Publications de Eduardo Jian Hua Lee

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

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

Spatially Resolved Potential Distribution in Carbon Nanotube Cross-Junction Devices

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Eduardo Jian Hua Lee

Crossed-nanotube junctions, the basic constituents of carbon nanotube networks, are investigated by scanning photocurrent microscopy. The location of the predominant electrostatic potential drop, at the electrical contacts or at the junction, is found to b ...

Wiley2009

Noninvasive metal contacts in chemically derived graphene devices

Klaus Kern, Marko Burghard, Eduardo Jian Hua Lee, Ravi Shankar Sundaram

We study the properties of gold contacts on chemically derived graphene devices by scanning photocurrent microscopy and gate-dependent electrical transport measurements. In the as-fabricated devices, negligible potential barriers are found at the gold/grap ...

AIP American Institute of Physics2009

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

Contact and edge effects in graphene devices

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Ralf Thomas Weitz, Eduardo Jian Hua Lee

Electrical transport studies on graphene have been focused mainly on the linear dispersion region around the Fermi level(1,2) and, in particular, on the effects associated with the quasiparticles in graphene behaving as relativistic particles known as Dira ...

2008

Carbon nanotube transistors - chemical functionalization and device characterization

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Ralf Thomas Weitz, Eduardo Jian Hua Lee

This review presents an overview of the recent progress made in the field of carbon nanotube (CNT)-based field-effect transistors (FETs). Starting from the simplest device architectures, various methods reported for fabricating CNT-FETs are presented. The ...

Wiley2008

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

Electronic-band-structure mapping of nanotube transistors by scanning photocurrent microscopy

Klaus Kern, Kannan Balasubramanian, Marko Burghard, Eduardo Jian Hua Lee

2007