In-Situ-PEDT-Layer:
CLEVIOS™ CB (Fe(III)tosylate in butanol) CLEVIOS™ P (PEDT:PSS) or Silquest A187 (Polyepoxysilane)

Note: The adhesion layer is necessary, especially for deposition on glass. Without adhesion layer the In-Situ-PEDT layers will peel off most probably during the washing step. The adhesion should have a thickness of 10-20nm.

a) CLEVIOS™ P as adhesion layer

CLEVIOS™ P AI4083 or. CLEVIOS™ P CH8000 are spin-coated as a 10-20nm thick film onto a glass substrate and subsequently baked at 200° C for about 10min on a hot plate.

b) Polyepoxysilane as adhesion layer
A187 is spin-coated onto a glass substrate (1000rpm, t=120sec, Acc.2, lid closed) or simply dipped in diluted Epoxysilan solution (0.1% A187 in Isopropanol)
and subsequently dried at 50°C for 5min in air . Humidity has an impact on the crosslinking of the epoxysilane. Medium humidity of 30-70% is our preference.

Imidazol are mixed in a weight-ratio of 1 : 25 : 0.5.

In a first step Imidazol is dissolved in CB40. In a second step CLEVIOS™ M is added. The mixture can be filtered by using a syringe filter (0.45µm PDVF).

 

Density:  CLEVIOS™ M : 1,33g/cm³, CB40: 1,03g/cm³

The solution can be spin-coated at spin speeds of 200-3000rpm and thin homogeneous films are formed. On a 50mm x 50mm large substrate the film thickness will be 170nm at 1000rpm, t=30sec , Acc. 2, lid closed.

Drying:  
1. Step: 5min at 50°C on hot plate in air
2. Step: 60min at room temperature in air
humidity level : 30-70%
The film will change colour as EDT polymerises while drying.

 

The films are washed by shaking the substrate in a beaker filled with dist. H2O thoroughly to remove Fe salts. Adhering water is blown off in a N2 flow.

The conductivity can be easily checked by printing two parallel conducting bars (silver glue) on top of the layer and by using a Ohm meter to determine the resistivity. The conductivity will be typically be in the range of 400-600S/cm.

For details:
Dr. Andreas Elschner
H.C.Starck GmbH
c/o Bayer AG,  Geb.B202
D-51368 Leverkusen
Phone: +49 (0) 214-30-70200
Fax: +49 (0) 214-30-25973
e-mail: andreas.elschner@hcstarck.com

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