Reversible charge transfer complexes between molecular oxygen and poly(3‐alkylthiophene)s

The interaction of poly(3‐hexylthiophene), P3HT, with oxygen has been investigated. Evidencein the form of UV–vis absorption, electron paramagnetic resonance data, and a field effect conductivity analysis of a polymer‐based field effect transistor–is presented for the existence of a reversible charge transfer complex between P3HT and oxygen. Oxygen‐sensor applications can be foreseen for thin film transistors incorporating P3HT.