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Our research focus is on carbon nanotubes and graphene, which we integrate into device structures to explore their potential for high-speed electronics, optoelectronics, and sensing, and to perform fundamental science experiments. Here are some of the highlights of our research. You can find a lot more on our publications page.

Research Highlights

Low-Temperature Electroluminescence of Excitons and Trions in Monochiral Carbon Nanotube Devices

Low-temperature Electroluminescence spectroscopy of ultra-short-channel devices made from (9,8) carbon nanotubes emitting in the telecom band were repoted with line widths down to 2 meV at 4 K.

ACS Nano (2020) DOI:10.1021/acsnano.9b07207
Towards on-chip communication with carbon nanotubes
Towards on-chip communication with carbon nanotubes

Electrically driven nanotubes can be forced to emit light with a specific color by integration into photonic crystal waveguide.

Nature Photonics (2016) DOI:10.1038/nphoton.2016.70
Carbon nanotubes for high-density short-channel transistors

Best performing short-channel transistors have been built by using highly enriched semiconducting single-wall CNs prepared by combining polymer-wrapping with size-exclusion chromatography.

ACS Nano 10(2) (2016) 1888
Photocurrent Spectroscopy of Solution Processed SWCNTs
Photocurrent Spectroscopy of Solution Processed SWCNTs

We demonstrate the use of variable-wavelength photocurrent microscopy and photocurrent spectroscopy to study the photoresponse of (n, m) sorted SWNT devices.

ACS Nano (2014) DOI:10.1021/nn503278d
Waveguide Integrated Light Emitting Carbon Nanotubes
Waveguide-coupled light sources

Light from an electrically driven carbon nanotube has been coupled directly into a photonic waveguide structure.

Advanced Materials 26 (2014) 3465
Direct patterning of graphene
Maskless lithography of graphene

Electron-beam-induced oxidation is used to write arbitrary patterns into graphene.

Carbon 64 (2013) 84-91
Nanoparticle etching a tunnel into graphite
Nanoparticles digging the world's smallest tunnels

Nickel nanoparticles are used to etch world's smallest tunnels into graphite.

[Nanowerk] [F.A.Z.]

Nature Communications 4 (2012) 1379
Alcohol helps to sort CNTs
Alcohol helps to sort CNTs

Near monochiral s-SWCNT fractions are prepared with a simple, high-throughput procedure based on the introduction of 1-dodecanol to a chromatography column.

ACS Nano 7 (2013) 3557-3564
The role of CNTs in CNT-Si Solar Cells
The role of Nanotubes in CNT-Si Solar Cells

We discuss the role of CNTs in typical CNT-Si solar cell designs.

Advanced Energy Materials (2013)
153Ghz CNT FET

We demonstrate a record-breaking 153 GHz carbon nanotube transistor.

Appl. Phys. Lett. 101 (2012) 053123
Graphene inside an optical cavity
Graphene in a cavity

A sheet of graphene inside an optical cavity shows spectrally confined thermal emission.

[KIT press] [Physik in unserer Zeit]

Nature Communications 3 (2012) 906
CNT-Molecule-CNT junction
Molecular flashlight

We observe electroluminescence from a single nanotube-molecule-nanotube junction.

[F.A.Z.] [Nanowerk] [KIT Video]


Nature Nanotechnology 5 (2010) 863
Array of 100 carbon nanotube devices
CMOS-compatible assembly of nanotube devices

High-density arrays of semiconducting carbon nanotube devices are fabricated in a CMOS-compatible process.


Advanced Materials 23 (2011) 1734
Separation of metallic and semiconducting CNTs by AC fields
Separation of Metallic from Semiconducting Single-Walled Carbon Nanotubes

Using AC-dielectrophoresis a separation of metallic and semiconducting nanotubes was achieved.

Science 18 (2003) 344-347
Voltage-Contrast SEM
Voltage-Contrast imaging of carbon nanotubes

The electronic structure of carbon nanotubes is revealed in-situ in a scanning electron microscope using voltage-contrast imaging.

Nano Research 1 (2008) 321-332