Specific Process Knowledge/Lithography/Development/beaker developer: Difference between revisions
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Finally the safety of the operator is at a significantly higher risk, since any manual handling of chemicals carries the risk of accidental spills with it. This is especially problematic if the developer is TMAH based, where direct skin exposure of >1% TMAH on a few percent of the body must be treated as a life-threatening event. | Finally the safety of the operator is at a significantly higher risk, since any manual handling of chemicals carries the risk of accidental spills with it. This is especially problematic if the developer is TMAH based, where direct skin exposure of >1% TMAH on a few percent of the body must be treated as a life-threatening event. | ||
=Special rules for manual beaker development of TMAH= | |||
*Automatic agitation methods are not allowed - this includes magnetic stirring or sonication | *Automatic agitation methods are not allowed - this includes magnetic stirring or sonication | ||
*Manual agitation methods, which create large waves or turbulence in the development solution, are not allowed | *Manual agitation methods, which create large waves or turbulence in the development solution, are not allowed | ||
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*Users requiring manual beaker development of TMAH based developers must additionally provide valid reasons for not using the already available automatic and semi-automatic tools | *Users requiring manual beaker development of TMAH based developers must additionally provide valid reasons for not using the already available automatic and semi-automatic tools | ||
=Standard manual beaker development procedure= | |||
[[File:Beaker_development_v1.png|600px|thumb|Standard procedure for manual beaker development in fume hood:<br>1) Submerge exposed substrate into development solution<br>2) When timer ends, move substrate directly into Rinse 1<br>3) After a few seconds, move substrate into Rinse 2*<br>4) Remove developed substrate for drying<br>(*It is allowed to omit the Rinse 2 step)|right]] | [[File:Beaker_development_v1.png|600px|thumb|Standard procedure for manual beaker development in fume hood:<br>1) Submerge exposed substrate into development solution<br>2) When timer ends, move substrate directly into Rinse 1<br>3) After a few seconds, move substrate into Rinse 2*<br>4) Remove developed substrate for drying<br>(*It is allowed to omit the Rinse 2 step)|right]] | ||
The standard procedure for manual beaker development in a fume hood is as follows: | The standard procedure for manual beaker development in a fume hood is as follows: | ||