Comparison of Monte Carlo and NEGF simulations of double gate MOSFETs

R. Ravishankar, G. Kathawala, U. Ravaioli, S. Hasan, M. Lundstrom

Research output: Contribution to journalArticlepeer-review


The present work compares the simulation results of the two-dimensional full band Monte Carlo simulator (MOCA) developed at the University of Illinois at Urbana-Champaign and the two-dimensional quantum simulator (NanoMOS) developed at Purdue University. Double-gate MOSFETs of three body thicknesses - tSi = 4, 3 and 2 nm - Were considered in this study. For a body thickness of 4 nm, the conduction band profiles and sheet charge densities obtained from MOCA and NanoMOS almost overlap, particularly for high gate and drain-to-source biases. However, as the body thickness is reduced, quantum effects are captured more naturally in NanoMOS since MOCA only uses a simple quantum correction scheme, with an otherwise semi-classical model. However, even for thinner devices, since MOCA makes use of a detailed band structure and scattering model, high energy transport is better reproduced by the Monte Carlo procedure. A particle description is appealing for nanoscale simulation, in order to reproduce the granularity aspects of the transport. Comparisons with a quantum model based on continuum flow equations as in NanoMOS should provide valuable insight to better incorporate the quantum mechanical aspects in a practical particle-based model.

Original languageEnglish (US)
Pages (from-to)39-43
Number of pages5
JournalJournal of Computational Electronics
Issue number1-2
StatePublished - Apr 2005


  • Double-gate MOSFET
  • Monte Carlo
  • Quantum effects
  • Velocity overshoot

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Electrical and Electronic Engineering


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