Implementation of electrochemical impedance spectroscopy (EIS) for validation of humidity robustness of PCBA design elements

The target of this PhD project is to understand the fundamental aspects of thin water film formation on PCBA by investigating the effect of various material, chemical, and design parameters, while the progressive water film buildup is electrochemically characterized for its electrical properties. The electrical properties of interest are the dielectric and resistive behavior as the water film build-up. The electrical properties of the water film result from the electrochemical process at the connecting bias points on the PCBA, while the water film thickness and ionic strength determine the transition from capacitive to resistive mode causing electrical failures.

This PhD project is funded by Robert Bosch GmbH.