Gravure-Printed Sol鈥揋els on Flexible Glass: A Scalable Route to Additively Patterned Transparent Conductors

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• 作者：William J. Scheideler ; Jaewon Jang ; Muhammed Ahosan Ul Karim ; Rungrot Kitsomboonloha ; Andre Zeumault ; Vivek Subramanian
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：7
• 期：23
• 页码：12679-12687
• 全文大小：520K
• ISSN：1944-8252

文摘

Gravure printing is an attractive technique for patterning high-resolution features (<5 渭m) at high speeds (>1 m/s), but its electronic applications have largely been limited to depositing nanoparticle inks and polymer solutions on plastic. Here, we extend the scope of gravure to a new class of materials and on to new substrates by developing viscous sol鈥揼el precursors for printing fine lines and films of leading transparent conducting oxides (TCOs) on flexible glass. We explore two strategies for controlling sol鈥揼el rheology: tuning the precursor concentration and tuning the content of viscous stabilizing agents. The sol鈥揼el chemistries studied yield printable inks with viscosities of 20鈥?60 cP. The morphology of printed lines of antimony-doped tin oxide (ATO) and tin-doped indium oxide (ITO) is studied as a function of ink formulation for lines as narrow as 35 渭m, showing that concentrated inks form thicker lines with smoother edge morphologies. The electrical and optical properties of printed TCOs are characterized as a function of ink formulation and printed film thickness. XRD studies were also performed to understand the dependence of electrical performance on ink composition. Printed ITO lines and films achieve sheet resistance (R_s) as low as 200 and 100 惟/鈻? respectively (蟻 鈮?2 脳 10^鈥? 惟-cm) for single layers. Similarly, ATO lines and films have R_s as low as 700 and 400 惟/鈻?with 蟻 鈮?7 脳 10^鈥? 惟-cm. High visible range transparency is observed for ITO (86鈥?8%) and ATO (86鈥?9%). Finally, the influence of moderate bending stress on ATO films is investigated, showing the potential for this work to scale to roll-to-roll (R2R) systems.