Direct electrospray patterning deposition for flexible organic devices

Organic electronic devices are attracting much attention because of their ease of thin-film processing such as inkjet printing. In general, the electrospray deposition (ESD) method is useful for forming uniform thin films. In the present study, we propose a new direct-patterning ESD method in which an electric field is applied between a syringe needle and a patterned counter electrode. Patterned organic semiconductor films were formed on flexible insulator substrates overlying the counter electrodes. In addition, we show that the width of the patterned organic film could be controlled by varying the applied electric field between the syringe needle and counter electrode.