Global TCAD Solutions

Cutting-Edge TCAD
10.04.2018

V-NAND application example: Channel trans-conductance

Modeling and simulation of V-NAND poly-silicon channel trans-conductance, including variability


Mobility reduction at grain boundaries in V-NAND device

V-NAND Transconductance Variability

 

Typical ensemble of IdVg curvesTypical histogram of threshold voltagesTypical histogram of on-currents

Starting with release 2018.03, GTS Framework can calculate the transconductance statistics of V-NAND flash devices. Macaroni structures show a strong variability in their transconductance behavior, which is due to the formation of grains in the silicon channel during the production process.

GTS Framework allows to study the effects of:

  • Average poly-grain size
  • Bias conditions and device temperature
  • Mobility reduction at grain boundaries

Furthermore, you can study the following variability sources:

  • Random structure of grains and grain boundaries
  • Discrete traps & discrete charging
  • Random crystal orientations of the grains in the channel
  • Random position and energy of traps along the grain boundaries
  • Random position of traps in the grains

For more, have a look at our respective application example, which will be online soon.

The images above show a typical ensemble of IDVG curves (left) and typical histograms of threshold voltages Vth (center) and on currents ION (right), respectively.