Figure 1From: Monitoring Charge Exchange in P3HT-Nanotube Composites Using Optical and Electrical CharacterisationAbsorption spectra for P3HT–SWNT composites of various concentrations. All spectra have been scaled to the 2. eV peak to allow for decreasing film thickness with increasing SWNT concentration. The vertical arrow indicates the energy of the pump beam photons in pump–probe measurements shown in Fig. 2Back to article page