Specific Process Knowledge/Thermal Process/A1 Bor Drive-in furnace: Difference between revisions
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The purpose of the boron doping is to make conductive structures, etch stop layers etc. For the pre-deposition process boron-nitride source wafers are used as the doping source to dope silicon wafers. There are only a few source wafers available, i.e. it is not possible to dope an entire batch of 30 wafers, but both sides of the source wafers are available for doping. It is necessary to activate the source wafers before use by heating them for 1 hour at the temperature needed during the pre-deposition (but never at a temperatures lower than 1050 C). During the pre-deposition a boron phase layer is created on the silicon wafers. This layer can be removed in BHF, if argon is used instead of nitrogen for the pre-deposition (at temperatures higher then 1050 C), otherwise the wafers have to be oxidized before the BHF etch. | The purpose of the boron doping is to make conductive structures, etch stop layers etc. For the pre-deposition process boron-nitride source wafers are used as the doping source to dope silicon wafers. There are only a few source wafers available, i.e. it is not possible to dope an entire batch of 30 wafers, but both sides of the source wafers are available for doping. It is necessary to activate the source wafers before use by heating them for 1 hour at the temperature needed during the pre-deposition (but never at a temperatures lower than 1050 C). During the pre-deposition a boron phase layer is created on the silicon wafers. This layer can be removed in BHF, if argon is used instead of nitrogen for the pre-deposition (at temperatures higher then 1050 C), otherwise the wafers have to be oxidized before the BHF etch. | ||
The Boron Drive-in and Pre-dep furnace is the top furnace tube in the furnace A-stack positioned in cleanroom B-1. The furnaces in the A-stack are the cleanest of all furnaces in the cleanroom. Please be aware of that all wafers have to be RCA cleaned before they enter the furnace, and please check the cross contamination information in LabManager before you use the furnace. | The Boron Drive-in and Pre-dep furnace is the top furnace tube in the furnace A-stack positioned in cleanroom B-1. The furnaces in the A-stack are the cleanest of all furnaces in the cleanroom. Please be aware of that all wafers have to be RCA cleaned before they enter the furnace, and please check the cross contamination information in LabManager before you use the furnace. Before boron pre-deposition, also the source wafers and a dedicated carbide boat have to be RCA cleaned. | ||
'''The user manual, quality control instruction and results, technical information and contact information can be found in LabManager:''' | '''The user manual, quality control instruction and results, technical information and contact information can be found in LabManager:''' | ||
'''[http://www.labmanager.danchip.dtu.dk/function.php?module=Machine&view=view&mach=47 Boron Drive-in | '''[http://www.labmanager.danchip.dtu.dk/function.php?module=Machine&view=view&mach=47 Boron Drive-in and Pre-dep furnace (A1)]''' | ||
==Process knowledge== | ==Process knowledge== | ||