Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster Ib

HL 36.13: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Application of metal nanoparticle monolayers as highly tunable room temperature field-effect transistors — •Hauke Lehmann, Svenja Willing, Mirjam Volkmann, and Christian Klinke — Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany

To tackle the need for electrical devices with reduced power-consumption, a limited charge-carrier concentration is advantageous. Single-electron transistors use the Coulomb repulsion that hinders the addition of electrons onto a small island. Due to this Coulomb-blockade effect, the energy levels inside such a small island are quantized. They can be tuned with an electric field which influences the possible transport across the structure. The resulting current oscillations allow for the definition of a conducting and non-conducting state and, thus, the application as transistor with unique periodic transfer characteristics. Colloidally synthesized CoPt nanoparticles are deposited onto substrates with predefined gold electrodes as highly ordered monolayers via the scalable Langmuir-Blodgett method. The nanoparticle array is limited to stripes by means of a resist mask. To influence the transport, a local back-gate electrode is employed underneath the channel for the first time. This enables good electrostatic control over individually addressable devices without interferences from a dielectric capping layer. This new fabrication method yields smoother and more sinusoidally shaped Coulomb oscillations. The predictable and highly reproducible behavior makes systematic investigations, high on/off-ratios and room-temperature operation possible.