Electrical properties of spin coated PMMA for OFETs applications

Poly (methy-methacrylate) (PMMA) thin films were deposited by sol-gel spin coating method on glass substrates. PMMA powder was dissolved in 60ml Toluene with the concentration of the PMMA in the solution was varied from 30 ∼ 120 mg. Besides the PMMA concentration, we also studied the effect of the thin films thickness on the electrical properties. The results for electrical properties showed that there is a difference of the I–V, resistivity, conductivity and the dielectric constant with different thickness. Conductivity of the PMMA thin film was found to ∼ 10
⁻⁶
Ωcm and continue to decrease as the PMMA concentration increased. Pinholes were identified to be formed on the films with the higher density due to the increasing PMMA concentration.