期刊
ORGANIC ELECTRONICS
卷 69, 期 -, 页码 190-199出版社
ELSEVIER
DOI: 10.1016/j.orgel.2019.03.025
关键词
Cone-jet printing; AgNWs/PEO composite electrodes; Organic thin film transistors; Printed electronics
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2017R1A1A1A05001233]
- 2018 Research Fund of the University of Seoul
Aligned silver nanowire (AgNWs) conductive electrodes are printed through an electrohydrodynamic (EHD) jet printing via cone-jet mode. We investigate effects of poly(ethylene oxide) (PEO) addition to AgNW inks in terms of surface energy, ink viscosity, and electrical conductivity. The optimized PEO content in the ink is determined to be similar to 10 wt%, at which well-defined AgNWs/PEO composite electrodes aligned along the printing direction can be prepared by cone-jet mode of EHD jet printing. We fabricate bottom contact organic thin film transistors (OTFTs) with TIPS-pentacene/PS blend as a semiconducting layer to take advantage of printed AgNWs/PEO electrodes. The resulting devices exhibit stable transfer characteristics for 12 h even in ambient air with average field-effect mobility (mu(FET)), threshold voltage (V-th) and on/off current ratio (I-on/I-off)of 0.51 cm(2)/V, -2.0 V, and similar to 10(6), respectively. To understand the characteristics of OTFTs based on AgNWs/PEO composite electrodes in detail, we examine crystalline morphology and molecular orientation of TIPS-pentacene/PS blend on various substrates through field emission scanning electron microscopy and two-dimensional grazing incidence X-ray diffraction, respectively.
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