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Revealing Mechanisms of an Eco-Friendly GaN Electrochemical Mechanical Removal Process Modified with Green Fenton Reaction

  • 0School of Mechanical and Electrical Engineering, Soochow University, Suzhou 215021, China.
Langmuir : the Acs Journal of Surfaces and Colloids +

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February 4, 2025

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February 4, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Sodium tripolyphosphate (STPP) enhances Gallium Nitride (GaN) electrochemical mechanical polishing (ECMP) by stabilizing hydroxyl radicals. This novel approach achieves efficient material removal and superior surface quality, offering an eco-friendly polishing solution.

Area Of Science

  • Materials Science
  • Chemical Engineering
  • Surface Science

Background

  • Gallium Nitride (GaN) is a critical semiconductor material with broad applications.
  • Processing GaN is challenging due to its hardness and inertness, hindering polishing efficiency.
  • Electrochemical mechanical polishing (ECMP) of GaN is limited by hydroxyl radical instability.

Purpose Of The Study

  • To develop a novel electrolyte additive for enhanced GaN ECMP.
  • To investigate the effect of sodium tripolyphosphate (STPP) on the green Fenton reaction in GaN ECMP.
  • To evaluate the material removal rate (MRR) and surface roughness (Ra) of GaN wafers.

Main Methods

  • Electrochemical mechanical polishing (ECMP) with STPP additive under a green Fenton reaction.
  • Atomic Force Microscopy (AFM) for surface morphology analysis.
  • Energy-Dispersive Spectrometry (EDS) and X-ray Photoelectron Spectroscopy (XPS) for oxide layer characterization.
  • Nanoscratch tests to determine material removal mechanisms.

Main Results

  • Achieved efficient GaN-ECMP with MRR > 800 nm/h and excellent surface quality (Ra < 0.33 nm).
  • STPP additive prevented iron precipitate formation, extending hydroxyl radical lifetime.
  • Demonstrated synergistic effect of STPP and Fe2+ in GaN material removal.

Conclusions

  • STPP is an effective electrolyte additive for GaN ECMP, improving efficiency and surface finish.
  • The proposed method overcomes limitations of hydroxyl radical instability in Fenton-based ECMP.
  • This research offers a promising eco-friendly polishing slurry for GaN wafer processing.