Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3564903
Title: Improved electron injection in poly(9, 9′ -dioctylfluorene)- co-benzothiodiazole via cesium carbonate by means of coannealing
Authors: Vaynzof, Y.
Kabra, D.
Chua, L.L. 
Friend, R.H. 
Issue Date: 14-Mar-2011
Citation: Vaynzof, Y., Kabra, D., Chua, L.L., Friend, R.H. (2011-03-14). Improved electron injection in poly(9, 9′ -dioctylfluorene)- co-benzothiodiazole via cesium carbonate by means of coannealing. Applied Physics Letters 98 (11) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3564903
Abstract: We investigate the electron-injecting properties of a ZnO substrate modified by a thin layer of solution-processed Cs2 CO3 into poly(9, 9′ -dioctylfluorene)-co-benzothiodiazole (F8BT). Ultraviolet photoemission spectroscopy studies reveal that in the case of coannealed F8BT/ Cs2 CO3 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 spectroscopy measurements reveal the presence of Cs2 CO3 in the coannealed F8BT/ Cs2 CO 3 films. I-V measurements in single carrier devices show a significant improvement in the electron injection of the coannealed F8BT/ Cs2 CO3, in agreement with the observed n-doping of the polymer upon coannealing. © 2011 American Institute of Physics.
Source Title: Applied Physics Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/94007
ISSN: 00036951
DOI: 10.1063/1.3564903
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