[IEEE 2016 IEEE 23rd International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Singapore (2016.7.18-2016.7.21)] 2016 IEEE 23rd International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - A study on device robustness with integrated effects from low parts-per-billion level of metallic elements in wafer cleaning process chemicals