SiC Vertical MOSFET channel length modulation

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SUMMARY

The discussion focuses on the representation of channel length modulation in SiC vertical MOSFETs, particularly how increased drain voltage affects the pinch-off phenomenon. Unlike lateral MOSFETs, vertical MOSFETs have their drain positioned away from the channel creation point, leading to unique electrical characteristics. The vertical configuration allows for efficient current flow from the source to the drain, enhancing voltage withstand capabilities. This design is crucial for applications in SiC power MOSFETs.

PREREQUISITES
  • Understanding of MOSFET structures, specifically vertical and lateral configurations
  • Knowledge of SiC (Silicon Carbide) materials and their applications in power electronics
  • Familiarity with electrical characteristics related to channel length modulation
  • Basic principles of semiconductor physics
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  • Research the operational principles of SiC power MOSFETs
  • Study the effects of drain voltage on channel length modulation in vertical MOSFETs
  • Explore design considerations for vertical versus lateral MOSFETs
  • Learn about the applications of vertical MOSFETs in high-voltage power systems
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Electrical engineers, power electronics specialists, and researchers interested in advanced MOSFET technologies and their applications in high-voltage systems.

bonkgeek
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Hello , Thank you readind me
I wonder how to represent the reduction in channel length(pinch off seen in lateral MOSFET) for vertical mosfets due to the increase in drain voltage because the drain is at the back, away from the creation of the channel position.
 

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Welcome to PF.

Your diagrams only seem to show lateral MOSFETs. Can you show a typical vertical MOSFET geometry and say where it is used? I have not used them yet.
 
Thanks
I am presenting a vertical MOSFET, where the drain is situated in a different plane compared to the source and gate. In this configuration, the current flows vertically from the source to the drain.
This design contrasts with the lateral MOSFET, which you can learn more about by referring to examples available HERE https://www.mks.com/n/mosfet-physics.
Vertical MOSFETs are predominantly used in SiC power MOSFETs, as their vertical structure enables the component to exhibit strong voltage withstand capability.
 

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  • LATERAL MOSFET.PNG
    LATERAL MOSFET.PNG
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  • lateral vs vertical.PNG
    lateral vs vertical.PNG
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