Tylan3 is now a silicide furnace!
latta at snf.stanford.edu
Wed Jan 14 16:44:22 PST 2004
Awhile ago I sent out a message asking for comments about changing the
contamination staus of tylan3 and tylan4. That plan is now going into
effect. As of 22:30 tonight when user chcheng has completed his furnace
operation, tylan3 will be considered silicide contaminated, just like
dear departed tylan7.
If you are processing sensitive devices, do not use tylan3 or tylan4.
For review, here is the complete plan;
Over the past several years there have been many requests for oxidation
furnaces that can accommodate non-standard materials or materials that
have not been authorized to go into the clean oxidation tubes. This
message is to address that need and to explain how the new six-inch
Thermco furnaces will be used.
First, tylan1 and tylan2 will remain as they presently are; clean
Tylan3 will become the same as the present tylan7 is; a silicide tube.
The real tylan7 is to become a new six-inch TEOS tube. This conversion
will occur while the present TEOS tube is still functional and will
affect no other furnace in bank 2 (tylan5, tylan6 and tylansige) other
than a two week shutdown, time to be announced.
Tylan4 will become a ‘dirty’ furnace. Materials that are not allowed in
the other furnaces may be allowed in it. Obviously, materials that will
break down or redeposit in the tube will not be allowed. Members who
want to use the furnace will need authorization from the Special
Materials Committee before using it.
Quartzware for tylan3 and 4 will be marked so that there will be no
chance of mixing it with clean quartzware. Additionally, the display
areas of the furnaces will be color coded to help members in recognizing
the contamination level of the tubes.
The new six-inch furnaces, thermco1 and thermco2 will be clean. Thermco1
is going to be a ‘super-clean’ tube to be used for gate oxides only.
Thermco2 will be available for to lab members for clean oxides.
Below is a summary of the changes;
Tylan1- remains the same, a clean oxidation tube
Tylan2- remains the same, a clean oxidation tube
Tylan3- becomes a silicide oxidation tube (like tylan7 is presently)
Tylan4- becomes a ‘dirty’ oxidation tube for approved materials
Tylan7- becomes 6-inch TEOS tube
Thermco1- super-clean gate oxidations, maximum oxide thickness about 3000A
Thermco2- same as tylan1 and 2, a clean oxidation tube
Please let me know if you have any questions,
Stanford Nanofabrication Facility
CIS Bldg, 145
420 Via Palou Mall
Stanford, CA, 94305 - 4070
Fax (650) 725-6278
More information about the tylan3