Abstract
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.
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