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cleaning [2013/11/17 06:48] – mcmastercleaning [2024/06/15 15:24] (current) – polymide -> polyimide (typo) philpem
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 Shame on you if you picked up a die with your bare hands but things do happen.  Acetone does not clean off fingerprints very well but soapy water does.  The above picture was taken after putting a fingerprint on a slide and sonicating in acetone for a few minutes.  It has little to no effect.  Fingerprint oils do not respond to polarized light (ie will black out). Shame on you if you picked up a die with your bare hands but things do happen.  Acetone does not clean off fingerprints very well but soapy water does.  The above picture was taken after putting a fingerprint on a slide and sonicating in acetone for a few minutes.  It has little to no effect.  Fingerprint oils do not respond to polarized light (ie will black out).
  
-===== Polymide passivation ===== 
  
-Can be removed with strong acids (eg RFNA).  Still, does not come off easily so other methods should be researched.+===== Polyimide passivation =====
  
- +General reccomendations: 
- +  * Oxygen plasma is probably best if you have access to it 
-"find a polyimide layer that was not entirely removed by HNO3 but which can be dissolved with ethylendiamine" ([[http://static.usenix.org/publications/library/proceedings/smartcard99/full_papers/kommerling/kommerling_html/|ref]])+  * If you can deal with safety issues, ethylendiamine may be next best 
 +  * Fuming nitric aicd works but takes a while.  This can potentially cause chip damage but shouldn't hurt Cu/Al if you keep the concentration high 
 +  * Piranha eats it quickly but it eats other metals nearly as quickly so its probably best avoided
  
   
 ==== Ethylendiamine ==== ==== Ethylendiamine ====
  
-From [Beck 23]+"find a polyimide layer that was not entirely removed by HNO3 but which can be dissolved with ethylendiamine" ([[http://static.usenix.org/publications/library/proceedings/smartcard99/full_papers/kommerling/kommerling_html/|ref]]) 
 + 
 +Rest from [Beck 23]
  
 Procedure: Procedure:
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 ==== Ethylendiamine + hydrazine monohydrate ==== ==== Ethylendiamine + hydrazine monohydrate ====
 +
 +"Ethylenediamine readily reacts with moisture in humid air to produce a corrosive, toxic and irritating mist, to which even short exposures can cause serious damage to health (see safety)." [Wikipedia]
  
 From [Beck 23].  Use this if plain ethylendiamine does not work.  Unclear if it has a higher corrosion potential, but heed the safety warning From [Beck 23].  Use this if plain ethylendiamine does not work.  Unclear if it has a higher corrosion potential, but heed the safety warning
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     * 1 mL 30% H2O2     * 1 mL 30% H2O2
   * Cook at 80° C   * Cook at 80° C
 +
 +Notes:
 +  * Seems like this is same thing as [[Piranha solution]]?  In any case see notes there
 +
 +
  
 ==== Fuming nitric acid (FNA) ==== ==== Fuming nitric acid (FNA) ====
cleaning.1384670926.txt.gz · Last modified: 2013/11/17 06:48 by mcmaster