Fabrication and electrical characterization of a pore–cavity–pore device

We present a solid state nanopore device structure comprising two nanopores which are stacked above each other and connected via a pyramidal cavity of 10 fl volume. The process of fabrication of the pore-cavity-pore device (PCP) relies on the formation of one pore in a Si(3)N(4) membrane by electron...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2010-11, Vol.22 (45), p.454115-454115
Main Authors: Pedone, D, Langecker, M, Münzer, A M, Wei, R, Nagel, R D, Rant, U
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Electric Conductivity
Equipment Design
Equipment Failure Analysis
Exact sciences and technology
General and physical chemistry
Materials Testing
Membranes
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotechnology - instrumentation
Porosity
Porous materials
Surface Properties
Ultrafiltration - instrumentation
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Summary:We present a solid state nanopore device structure comprising two nanopores which are stacked above each other and connected via a pyramidal cavity of 10 fl volume. The process of fabrication of the pore-cavity-pore device (PCP) relies on the formation of one pore in a Si(3)N(4) membrane by electron beam lithography, while the other pore is chemically etched into the Si carrier by a feedback controlled process. The dimensions of the two nanopores as well as the cavity can be adjusted independently, which is confirmed by transmission electron microscopy. The PCP device is characterized with respect to its electrical properties, including noise analysis and impedance spectroscopy. An equivalent circuit model is identified and resistance, capacitance, and dielectric loss factors are obtained. Potential and electric field distributions inside the electrically biased device are simulated by finite element methods. The low noise characteristics of the PCP device (comparable to a single solid state nanopore) make it suitable for the stochastic sensing of single molecules; moreover, the pore-cavity-pore architecture allows for novel kinds of experiments including the trapping of single nano-objects and single molecule time-of-flight measurements.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/22/45/454115