Fachbereich Physik

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Graphene Field-Effect transistors for Biosensing.

In the last couple of decades, field-effect transistors based on low dimension materials are extensively attracting the attention of scientific society. Initially predicted to replace silicon in modern micro- and nanoelectronics, graphene and carbon nanotubes are considered to be even more promising for ultrasensitive biosensing due to their outstanding electronic properties and surface-to-volume ratio. The proposed master project is focused on learning the basic nanofabrication processes with the following fabrication of graphene-based field-effect transistors (GFETs) for biosensing and electronic transport measurements on them.

(a) Top view on the chip with GFETs fabricated in our group. Here yellow-colored - Ti/Au feedlines with the liquid gate openings in between. (b) A close-up of the device for transmission line method (TLM) measurements. (c) I-V transfer characteristic of one of the GFETs. In the top right corner is a crossectional depiction of the GFET structure and its terminals.