Energy conversion processes between heat and electricity are at the heart of electricity generation and energy harvesting and of heat dissipation in electronic devices and cooling.

We explore thermoelectric energy conversion in semiconducting nanostructures, pyroelectricity and electro-thermal effects in self-heated nanodevices.


Measurement of Thermoelectric Properties

Measurement of Thermoelectric Properties of Single Semiconductor Nanowires

S. Karg et al.
J. Electron. Mater. 42(7) 2409-2414, 2013.

We evaluated a self-heating method to determine the thermal conductivity of individual silicon and indium arsenide (InAs) nanowires. Furthermore, electrical conductivity and Seebeck coefficient (thermopower) were measured.

Full thermoelectric characterization

Full thermoelectric characterization of InAs nanowires using MEMS heater/sensors

S.F. Karg et al.
Nanotechnology 25(30) 305702, 2014.

Precise measurements of a complete set of thermoelectric parameters on a single indium-arsenide nanowire (NW) have been performed using highly sensitive, micro-fabricated sensing devices based on the heater/sensor principle.

charge carrier concentration

Using the Seebeck coefficient to determine charge carrier concentration, mobility, and relaxation time in InAs nanowires

V. Schmidt et al.
Appl. Phys. Lett. 104, 012113, 2014.

We demonstrated that by careful analysis of resistance and Seebeck coefficient as a function of both temperature and gate-voltage in combination with a modeling of the thermoelectric properties of InAs, one can infer charge carrier concentration, charge carrier mobility, and relaxation time in InAs nanowires.


Electrical and thermoelectrical properties of gated InAs nanowires

P. Mensch et al.
In Proc. Solid-State Device Research Conference (ESSDERC), 2013.

Measurements of electrical conductivity and Seebeck coefficient are reported varying the carrier concentration through application of a gate voltage. The temperature dependence of the electron mobility is examined.

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Bernd Gotsmann

Bernd Gotsmann

IBM Research scientist

Siegfried Karg

Siegfried Karg

IBM Research scientist