Pedersen, Emil Bøje Lind4; Tromholt, Thomas3; Madsen, Morten Vesterager1; Böttiger, Arvid P.L.5; Weigand, M.6; Krebs, Frederik C1; Andreasen, Jens Wenzel1
1 Department of Energy Conversion and Storage, Technical University of Denmark2 Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark3 Functional organic materials, Department of Energy Conversion and Storage, Technical University of Denmark4 DTU Admission Course, Technical University of Denmark5 Risø National Laboratory for Sustainable Energy, Technical University of Denmark6 Max Planck Institute
Using X-ray absorption the effects of photodegradation in active layer materials for polymer solar cells are investigated. Through the observation of changes in the X-ray absorption energy spectra the degradation of the individual components is tracked in blends of poly-3-hexyl-thiophene (P3HT) and C60 butyric acid methyl ester (PCBM). The degradation rates in the blend are decreased by a factor of 3 for P3HT and by a factor between 1.1 and 2.3 for PCBM compared to the pure materials. For P3HT, degradation is resolved spatially using scanning transmission X-ray microscopy and the photodegradation process is found to be intrinsically homogeneous at the nanometer scale.
Journal of Materials Chemistry C, 2014, Vol 2, p. 5176-5182