Abstract
The influence of oxygen and light on the energy level alignment of a poly(3-hexylthiophene)/fullerene blend film used in organic photovoltaic devices is studied. Changes of the electronic structure as well as of the element distribution during the degradation under well-defined conditions are investigated simultaneously using X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. The valence energy level alignment in the blend was studied via core level shifts related to P3HT and the fluorinated fullerene, assuming a constant energetic separation between the corresponding core level and the HOMO (highest occupied molecular orbital). Upon exposure to oxygen and light, two different oxygen species were identified: a reversibly bound species which is responsible for the p-doping of the blend and an irreversibly formed species which corresponds to the photooxidation of the blend. P-doping lowers the common Fermi energy of the blend, leading to identical reductions in binding energies for...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
