Andreas Lippert

 
Year:

Electronic transport at the hydrogen-terminated diamond/electrolyte interface


Due to an increasing demand for health-care applications, research on bio-sensors based on semiconductors attracts great attention. Unfortunately, most common semiconductors like silicon are not bio-compatible, whereas diamond is a very stable material in contact with an aqueous electrolyte. In order to archive conductivity, the diamond is terminated by hydrogen. While the usual electronic properties of diamond have been studied over the years, the electronic transport at the hydrogen-terminated diamond/electrolyte interface is lacking a complete understanding.

 
Fig. 1. Band scheme of hydrogen-terminated diamond in contact with electrolyte under potential control.
 
Hydrogen-terminated diamond samples in contact with an electrolyte show a p-type surface conductivity, as revealed in Hall effect experiments. This surface conductivity is based on a two-dimensional hole gas formed by the band bending beneath the surface. It can be modulated by an applied potential through the electrolyte, enabling the design of solution gate field effect transistors (SGFETs). We investigate the surface conductivity of hydrogen-terminated diamond using in-liquid Hall effect measurements under potential control. Thus, we are able to independently determine the carrier concentration and the carrier mobility. Additional research focuses on the charge distribution at the diamond/electrolyte interface which is done by self-consistent calculations using the numerical tool nextnano3.

Publications

Hydrophobic Interaction and Charge Accumulation at the Diamond-Electrolyte Interface

Physical Review Letters 106, 196103 (2011)

M. Dankerl | A. Lippert | S. Birner | U. Stützel | M. Stutzmann | J. A. Garrido

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Graphene Solution-Gated Field-Effect Transistor Array for Sensing Applications

Advanced Functional Materials 20, 3117–3124 (2010)

M. Dankerl | M. Hauf | A. Lippert | L. Hess | S. Birner | I. D. Sharp | A. Mahmood | P. Mallet | J. Y. Veuillen | M. Stutzmann | J. A. Garrido

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Electronic transport at the interface between diamond and aqueous electrolyte

DPG Fruehjahrstagung, Dresden, Germany

M. Dankerl | U. Stützel | A. Lippert | M. Stutzmann | J. A. Garrido

TUM Technische Universität München TUM Technische Universität München Physik Department Elektrotechnik und Informationstechnik TUM Technische Universität München
 

Events & News

17 Jan 2018

ERC Consolidator Grant for Gregor Koblmüller   more

10 Aug 2017

Best Poster Awards for Ganpath Veerabathran and Alexander Andrejew at iNOW 2017   more

27 Jun 2017

Best Poster Award at Nanowire Week for Jochen Bissinger   more

15 Mar 2017

Dr. Kai Müller admitted to the “Junges Kolleg” of the Bavarian Academy of Sciences   more

27 Feb 2017

Two-photon pulses from a single two-level system   more

Seminars

January 26, 2018

Reliability of hexagonal boron nitride dielectric stacks for CMOS applications   more

January 23, 2018

Helical states, spin-orbit coupling, and phase-coherent transport in InAs nanowires   more

January 16, 2018

New insights into novel (and conventional) materials using polarization-sensitive infrared magneto-spectroscopy   more