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Ething of Gold can be done either wet or dry. For wet etching please see below on this page. Dry etching can be done with [[Specific Process Knowledge/Etch/IBE⁄IBSD Ionfab 300|IBE]] by sputtering with Ar ions.  
'''Unless anything else is stated, everything on this page, text and pictures are made by DTU Nanolab.'''


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'''Feedback to this page''': '''[mailto:labadviser@nanolab.dtu.dk?Subject=Feed%20back%20from%20page%20http://labadviser.nanolab.dtu.dk/index.php/Specific_Process_Knowledge/Etch/Etching_of_Gold click here]'''


==Etching of Gold==
==Etching of Gold==
[[Image:fumehoodetch-gold.jpg |300x300px|thumb|Wet Gold Etch: Done in the fumehood positioned in cleanroom 2]]
Etching of Gold is done wet at Danchip making your own set up in a beaker in the fumehood. We have two different solutions:
# Iodine etch: KI:I<sub>2</sub>:H<sub>2</sub>O - 100g:25g:500ml - standard at Danchip. Can be used with AZ resist as mask.
# Aqua Regia (Kongevand): HNO<sub>3</sub>:HCl - 1:3 - A very strong acid witch will etch most metals and are therefore used when you wish to remove all the gold from your wafer. '''you have to be very carefull when you work with Aqua Regia (Kongevand) It can generate nitrous gases witch are very toxic!!'''
===Comparing the two solutions===
{| border="2" cellspacing="0" cellpadding="4" align="left"
!
! Iodine based gold etch
! Aqua Regia (Kongevand)
|-
|'''General description'''
|
Etch of pure Gold with or without photoresist mask.
|
Etch of pure Gold (as stripper).
|-
|'''Chemical solution'''
|KI:I<sub>2</sub>:H<sub>2</sub>O  (100g:25g:500ml)
|HCl:HNO<sub>3</sub>  (3:1)
|-
|'''Process temperature'''
|20 <sup>o</sup>C
|20 <sup>o</sup>C
|-


|'''Possible masking materials'''
Etching of Gold can be done either by wet etch, or by sputtering with ions.
|
*[[Specific Process Knowledge/Etch/Wet Gold Etch|Etching of Gold by wet etch]]
Photoresist (1.5 µm AZ5214E)
*[[Specific_Process_Knowledge/Etch/IBE&frasl;IBSD Ionfab 300/IBE Au etch|Sputtering of Au]]
|
Unmasked - used as a stripper
|-
|'''Etch rate'''
|
~100 nm/min
|
~(??) nm/min - fast etch
|-
|'''Batch size'''
|
1-5  4" wafers at a time
|
1-5 4" wafer at a time
|-
|'''Size of substrate'''
|
2-6" wafers
|
2-6" wafers
|-
|}
 
 
'''Feedback to this page''': '''[mailto:labadviser@danchip.dtu.dk?Subject=Feed%20back%20from%20page%20http://labadviser.danchip.dtu.dk/index.php/Specific_Process_Knowledge/Etch/Etching_of_Gold click here]'''
 
=<span style="background:#FF2800">THIS PAGE IS UNDER CONSTRUCTION</span>[[image:Under_construction.png|200px]]=
 
 
==Etching of Aluminium==
 
Etching of aluminium can be done either by wet etch, dry etch or by sputtering with ions.
*[[Specific Process Knowledge/Etch/Wet Aluminium Etch|Etching of Al by wet etch]]
*[[Specific_Process_Knowledge/Etch/ICP_Metal_Etcher/Aluminium|Etching of Al by dry etch]]
*[[Specific_Process_Knowledge/Etch/IBE&frasl;IBSD Ionfab 300|Sputtering of Al]]
<br clear="all" />
<br clear="all" />


==Comparison of Aluminium Etch Metodes==
==Comparison of Gold Etch Methods==


{|border="1" cellspacing="1" cellpadding="3" style="text-align:left;"  
{|border="1" cellspacing="1" cellpadding="3" style="text-align:left;"  
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|-style="background:silver; color:black"
|-style="background:silver; color:black"
!
!
![[Specific Process Knowledge/Etch/Wet Aluminium Etch|Al wet etch 1]]
![[Specific Process Knowledge/Etch/Wet Gold Etch|Au wet etch 1]]
![[Specific Process Knowledge/Etch/Wet Aluminium Etch|Al wet etch 2]]
![[Specific Process Knowledge/Etch/Wet Gold Etch|Au wet etch 2]]
![[Specific_Process_Knowledge/Etch/ICP_Metal_Etcher|ICP metal]]
![[Specific_Process_Knowledge/Etch/IBE&frasl;IBSD Ionfab 300|IBE (Ionfab300+)]]
![[Specific_Process_Knowledge/Etch/IBE&frasl;IBSD Ionfab 300|IBE (Ionfab300+)]]
|-
|-
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|-style="background:WhiteSmoke; color:black"
|-style="background:WhiteSmoke; color:black"
!Generel description
!Generel description
|Wet etch of pure Al
|Wet etch of Au using iodine based chemistry
|Wet etch of Al + 1.5% Si
|Wet etch of Au using Aqua Regina
|Dry plasma etch of Al
|Sputtering of Au - pure physical etch
|Sputtering of Al - pure physical etch
|-
|-


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!Etch rate range
!Etch rate range
|
|
*~100nm/min (pure Al)
*~100nm/min
|
|
*~60nm/min (Al+1.5% Si)
*680 nm/min (dilute) or faster (concentrated). Mainly used for complete removal of metals
|
|
*~350 nm/min (depending on features size and etch load)
*~55nm/min (acceptance test)  
|
*~30nm/min (not tested yet)  
|-
|-


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*Isotropic
*Isotropic
|
|
*Anisotropic (vertical sidewalls)
*Anisotropic (angles sidewalls, typical around 70 dg)
|-
 
|-style="background:LightGrey; color:black"
!Masking material
|
*Photoresist
|
|
*Anisotropic (angles sidewalls, typical around 70 dg)
*None (mainly used for stripping Au)
|
*Any material that is allowed in the chamber, photoresists included
|-
|-




|-
|-
|-style="background:LightGrey; color:black"
|-style="background:WhiteSmoke; color:black"
!Substrate size
!Substrate size
|
|
*<nowiki>#</nowiki>1-25 100 mm wafers
*Any size and number that can go inside the beaker in use
|
|
*<nowiki>#</nowiki>1-25 100 mm wafers
*Any size and number that can go inside the beaker in use
|
 
*smaller pieces on a carrier wafer
*<nowiki>#</nowiki>1 100mm wafers (when set up to 100mm wafers)
*<nowiki>#</nowiki>1 150mm wafers (when set up to 150mm wafers)
|
|
Smaller pieces glued to carrier wafer
Smaller pieces glued to carrier wafer
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|-
|-
|-style="background:WhiteSmoke; color:black"
|-style="background:LightGrey; color:black"
!'''Allowed materials'''
!'''Allowed materials'''
|
|
*Aluminium
No restrictions cross contamination wise as long as you use the right beaker and make sure that they are safe to enter in the chemicals
*Silicon
*Silicon Oxide
*Silicon Nitride
*Silicon Oxynitride
*Photoresist
*E-beam resist
|
*Aluminium
*Silicon
*Silicon Oxide
*Silicon Nitride
*Silicon Oxynitride
*Photoresist
*E-beam resist
|
|
*Silicon
No restrictions cross contamination wise as long as you use the right beaker and make sure that they are safe to enter in the chemicals
*Quartz/fused silica
*Photoresist/e-beam resist
*PolySilicon,
*Silicon oxide
*Silicon (oxy)nitride
*Aluminium
*Titanium
*Chromium
|
|
*Silicon  
*Silicon  
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