Numerical investigation of plasma effects in silicon MOSFETs for THz-wave detection

C. Jungemann, T. Linn, K. Bittner, H. G. Brachtendorf

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Conventional silicon MOSFETs are used for THz detectors in order to facilitate fabrication of cost-efficient circuits with high integration density. Resistive mixers based on NMOSFETs are investigated by drift-diffusion simulations, which include the time derivative of the current densities usually neglected in TCAD codes. Different time-integration schemes are investigated for transient simulations and the modified backward differentiation formula is found to be the most CPU-efficient method for the periodic steady-state. By comparison with the Boltzmann transport equation it is shown that the drift-diffusion model can capture the salient aspects of transport in the THz range. The features of the device simulator are demonstrated by investigation of the current and voltage responsivity together with the noise-equivalent-power for a resistive mixer based on a quarter-micron NMOSFET.

Original languageEnglish
Pages (from-to)129-134
Number of pages6
JournalSolid-State Electronics
Publication statusPublished - 1 Feb 2017


  • Drift-diffusion model
  • Plasma waves
  • Resistive mixer
  • THz detectors


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