I set up diffusion experiments using the wafers that Tom was able to pass gold through in DI H2O using pressure. 5nm particles do not pass in 24 or 48 hours. If we have extra samples I will be testing 5nm particles in 10mM KCl.
Recently I tested track etched membranes and crystalline silicon (basically the backside of the membrane chips) following the sample buffer adsorption assay. This new data comprises the last two bars on the following chart. I’m surprised to see that crystalline silicon is so low in comparison to pnc-Si. This is something I’d like to test…
I repeated a previous experiment but this time I used samples (no RTP) from W685 in oven @ 37C in DMEM(-FBS). Four type of samples (blank chip with no slits, chip with both intact membranes, chip with one intact membrane and chip with both broken membranes) were used at different time points. Again the expected…
The objective of last week’s production was to track down the source of Cu contamination. The good news is that none of the wafers showed signs of Cu. The bad news is we are not sure why it has disappeared all of the sudden. Chris and I observed that there are particles in the well…
Last week I reported wafer 403 showed uniformity across all positions but had a huge amount of pinholes. Wafer 404 (TEOS process & thermal oxide base) was initially annealed at 1000 C and then annealed again at 1000 C for 5 minutes in the RTP. The second anneal helped with the sputtered oxide film quality…
Last week, I did another two wafers with different top oxide thicknesses to verify my hypothesis about the top oxide thickness effect on pores. The wafers were 20/15/03(bottom/middle/top) and 20/15/40. According to the hypothesis, the porosity of 20/15/03 would continue decreasing, where for the 20/15/40 structure, the porosity might drop. Same tip I used before,…
Here are the conversion ratios for the URMC TEM images (so we’re all using the same standard): 30kx – 0.39 px/nm50kx – 0.67 px/nm150kx – 2.2 px/nm300kx – 4.5 px/nm These numbers should be used for wafers 187, 189, and > 310. Unlike the RC TEM conversions, these numbers seem to be consistent between the…