Publications de Adarsh Singh Sagar

Spatially resolved photocurrents in graphene nanoribbon devices

Klaus Kern, Kannan Balasubramanian, Stephan Rauschenbach, Marko Burghard, Adarsh Singh Sagar, Thomas Dufaux

We present here a scanning photocurrent microscopy study of individual graphene nanoribbons, revealing pronounced photocurrent responses close to the nanoribbon/metal contacts. The magnitude of the corresponding photocurrent signal was found to be directly ...

Amer Inst Physics2013

Electric field effect in graphite crystallites

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Adarsh Singh Sagar

Graphite is a highly anisotropic crystal with a quasi-two-dimensional electronic structure exhibiting high intrinsic charge carrier mobility. Here, we investigate the effect of an electric field on the resistance of individual graphite crystallites with a ...

AIP American Institute of Physics2012

Graphene-based Field-effect Transistors

Adarsh Singh Sagar

With transistors set to reach their smallest possible size in the next decade, the silicon chip is likely to change dramatically, or be replaced entirely. The transistor industry's path which has been largely shaped by Gordon Moore's famous prediction that ...

EPFL2011

Polymer-electrolyte gated graphene transistors for analog and digital phase detection

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Adarsh Singh Sagar

We present an alternating current (ac) circuit based on a misoriented bilayer graphene device for analog and digital phase detection. We exploit the ambipolar nature of the transfer characteristics of a misoriented bilayer graphene transistor. The transist ...

AIP American Institute of Physics2011

Marker-free on-the-fly fabrication of graphene devices based on fluorescence quenching

Klaus Kern, Kannan Balasubramanian, Adarsh Singh Sagar

Graphene has been dominating the electronic research community recently, with a brisk surge in proposals for its use in novel devices. The aspirations of 2D-carbon-based electronics largely rely on the availability of a mass-production technique to obtain ...

2010

Effect of Stacking Order on the Electric-Field Induced Carrier Modulation in Graphene Bilayers

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Eduardo Jian Hua Lee, Adarsh Singh Sagar

When planar graphene sheets are stacked on top of each other, the electronic structure of the system varies with the position of the subsequent sublattice atoms. Here, we employ scanning photocurrent microscopy to study the disparity in the behavior of cha ...

American Chemical Society (ACS)2009

Strong p-Type Doping of Individual Carbon Nanotubes by Prussian Blue Functionalization

Klaus Kern, Marko Burghard, Ralf Thomas Weitz, Eduardo Jian Hua Lee, Adarsh Singh Sagar

2008