Exploring the ultrasonic nozzle spray-coating technique for the fabrication of solution-processed organic electronics
- Authors
- Han, Singu; Jeong, Heejeong; Jang, Hayeong; Baek, Seolhee; Kim, Se hyun; Lee, Hwa Sung
- Issue Date
- Oct-2017
- Publisher
- Elsevier BV
- Keywords
- Conducting polymer; Organic electronics; PEDOT:PSS; Solution process; Ultrasonic nozzle spray
- Citation
- Organic Electronics, v.49, pp.212 - 217
- Indexed
- SCIE
SCOPUS
- Journal Title
- Organic Electronics
- Volume
- 49
- Start Page
- 212
- End Page
- 217
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/11593
- DOI
- 10.1016/j.orgel.2017.06.061
- ISSN
- 1566-1199
- Abstract
- The ultrasonic nozzle (US) spray method was investigated for its utility in fabricating organic electrodes composed of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), a standard conductive polymer material used to produce large-area low-cost OFETs. The US spray technique involves generating a solution spray by first passing the solution through a head and nozzle subjected to ultrasonic vibrations that induce atomization. This method is advantageous in that the resulting spray comprises extremely small solution droplets a few micrometers in diameter, unlike the spray produced using conventional air spray methods. The PEDOT:PSS US solution spraying process was optimized by controlling the flow rate of the N2 carrier gas and the substrate temperature while monitoring the quality of the resulting PEDOT:PSS electrode films. The pentacene field-effect transistors prepared using the US spray method displayed a maximum field-effect mobility of 0.47 cm2V−1s−1 (with an average value of 0.31 cm2V−1s−1), 35% better than the mobilities achieved using the conventional air spray method. In addition, the device-to-device reproducibility was improved, as indicated by a decrease in the standard deviation of the mobility values from 30% for the air spray devices to 24% for the US spray devices. These results indicated that the US spray technique is efficient and superior to the conventional air spray method for the development of low-cost large-area organic electronics. © 2017 Elsevier B.V.
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