Test Structures for Characterising the Silver Chlorination Process During Integrated Ag/AgCl Reference Electrode Fabrication

Robust and repeatable processes are required to fabricate reference electrodes for micro-scale integrated electrochemical sensors. One method for this is to produce a “silver/silver chloride” (Ag/Agel) electrode through chemical chlorination of a thin film silver layer. This paper presents test structures, which can electrically characterise the process to aid process development and in-line control of the chlorination process.