ...

Wiley2010

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