What advantages do tri-gate MOSFETs have over FinFETs?

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Discussion Overview

The discussion revolves around the differences and advantages of tri-gate MOSFETs compared to FinFETs, focusing on their performance characteristics and operational principles. The scope includes technical explanations and comparisons of device structures.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • Some participants suggest that tri-gate MOSFETs and FinFETs are essentially the same, differing mainly in terminology.
  • Others argue that tri-gate MOSFETs perform better due to superior subthreshold behavior and enhanced gate control over the channel.
  • One participant notes that tri-gate devices have a larger surface area for gate contact, which may improve capacitance and control.
  • A participant mentions that FinFET can refer to both double-gated and tri-gated devices, indicating a potential for confusion in terminology.
  • References to academic sources, such as materials from Prof. C.M Hu, are suggested for further exploration of tri-gate MOSFETs.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether tri-gate MOSFETs and FinFETs are fundamentally the same or different, and the advantages of tri-gate devices remain contested.

Contextual Notes

There are unresolved questions regarding the definitions and distinctions between FinFET and tri-gate MOSFETs, as well as the implications of their structural differences on performance.

ohopu
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What is the difference between multi-fin trigate MOSFET and multi-fin FinFET? Why Trigate performs better?
 
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They are generally the same thing. Just different names as trade names.
 
They are the same but people call different names. They call it FinFET because the shape of the device looks like a fin of a fish. I recalled that Prof. C.M Hu from Berkeley prefer tri-gate. (I don't remember clearly). The performance is better because it has a better subtreshold behavior. The gate has more control on the channel. If you are interested, you may go to Prof. C.M Hu to take a look. There should be some materials about trigate MOSFET.
 
FinFET can sometimes refer to a double-gated (side-gated) OR a tri-gated (top and side gated) device. Tri-gated is, as the name says, tri-gated. Tri-gated devices are superior because they have a larger surface area over which the gate contacts. Remember that the gate stack/semiconductor is essentially an M/I/S capacitor. To increase the capacitance, which increases the gate's control over the channel, you want to increase the area over which the capacitor covers.

I suggest this review article: http://www.nature.com/nature/journal/v479/n7373/full/nature10676.html
 
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