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cleaning [2013/11/17 06:53] mcmastercleaning [2013/11/17 07:18] (current) mcmaster
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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 ===== ===== Polymide passivation =====
  
-Can be removed with strong acids (eg RFNA).  Stilldoes not come off easily so other methods should be researched. +General reccomendations: 
- +  * Oxygen plasma is probably best if you have access to it 
- +  * If you can deal with safety issuesethylendiamine may be next best 
- +  * Fuming nitric aicd works but takes while.  This can potentially cause chip damage but shouldn't hurt Cu/Al if you keep the concentration high 
-"find 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]])+  * 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
 
cleaning.txt · Last modified: 2013/11/17 07:18 by mcmaster
 
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