Effects of Oxygen on the Photocarrier Dynamics in C60: Studies of Transient Photoconductivity and Transient Photoinduced Absorption

Abstract

The intrinsic dynamics of photoexcited carriers in oxygen-free C60 film and their remarkable evolution as the film is exposed to oxygen are revealed by transient photoconductivity (PC) and transient photoinduced absorption (PA) measurements at various temperatures, light intensities and photon energies. We demonstrate that exposure C60 film to oxygen creates deep traps which effectively localize the photocarriers, and in particular strongly effecting the long-lived transport mechanism.