Difference between revisions of "PECVD SiNx via CHF3 + O2"

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== Goal ==
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== Process description ==
  
Process description
+
This process is performed to measure the etch rate of PECVD SiNx using an Oxford 80 plus RIE tool. Lithography equipment and material used in this study can be substituted by others that would result in a similar pattern.
This process is performed to measure the etch rate of PECVD SiNx using an Oxford 80 plus RIE tool. Lithography equipment and material used in this study can be substituted by others that would result in a similar pattern.  
 
  
== Materials ==
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recipe name on the tool: '''00_Staff_CHF3/O2'''
* Microchem S1818 Photoresist
 
* Microchem MF-319 Developer
 
* 4 inch Silicon Wafers
 
  
 
== Equipment ==
 
== Equipment ==
  
* Torrey Pines Scientific hotplate
 
* ReynoldsTech spinner
 
 
* [[Oxford PlasmaLab 100 PECVD]]
 
* [[Oxford PlasmaLab 100 PECVD]]
 
* [[Oxford 80 Plus RIE]]
 
* [[Oxford 80 Plus RIE]]
* [[SUSS MicroTec MA6 Gen3 Mask Aligner]]
 
  
 
== Units ==
 
== Units ==
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* Temperature: degrees Celsius (C)
 
* Temperature: degrees Celsius (C)
 
* High frequency (RF) power: Watts (W)
 
* High frequency (RF) power: Watts (W)
 +
 +
== Materials ==
 +
* [[Resists at QNF|Microchem S1818 Photoresist]]
 +
* [[Developers at QNF|Microchem MF-319 Developer]]
 +
* 4 inch Silicon Wafers
  
 
== Protocol ==
 
== Protocol ==
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=== Expose ===
 
=== Expose ===
  
1. Use the photomask to expose the wafer at 150 mJ/cm2 Develop
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1. Use the photomask to expose the wafer at 150 mJ/cm2  
  
1. Dispense approximately 150 milliliters of AZ300 MIF developer into a six inch cylindrical container.
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1. Dispense approximately 150 milliliters of MF-319 developer into a six inch cylindrical container.
  
 
2. Fully submerge the exposed wafer.
 
2. Fully submerge the exposed wafer.
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1. Pump to 5e-04 Torr, “Pump to Pressure” checked.
 
1. Pump to 5e-04 Torr, “Pump to Pressure” checked.
  
2. Etch Step
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2. Etch Step (etch recipe done via recipe named: '''00_Staff_CHF3/O2''' on the QNF tool)
  
 
* Trifluoromethane (CHF3) flow rate: 100 sccm Oxygen (O2) flow rate: 4 sccm
 
* Trifluoromethane (CHF3) flow rate: 100 sccm Oxygen (O2) flow rate: 4 sccm
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* RF Power: 150 W
 
* RF Power: 150 W
 
* Capacitor starting points: Capacitor #1: 60 %, Capacitor #2: 80 %
 
* Capacitor starting points: Capacitor #1: 60 %, Capacitor #2: 80 %
 
  
 
== Results ==
 
== Results ==

Latest revision as of 14:47, 16 September 2024

Process description

This process is performed to measure the etch rate of PECVD SiNx using an Oxford 80 plus RIE tool. Lithography equipment and material used in this study can be substituted by others that would result in a similar pattern.

recipe name on the tool: 00_Staff_CHF3/O2

Equipment

Units

  • Gas flow rate: standard cubic centimeters per minute (sccm)
  • Pressure: milliTorr (mT)
  • Temperature: degrees Celsius (C)
  • High frequency (RF) power: Watts (W)

Materials

Protocol

Coat

1. Mount wafer and ensure that it is centered.

2. Deposit 7 milliliters of S1818 photoresist in the center of the wafer.

3. Spin on photoresist at 4500 RPM for 60 Seconds.

Soft Bake

1. Bake wafer at 115 °C for 60 seconds.

Expose

1. Use the photomask to expose the wafer at 150 mJ/cm2

1. Dispense approximately 150 milliliters of MF-319 developer into a six inch cylindrical container.

2. Fully submerge the exposed wafer.

3. Agitate and develop the wafer for 60 seconds.

Etch

1. Pump to 5e-04 Torr, “Pump to Pressure” checked.

2. Etch Step (etch recipe done via recipe named: 00_Staff_CHF3/O2 on the QNF tool)

  • Trifluoromethane (CHF3) flow rate: 100 sccm Oxygen (O2) flow rate: 4 sccm
  • Pressure: 50 mT
  • RF Power: 150 W
  • Capacitor starting points: Capacitor #1: 60 %, Capacitor #2: 80 %

Results

RIE CF4 etch rate 2min SiN LPCVD 07292024.png

etch rate ~ 60 nm/min - measured on a 4" wafer on July 29th, 2024

Side SEM of a two step SiNx etch, totaling ~ 12 minutes

SiN etch on DE-04.png