Patent ID: 9741953
Date: 2017-08-22
CPC Classifications: H01L

Claim:
1. An organic transistor comprising at least one lower plastic substrate made of a plastic material, a source electrode and a drain electrode respectively disposed above the plastic substrate, a semiconductor layer made of an organic semiconductor material and disposed on top of and in contact with both the source and drain electrodes and disposed above the plastic substrate, a dielectric layer made of a dielectric material and disposed on the semiconductor layer, a gate electrode disposed on the dielectric layer, and a porous layer made of a dielectric material disposed between and contacting both the plastic substrate and the semiconductor layer, the porous layer extending only under a conduction channel of the semiconductor layer and between the source and drain electrodes, to decrease the dielectric constant of the surface of the plastic substrate, wherein the porous layer has a permittivity lower than 3, and wherein the semiconductor layer has a final top surface extending above the source electrode, the drain electrode and an entirety of the porous layer, and the final top surface has a roughness smaller than or equal to 15 nanometers.