Improving the measurement sensitivity of interdigital dielectric capacitors (IDC) by optimizing the dielectric property of the homogeneous passivation layer

Christian Jungreuthmayer, Gerald Birnbaumer, Peter Ertl, Jürgen Zanghellini

Research output: Contribution to journalArticlepeer-review

Abstract

Interdigitated dielectric capacitors (IDC) are a key component in numerous technologies, such as labonachip (LOC) devices. A critical aspect of designing IDC is the choice of the optimal passivation layer, as it affects the IDC´s sensitivity. In this work we present a quick and simple method (a) to optimize the sensitivity of dielectric sensors with homogeneous passivation layers and (b) to determine the frequencydependent permittivity of materials. Consequently, optimizing the permittivity of the passivation layer and improving the measurement sensitivity of the dielectric sensor is significantly simplified, as it removes the need to perform a series of tedious experiments or computationally expensive simulations.
Original languageEnglish
Pages (from-to)418-424
Number of pages7
JournalSensors and Actuators B-Chemical
Volume162
Publication statusPublished - 2012

Research Field

  • Outside the AIT Research Fields

Keywords

  • Interdigiated dielectric capacitors
  • IDC
  • Sensitivity
  • Passivation layer
  • Permittivity
  • Optimization
  • Capacitance

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