Specific Process Knowledge/Lithography/ZEP520A: Difference between revisions

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These tests are currently in progress and this page thus under construction. If you have questions to the process or wish to use this e-beam resist, please contact Tine Greibe at tigre@danchip.dtu.dk.




== Process Flow ==
This is a standard positive resist from ZEON. The resist is very expensive; DTU Nanolab has thus stopped buying this resist.
Test of ZEP resist; a positive e-beam resist from ZEON.
Use CSAR instead.


{|border="1" cellspacing="0" cellpadding="3" style="text-align:left;"
Contact lithography@nanolab.dtu.dk if you wish to use this resist.
|-
 
|-
|-style="background:Black; color:White"
!Equipment
!Process Parameters
!Comments
!Initials and date
|-
 
|-
|-style="background:WhiteSmoke; color:black; text-align:center"
!colspan="4"|Pretreatment
|-
 
 
|-
|-style="background:LightGrey; color:black"
|4" Si wafers
|No Pretreatment
|
|TIGRE, 23-04-2014
|-
 
|-
|-style="background:WhiteSmoke; color:black; text-align:center"
!colspan="4"|Spin Coat
|-
 
 
|-
|-style="background:LightGrey; color:black"
|Spin Coater Manual, LabSpin, A-5
|ZEP520A 1:1 or ZEP520A 1:2 E-beam resist
60 sec at various spin speed.
Acceleration 4000 s-2,
softbake 2 min at 180 deg Celcius
|Resist poured directly from bottle or disposable pipette
|TIGRE, 23-04-2014 and 21-05-2014
|-
 
|-
|-style="background:WhiteSmoke; color:black; text-align:center"
!colspan="4"|Characterization
|-
 
|-
|-style="background:LightGrey; color:black"
|Ellipsometer VASE B-1
|9 points measured on 100 mm wafer
|ZEP program used; measured at 70 deg only
|TIGRE, 23-04-2014 and 21-05-2014
|-
 
|-
|-style="background:WhiteSmoke; color:black; text-align:center"
!colspan="4"|E-beam Exposure
|-
 
 
|-
|-style="background:LightGrey; color:black"
|JEOL 9500 E-beam writer, E-1
|Dosepattern 14nm - 100nm,
dose 120-280 muC/cm2
|Virtual chip mark height detection
| TIGRE
|-
 
|-
|-style="background:WhiteSmoke; color:black; text-align:center"
!colspan="4"|Development
|-
 
|-
|-style="background:LightGrey; color:black"
|Fumehood, D-3
|60 sec in N50,
60 sec rinse in IPA,
N2 Blow dry
|Agitation (by hand) while developing
| TIGRE, XX-04-2014
|-
 
|-
|-style="background:WhiteSmoke; color:black; text-align:center"
!colspan="4"|Characterization
|-
 
|-
|-style="background:LightGrey; color:black"
|Zeiss SEM Supra 60VP, D-3
|
|
| TIGRE, ??-04-2014
|-
 
|}


== Spin Curves ==
== Spin Curves ==




[[File:SpinCurveZEP520A.jpg|right|700px]]
[[File:SpinCurveZEP520A.png|right|700px]]




The thickness is measured on VASE Ellipsometer using a simple Cauchy model for a transparent polymer on a Si wafer with native oxide. The measurements are performed at one incidence angle (70 degrees) only. 9 points on each 4" wafer has been measured; the standard deviation thus representing the homogeinity of the film on the 4" wafers.
The thickness is measured on VASE Ellipsometer using a simple Cauchy model for a transparent polymer on a Si wafer with native oxide. The measurements are performed at one incidence angle (70 degrees) only. 9 points on each 4" wafer has been measured; the standard deviation thus represents the homogeinity of the film on the 4" wafers.


{|border="1" cellspacing="0" cellpadding="3" style="text-align:left;"  style="width: 40%"
{|border="1" cellspacing="0" cellpadding="3" style="text-align:left;"  style="width: 40%"
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|-
|-
|-style="background:Black; color:White"
|-style="background:Black; color:White"
!colspan="7"|ZEON ZEP520A1:1 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 23-04-2014. Resist was mixed 13-01-2014, i.e. approximatley 3 months old.
!colspan="7"|ZEON ZEP520A1:1 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 23-04-2014. Resist was mixed 13-01-2014, i.e. approximately 3 months old.
|-
|-


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|-
|-
|-style="background:red; color:White"
|-style="background:red; color:White"
!colspan="7"|ZEON ZEP520A1:1 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 21-05-2014. Resist was mixed 15-05-2014, i.e. approximatley 6 days old.
!colspan="7"|ZEON ZEP520A1:1 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 21-05-2014. Resist was mixed 15-05-2014, i.e. approximately 6 days old.
|-
|-


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|-
|-
|-style="background:green; color:White"
|-style="background:green; color:White"
!colspan="7"|ZEON ZEP520A1:2 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 21-05-2014. Resist was mixed 15-05-2014, i.e. approximatley 6 days old.
!colspan="7"|ZEON ZEP520A1:2 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 21-05-2014. Resist was mixed 15-05-2014, i.e. approximately 6 days old.
|-
|-


Latest revision as of 20:34, 25 November 2019


This is a standard positive resist from ZEON. The resist is very expensive; DTU Nanolab has thus stopped buying this resist. Use CSAR instead.

Contact lithography@nanolab.dtu.dk if you wish to use this resist.

Spin Curves


The thickness is measured on VASE Ellipsometer using a simple Cauchy model for a transparent polymer on a Si wafer with native oxide. The measurements are performed at one incidence angle (70 degrees) only. 9 points on each 4" wafer has been measured; the standard deviation thus represents the homogeinity of the film on the 4" wafers.

ZEON ZEP520A1:1 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 23-04-2014. Resist was mixed 13-01-2014, i.e. approximately 3 months old.
Spin Speed [rpm] Acceleration [1/s2] Thickness [nm] St Dev
3000 4000 111.29 0.65
4000 4000 95.17 2.16
5000 4000 87.23 0.81


ZEON ZEP520A1:1 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 21-05-2014. Resist was mixed 15-05-2014, i.e. approximately 6 days old.
Spin Speed [rpm] Acceleration [1/s2] Thickness [nm] St Dev
2000 4000 141.03 1.02
3000 4000 115.96 0.98
4000 4000 100.56 0.80
5000 4000 91.01 0.38
6000 4000 84.85 0.37


ZEON ZEP520A1:2 in anisole spinning on Spin Coater: Manual LabSpin A-5, TIGRE, 21-05-2014. Resist was mixed 15-05-2014, i.e. approximately 6 days old.
Spin Speed [rpm] Acceleration [1/s2] Thickness [nm] St Dev
2000 4000 79.12 1.74
3000 4000 64.30 0.34
4000 4000 55.50 0.48
5000 4000 50.53 0.62
6000 4000 46.34 1.01
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