• Neuromorphic Device & Circuit
    Neuromorphic – Parallel hardware network imitating neuron and synapse action
  • PF neuron device
    PF neuron device with integrate-and-fire functionality
  • Si MOSFET-based Sensor Platform
    Si MOSFET type sensor (gas, humidity, barometric)
  • 3D NAND Flash Memory
    New device concept having steep switching characteristics by utilizing positive-feedback
  • Optical Modulator
    Fiber-to-Waveguide Optical Coupler with Reflectors
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Research

Nonvolatile Memory

Characterization of 3D stacked NAND Flash Memory

Fabrication

Modeling

Characterization

Simulation & Design

Trap analysis


Energy band diagram and equivalent capacitance model

AC-Gm method to extract interface trap

Use frequency characteristic of capacitance


Parallel conductance (Gp/ω) and interface trap density (Dit)

Interface trap figure with cell state

Cell state effect in interface trap profile


RTN & Activation Energy
Pulse waveform of VCG
Transient IBL characteristics

Random Telegraph noise(RTN) caused by trap

Methods to measure RTN characteristic


Noise power spectral density & Trap position

Trap position extracting

RTN characteristic as function of frequency