While charge carrier dynamics and thermal management are both keys to the operational
efficiency and stability for energy-related devices, experimental techniques that can
simultaneously characterize both properties are still lacking. In this paper, we use laser-
induced transient grating (TG) spectroscopy to characterize thin films of the archetypal
organic semiconductor regioregular poly (3-hexylthiophene) and its blends with the electron
acceptor [6, 6]-phenyl-C61-butyric acid methyl ester on glass substrates. While the thermal …