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A Method for Die Thickness Reduction to sub-35 μm

Published online by Cambridge University Press:  01 February 2011

Jeffrey Thompson ,
Gary Tepolt ,
Livia Racz ,
Chris Rogers ,
Vincent Manno  and
Robert White
Jeffrey Thompson
Affiliation:
[email protected], C.S Draper Laboratory, Microsystems Integration, Cambridge, Massachusetts, United States
Gary Tepolt
Affiliation:
[email protected], C.S Draper Laboratory, Microsystems Integration, Cambridge, Massachusetts, United States
Livia Racz
Affiliation:
[email protected], C.S Draper Laboratory, Microsystems Integration, Cambridge, Massachusetts, United States
Chris Rogers
Affiliation:
[email protected], Tufts University, Mechanical Engineering, Medford, Massachusetts, United States
Vincent Manno
Affiliation:
[email protected], Tufts Universtiy, Mechanical Engineering, Meford, Massachusetts, United States
Robert White
Affiliation:
[email protected], Tufts University, Mechanical Engineering, Medford, Massachusetts, United States
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Abstract

Significant system performance improvements can be realized by stacking die layers. This approach, known as 3-D integration, can reduce RC delay as well as the system form factor. Die are typically thinned in wafer form prior to integration into the modules allowing even greater functional density. However, certain applications require the thinning of individual die. A detailed technique including die lamination, lapping, chemical mechanical planarization (CMP), and release has been developed to thin die to 35 μm thickness. During lamination, the die are temporarily adhered with their active side down to a glass substrate using an adhesive. Mechanical lapping is performed to remove the majority of silicon from the back side. The final thickness of approximately 35 μm is achieved using CMP. The CMP step is critical for the removal of sub-surface damage and prevention of device failure. After thinning, the adhesive is dissolved and the die are handled using porous end effectors. The process can effectively produce die thinned to 35 μm with ± 1.5 μm total thickness variation (TTV).

Keywords

SiCMPslurry
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1112: Symposium E – Materials and Technologies for 3-D Integration , 2008 , 1112-E03-07
Copyright
Copyright © Materials Research Society 2009

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References

REFERENCES

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