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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Copper selenide (Cu2Se) is a promising material for microelectronic applications.
  • Controlled synthesis of high-quality Cu2Se films is essential for device performance.

Purpose of the Study:

  • To develop a scalable method for synthesizing thick Cu2Se films.
  • To investigate the effect of pH and electrochemical potential on Cu2Se film properties.

Main Methods:

  • Potentiostatic electrochemical deposition in acidic aqueous solutions.
  • Characterization using scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffraction (XRD).

Main Results:

  • Achieved deposition of up to 12.5 μm-thick Cu2Se films with low surface roughness (130 nm) at pH < 1.5.
  • Identified optimal potential window for Cu2Se formation (-0.37 V to -1.3 V).
  • Demonstrated that higher pH (>1.5) leads to increased roughness and reduced current efficiency.

Conclusions:

  • Potentiostatic synthesis in acidic media offers a controlled and scalable route to high-quality Cu2Se films.
  • Film morphology and quality are highly dependent on solution pH and applied potential.
  • Optimized synthesis conditions enable fabrication of advanced microdevices.