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Improved electron injection in poly(-dioctylfluorene)- co-benzothiodiazole via cesium carbonate by means of coannealing
12.M. K. Fung, S. L. Lai, S. W. Tong, S. N. Bao, C. S. Lee, W. W. Wu, M. Inbasekaran, J. J. O’Briend, and S. T. Lee, J. Appl. Phys. 94, 5763 (2003).
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We investigate the electron-injecting properties of a ZnO substrate modified by a thin layer of solution-processed into poly(-dioctylfluorene)-co-benzothiodiazole (F8BT). Ultraviolet photoemission spectroscopy studies reveal that in the case of coannealed F8BT/films, the Fermi level is pinned at the lowest unoccupied molecular orbital of the F8BT, indicating significant n-doping of the polymer.X-ray photoemission spectroscopymeasurements reveal the presence of in the coannealed F8BT/films. I-V measurements in single carrier devices show a significant improvement in the electron injection of the coannealed F8BT/, in agreement with the observed n-doping of the polymer upon coannealing.
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