Photolithography


Photolithography is to reproduce an image on a coated substrate with a layer of photosensitive material (photoresist). This layer undergoes a chemical transformation under the effect of ultra violet radiation; the irradiated area will see its solubility increase or decrease depending on the type of resist (+ or-). This phase is the revelation. The part of the substrate stripped may then suffer various treatments: etching, deposition, settlements of ions...


Organization

The area is free service

Any person wishing to work must undergo training on equipment after having signed the “Charte of the user of the Photolithography and chemistry areas".


The Photolithography area is composed of 32 equipment on an area of 90 m2 class 100. 

It includes 2 independent parties, a manual and an automated:

  • Manual part within an HMDS oven, 3  Gyrset spin coaters and various annealing systems (ovens, hot plates), 3 masks aligners including 2 double-sided equipments dedicated to not exceeding 4 "diameter  substrates.
  • Automatic part, within an HMDS oven, a system for coating and development of resists (EVG 120), a double-side mask aligner with automatic alignment (EVG 620), a semi automatic (Suss Microtec MA 150) mask aligner, dedicated to 4” and 6” diameter substrates.


Equipments



Resist benches

Equiped with a total of 2 SUSS MICROTEC hot plates with ascent and descent ramp and 6 Micro Systems Ltd hot plates. .


Spin coating
4 spin coaters; 3 Gyrset et 1 classicla
2 mask aligners MJB32 (right)
1 mask aligner MA6
Ovens (on the left)
1  HMDS
2 drying 100°C et 200°C
1 with hygrometric control

Automated equipments



Enduction/development tracks
 EVG 620 Mask aligner

MA 150 Mask aligner  
 
CO2 supercritical drying
Tousimis

Separex

Know how

The main photosensitive materials used are:

  • positive  Clariant (AZ 1505, AZ1529, AZ4562, ECL 3012),
  •  Clariant lift off (AZ 5214); AZ N lof2035),
  • Shipley (RPD 220) for thicknesses ranging from 0.5µm to 20µm. 
  • Negative resists Microchem (SU8 3005, 3025, 3050, 2075) for thicknesses ranging from 1µm to 500µm; 
  • A photosensitive polyimide Dow Chemical (BCB) for thicknesses of 2.5µm and µm.







Negative
SU8 - 10µm
SU8 10 µm







Negative
SU8 - 25µm
SU8 25µm







Negative
SU8 - 50µm
SU8 50µm







Negative
SU8 - 100µm
Negative
SU8 - 500µm
Positive
AZ 4562 - 10µm
Positive
ECI 2.6µm

Positive
ECI 2cvc

Lift off NLOF 5µm
ECI 1.2µm for by lithoprojection

AZ 40XT 20µm

ECI 1.2µm + LOR 3A 350nm

Stepper


 
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