FET Mobility Versus Iodine Doping of P3HT

Polymers as the active layer for organic field effect transistors (OFETs) are inherently flexible, lightweight, cost-effective, biocompatible, and processing can be very versatile. Doping can drastically change and modulate the electronic properties of semiconductors and enable tunable FET devices. In this work, the charge mobility in a p-type conjugated polymer Poly-3-hexyl-thiophene (P3HT) doped by iodine are being evaluated. Preliminary results shows that the FET charge mobility initially increases at low doping concentrations but decreases at high doping concentrations. Mechanisms of such trend are being evaluated.