TEM Sample Preparation Methods for MEMS Floating Structure Analysis

The MEMS structure has its particular character like hollow areas inside, and “floating” structures. Traditional TEM sample preparation method usually leads to distortion and dissociation defects of the floating structure. This paper introduces two innovative practical methods of TEM sample preparation using focused ion beam (FIB) for MEMS floating structure analysis. Method 1 used glass needle to lift out the separated film onto glue coated blank wafer; method 2 used in situ pick up system to lift out L- or C-shaped cut film onto TEM half-grid. And then the sample can be applied to normal TEM membrane preparation procedure.