Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 9: Poster I
HL 9.55: Poster
Montag, 27. März 2006, 15:15–17:45, P3
In-situ characterization of the electronic properties of Si-nanoparticles — •Ingo Plümel1,2, Hartmut Wiggers2, and Axel Lorke1 — 1Experimental Physics, University of Duisburg-Essen, Lotharstraße 1, 47048 — 2Institute of Combustion and Gas Dynamics, University of Duisburg-Essen, Lotharstraße 1, 47048
The compaction behavior of nano- and microcrystalline silicon powder under the application of an uniaxial force was characterized in the 37 MPa to 750 MPa range using DC measurements and impedance spectroscopy.
Changes in conductance and impedance are caused by pressure dependent rearrangement of particles within the powder, and deformation of the particle and electrode interfaces. Time dependent measurements at a constant force show three regions which are dominated by different effects. Analysis of this behavior with impedance spectroscopy enables a more precise characterization of the ongoing relaxation processes. With the help of a laser interferometer, the influence of mechanical changes during compaction on the impedance can be taken into account. The different contributions to the total impedance can be separated by designing and applying an equivalent circuit diagram.
Finally, by analyzing the time dependent change of the separated capacity contributions, the powder can be characterized using an effective medium model.