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delayer:wet

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delayer:wet [2018/01/21 05:47] – [Pitting] mcmasterdelayer:wet [2025/09/02 20:32] (current) – [Determining sample thickness] Add archive.org link for dead SiO2 colour chart philpem
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 Many solutions give distance per minute.  Other than carefully observing when done, its useful to get some estimates to as how long etching takes.  A couple of techniques: Many solutions give distance per minute.  Other than carefully observing when done, its useful to get some estimates to as how long etching takes.  A couple of techniques:
   * Focus on different layers and measure how much focus knobs had to be turned   * Focus on different layers and measure how much focus knobs had to be turned
-  * Use thin film interference colors: http://www.idea2ic.com/LM13600/SiO2_Color_Chart.pd+  * Use thin film interference colors: https://web.archive.org/web/20170324225827/http://www.idea2ic.com/LM13600/SiO2_Color_Chart.pdf
  
  
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   * 1 mL 40% HF   * 1 mL 40% HF
   * 20-25 @ room temp   * 20-25 @ room temp
 +
 +Alternate:
 +  * 1 mL Whink
 +  * 10 mL 70% HNO3
  
 Notes: Notes:
-  * I haven't used this solution yet+  * 2023-07-23: did a good job near top metal when the other solution wasn't working 
  
 ====== References ======  ====== References ====== 
delayer/wet.1516513658.txt.gz · Last modified: 2018/01/21 05:47 by mcmaster