Temporal and thermal properties of optically induced instabilities in P3HT field-effect transistors

► Optically induced changes in P3HT based organic field-effect transistors. ► Oxygen induces charge transfer states inside the P3HT layer. ► Threshold voltage shifts and p-doping of the P3HT layer. ► Investigation of the temporal relaxation as a function of the temperature. ► Electronic discharge of trap states and oxygen diffusion.