Printed Water-Based ITO Nanoparticle via Electrohydrodynamic (EHD) Jet Printing and Its Application of ZnO Transistors
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An electrohydrodynamic jet (EHD) printing process was optimized for the patterning of an indium tin oxide (ITO) nanoparticles ink by manipulating its surface tension through the addition of a nonionic surfactant, Triton X-100 (TX-100). As a result, a stable cone-jet mode was performed, which could provide printed drops with the smallest diameter and printing fidelity among EHD jet printing modes, and lead to a line width ranging from 230 µm to 30 µm in addition to well-define patterns with various shapes for ITO transparent conducting electrodes (TCEs). The multi-printing technique and subsequent thermal annealing for printed ITO TCEs allows improvement in its electrical conductivity. In addition, the evolution of the chemical composition and crystalline structure of the printed ITO TCE according to the annealing temperature was investigated to determine the optimal conditions to utilize printed ITO nanoparticles for ZnO-based thin-film transistors.
KeywordsIndium tin oxide Electrohydrodynamic jet printing ZnO thin-film transistor
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2015R1D1A3A01019009) and “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20174030201760). This research was also supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (2018R1A6A1A03023788).