Equipment & Training Schedule

Technical Contacts

Gehoski, Kathleen

Research and Development Engineer

Technical Lead

kag31@psu.edu
814-865-7443

N106 MILLENNIUM SCI COMPLEX
UNIVERSITY PARK, PA 16802

PSU UserID: 
kag31

Labella, Michael

Litho Process Engineer

mil102@psu.edu
814-863-4339

N106 MILLENNIUM SCI COMPLEX
UNIVERSITY PARK, PA 16802

PSU UserID: 
mil102

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Soft Lithography

µm lines of PZT printed with micro-contact printing.
(Photo Credit: STM group)

Soft lithography involves making a three dimensional structure in a flexible polymer such as PDMS or PU from a master mold of silicon or thick photoresist. The flexible polymer structures can be used for microfluidic channels or a "stamp" for transferring a liquid "ink" which could be a sol-gel or a functionalized chemical.

PDMS structure from SU-8 or KMPR master: This is the simplest of all methods in that it typically uses a low cost transparency mask and contact photolithography to expose a pattern in either SU-8 or KMPR resist on a silicon wafer. This resist/wafer combo is then the master for making the PDMS structure.

PDMS from all silicon master: This method results in a more robust and higher fidelity all silicon master realized by photolithography and deep reactive ion etching of silicon. The PDMS structure is then cast into the robust all silicon master. Poly urethane (PU) structures are usually cast from PDMS sub-molds. The PU has properties that are desirable in certain sol-gel stamping applications.

Equipment/Systems

Karl Suss MBJ3 for micro-contact printing - Imprint & Microcontact

The Karl Suss MJB3 had been coopted to serve as a micro-contact printer of sol-gel mixtures using a polymer "stamp." The complete manual operation of the MJB3 along with its alignment capabilities lends itself well to contact printing of sol-gel "ink". The maximum substrate size is 3" wafers. Most of the stamps are in the inch x inch range. This system is located in the complex oxide sol-gel section of the cleanroom.

Results

Features down to 3µm have been successfully printed.

RIMS Name

Litho: MJB3 (SMIL)

Training

Visit the Equipment & Training Information