In Situ Real-Time Monitoring of ITO Film under a Chemical Etching Process Using Fourier Transform Electrochemical...

Area of Science:

• Electrochemistry
• Materials Science
• Surface Science

Background:

• Indium tin oxide (ITO) electrodes are vital in electronics.
• Wet etching processes require precise control and monitoring.
• Conventional techniques struggle with real-time analysis of transient electrochemical processes.

Purpose of the Study:

• To introduce a novel in situ, real-time method for investigating ITO electrodes during wet etching.
• To demonstrate the capability of FT-EIS for monitoring dynamic changes in electrode properties.
• To validate the FT-EIS technique against established analytical methods.

Main Methods:

• Implementation of step-excitation Fourier-transform electrochemical impedance spectroscopy (FT-EIS).
• Continuous acquisition of equivalent circuit parameters (Rct, Cdl) during etching.
• Validation using cyclic voltammetry, impedance spectroscopy, FESEM, EDS, XRD, and COMSOL simulation.

Main Results:

• FT-EIS successfully captured electrode activation and etching completion in real-time.
• Equivalent circuit parameters provided continuous insights into the etching process.
• The technique was validated against multiple complementary analytical methods.
• Reproducible fabrication of intact interdigitated array (IDA) electrodes was demonstrated.

Conclusions:

• FT-EIS offers a powerful tool for in situ, real-time examination of transient electrochemical systems.
• This method overcomes limitations of conventional techniques for analyzing dynamic processes like etching.
• The technique holds promise for optimizing fabrication processes and understanding complex electrochemical behaviors.