Advanced characterization of glass frit bonded micro-chevron-test samples based on scanning acoustic microscopy

Glass frit bonding is a widely used encapsulation technology for micro-electro mechanical systems. In order to guarantee functionality and reliability of a bonding seal, qualified test methods are required for evaluating the quality and strength of the bonding interfaces which are considered key parameters. In the presented work adapting the micro-chevron-test for glass frit bonded samples and arising challenges are discussed. Motivated by the industrial application of glass frit bonding generally used for frame structures an application related guideline for the application of micro-chevron-testing is presented. In addition, high resolution acoustic inspection is used as a key technology for estimating the effective bond strength in combination with further experimental testing and is likewise used for sample pre-selection and defect localization. The presented content provides a sequential overview beginning with sample preparation of glass frit bonded micro chevron samples to mechanical testing and the result analysis as well as a statistical interpretation of a bonded silicon test wafer.