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Acoustic imaging of bump defects in flip-chip devices using split spectrum analysis

 
: Tismer, S.; Brand, S.; Klengel, S.; Petzold, M.; Czurratis, P.

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Institute of Electrical and Electronics Engineers -IEEE-; IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society:
IEEE International Ultrasonics Symposium, IUS 2013. Vol.2 : Prague, Czech Republic, 21 - 25 July 2013
Piscataway, NJ: IEEE, 2013
ISBN: 978-1-4673-5685-5
ISBN: 978-1-4673-5686-2
ISBN: 978-1-4673-5684-8
S.950-953
International Ultrasonics Symposium (IUS) <2013, Prague>
Englisch
Konferenzbeitrag
Fraunhofer IWM ( IMWS) ()

Abstract
In this paper the performance of multi-narrow-band spectral analysis was evaluated concerning defect detection in microelectronic components with flip-chip contacts. Today, flip-chip technology is widely applied for interconnecting silicon dies to a substrate within high-end semiconductor packaging technologies. The integrity of the bump solder interconnection is of major concern for the reliability in this technology. Non-destructive defect localization and analysis of the flip-chip interconnections operating in a semi-automated mode is strongly desired. Scanning acoustic microscopy (SAM) combined with subsequent signal analysis has high potential for non-destructive localization of defective flip-chip interconnects. Analyzing multiple narrow spectral bands of signals acquired by a scanning acoustic microscope enabled the identification and localization of defective flip-chip interconnects. In the current study a 180 MHz transducer with 8 mm focal length was employed f or acoustic data acquisition by SAM. Those data were then analyzed off-line by discrete Fourier transformation, chirp z-transform and cosine transform using custom made MATLAB software. Through multi-narrow band spectral analysis, defective flip-chip interconnects that have not been revealed by standard acoustical imaging methods have been detected successfully. Acoustically found defects have been confirmed by subsequent FIB-cross sectioning and SEM imaging. The high resolution SEM imaging revealed complete and partial delamination at the interface between the die and the bump.

: http://publica.fraunhofer.de/dokumente/N-300959.html