Failure of Static Random-Access Memory (SRAM)
- Practical Electron Microscopy and Database -
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For SRAM (static random-access memory) chips, a part or the entire chip will not be operable even if just one out of millions of transistors cannot work correctly.

Figure 2310 shows a failure of S-RAM cell induced by uncontrolled diffusion of Ni under a spacer. Note that the failing S-RAM cell was first localized on a wafer by the voltage-contrast method using scanning electron microscopy (SEM).

TEM bright field image of a Ni encroachment (as indicated by the arrow) in an S-RAM cell

Figure 2310. TEM bright field image of a Ni encroachment (as indicated by the arrow) in an S-RAM cell. [1]

 

 

 

 

[1] S. Pokrant, R. Pantel, M. Cheynet, Physical characterization by valence electron energy loss spectroscopy, 83 (11–12) 2364–2367 (2006).

 

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