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Related Experiment Video

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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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InGaAs FinFETs Directly Integrated on Silicon by Selective Growth in Oxide Cavities.

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Summary

III-V semiconductors like Indium Gallium Arsenide (InGaAs) show promise for advanced transistors. Researchers developed InGaAs FinFETs on silicon using template-assisted selective epitaxy, achieving high performance for future electronics.

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III-VIntegrationMOSFETsTASE

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Area of Science:

  • Semiconductor Physics
  • Materials Science
  • Nanoelectronics

Background:

  • Silicon is reaching its scaling limits for advanced logic and RF applications.
  • III-V semiconductors, particularly InGaAs, offer superior electron mobility for n-type metal-oxide-semiconductor field-effect transistors (MOSFETs).
  • Monolithic integration of III-V materials on silicon is crucial for next-generation integrated circuits.

Purpose of the Study:

  • To demonstrate the monolithic integration of Indium Gallium Arsenide (InGaAs) FinFETs on silicon substrates.
  • To investigate the fabrication of advanced FinFETs using template-assisted selective epitaxy (TASE).
  • To characterize the performance of InGaAs FinFETs with scaled dimensions.

Main Methods:

  • Metal-organic chemical vapor deposition (MOCVD) for epitaxial growth of InGaAs channels within oxide cavities via TASE.
  • Fabrication of FinFETs using a CMOS-compatible replacement-metal-gate process flow.
  • Scanning transmission electron microscopy (STEM) for material quality assessment.
  • Controlled InGaAs digital etching for doped extensions.

Main Results:

  • Successfully integrated InGaAs channels on silicon using TASE with good crystal quality confirmed by STEM.
  • Fabricated FinFETs with gate lengths down to 20nm, featuring self-aligned regrown contacts and narrow spacers.
  • Demonstrated a 90nm gate length, 40nm fin width InGaAs FinFET with an on-current of 100 µA/µm and a subthreshold slope of 85 mV/dec.

Conclusions:

  • Template-assisted selective epitaxy is an effective technique for integrating high-performance InGaAs channels on silicon.
  • The developed InGaAs FinFETs show promising electrical characteristics for low-power logic and RF applications.
  • Further scaling and optimization of InGaAs FinFETs on silicon are feasible for advanced technology nodes.