We demonstrated the smooth surface roughness of the poly[9,9-dioctylfluorenyl-2,7-dlylJ-co-1,4-benzo-(2,1,3)-thi adiazole (F8BT) thin film fabricated by the electrospray deposition technique. The root mean square roughness of the F8BT thin film was reduced by the addition of dimethyl sulfoxide in tetrahydrofuran. Furthermore, the organic light-emitting diode was also demonstrated by this method.
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