Specific Process Knowledge/Lithography

From LabAdviser

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There are four different types of lithography available at DTU Nanolab:


Comparing lithography methods at DTU Nanolab

UV Lithography DUV Stepper Lithography E-beam Lithography Nano Imprint Lithography
Generel description Pattern transfer via UltraViolet (UV) light Pattern transfer via Deep UltraViolet (DUV) light Patterning by electron beam Pattern transfer via hot embossing (HE)
Pattern size range

~0.6 µm and up
(resist type, thickness, and pattern dependent)

~200 nm and up
(pattern type, shape and pitch dependent)

~12 nm - 1 µm
(and larger at high currents)

~20 nm and up

Resist type

UV sensitive:

  • AZ 5214E, AZ 4562, AZ MiR 701 (positive)
  • AZ 5214E, AZ nLOF 2020, SU-8 (negative)

DUV sensitive

  • JSR KRF M230Y, JSR KRF M35G (positive)
  • UVN2300-0.8 (negative)

E-beam sensitive

  • AR-P6200 CSAR, ZEP502A , PMMA (positive)
  • HSQ, mr-EBL, AR-N 7520 (negative)

Imprint polymers:

  • Topas
  • PMMA
  • mr-I 7030R
Resist thickness range

~0.5 µm to 200 µm

~50 nm to 2 µm

~30 nm to 1 µm

~ 100 nm to 2 µm

Typical exposure time

10 s - 3 min pr. wafer using mask aligners
10 min - 5 hours pr. wafer using maskless aligners

Process dependent:

  • Pattern
  • Pattern area
  • Dose

Throughput is up to 60 wafers/hour

Process dependent:

  • Dose, Q [µC/cm2]
  • Beam current, I [A]
  • Pattern area, a [cm2]

time [s] = Q*a/I

Process dependent, including heating/cooling rates

Substrate size
  • chips down to 3 mm x 3 mm
  • 50 mm wafers
  • 100 mm wafers
  • 150 mm wafers
  • 200 mm wafers
  • 100 mm wafers
  • 150 mm wafers
  • 200 mm wafers

We have cassettes fitting:

  • 4 small samples (slit openings: 20mm, 12mm, 8mm, 4mm)
  • 6 wafers of 50 mm in size
  • 3 wafers of 100 mm in size
  • 1 wafer of 150 mm in size
  • 1 wafer of 200 mm in size

Only one cassette can be loaded at a time

  • small samples
  • 50 mm wafers
  • 100 mm wafers
  • 150 mm wafers
Allowed materials

Any standard cleanroom material

Any standard cleanroom material

Any standard cleanroom material, except:

  • Materials that will degas
  • Graphene requires special treatment

Any standard cleanroom material


Equipment Pages

Resist

Pretreatment

Coating

Baking

UV Exposure

Deep-UV Exposure

Electron Beam Exposure

NanoImprint Lithography


Development

Descum

Lift-off

Strip


Lithography Tool Package Training

DTU Nanolab offers a Tool Package Training in Lithography; the course includes theory on lithographic processes and equipment. After the TPT has been successfully completed, you can begin training on the lithography equipment at DTU Nanolab.

You are required to pass this course, in order to get access to using the lithography equipment inside the DTU Nanolab fabrication facility (The Cleanroom).

For details, dates, and course material, please check the course description under Courses.


Lithography Tool Package Training
Signing up for the course

The course is in DTU Learn. You sign up for the course by enroling yourself in the course "DTU Nanolab TPT: Lithography".

  • Log into DTU Learn here: DTU Learn
  • Select the menu "Discover"
  • Search for "Nanolab"

Select the course "DTU Nanolab TPT: Lithography"

  • Press "Enroll in Course"
  • You have now signed up for the course.
  • Go to the course page in DTU Learn and choose "Course Content" and "Content"
  • Watch the lecture videos, read the learning material, and complete all the quizzes.
Learning Objectives

Learn about the fundamentals of lithographic processing in a cleanroom:

  • Coating
  • Exposure
  • Development
  • Post-processing


Knowledge and Information about Lithography

Literature


Lecture videos

  • Lithography TPT lecture videos (7 videos, 2:41 hours in total) on YouTube
  • A full lecture series from a UT Austin course on microfabrication by "litho guru" Chris Mack. Half of the lectures are on (projection) lithography :-)


Lithography TPT lecture slides

Training videos

Playlists on YouTube:


Manuals


Process Flows


Resists


UV Exposure


Electron Beam Exposure


Deep-UV Exposure


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