I have tried to use also the PVP as gate insulator but with the same
result. PMMA and PVP are widely used in literature as gate insulator
also in inkjet printing technique.

What kind of treatment can I use to reduce the porosity of this polymer?
Emanuele

Darren Alvares ha scritto:
> Could you have another dielectric layer above the PMMA. Is there any reason
you are using PMMA?
>
> -----Original Message-----
> From: Emanuele Orabona [mailto:[email protected]]
> Sent: Saturday, 6 March 2010 8:20 AM
> To: General MEMS discussion
> Subject: [mems-talk] PMMA as gate insulator
>
> Dear all,
>
> I tried to realize an OTFT using PMMA as gate insulator and PEDOT/PSS
> as electrodes. In the top gate structure the PEDOT/PSS penetrated in
> the PMMA layer creating short circuit with source and drain. I think
> that PMMA layer is porous. I've also tried to change solvents,
> temperatures, deposition conditions, deposition techniques.
>
> How can i solve this problem?
>
> Thank you
> Emanuele