Introduction to Printed Electronics by Katsuaki Suganuma

Author:Katsuaki Suganuma
Language: eng
Format: epub, pdf
Publisher: Springer New York, New York, NY

Fig. 3.19Firing temperature dependence of resistivity of ITO coating [29]. Sn/In = 8 mol % in coatings

Another method is nanoparticle solution inks [34, 35]. Figure 3.20 shows typical ITO nanoparticles [33]. The drawback of using a nanoparticle ink lies in the difficulty of obtaining dense oxide films in a low-temperature sintering process, even at 400 °C, compared to sol-gel processes. Materials of commercial interest include ITO, ATO, and FTO. The sheet resistance reached almost 100 Ω cm, while heat treatment temperatures can reach as high as 500 °C. In addition, heat treatment requires a controlled atmosphere to adjust for oxygen lattice defects, which provides an electric property to oxides. Figure 3.21 shows an example of resistivity change as a function of sintering temperature [34].

Fig. 3.20TEM of ITO nanoparticles (Courtesy of Otsuka Chemical, Osaka, Japan). ITO nanoparticles were obtained by a thermal decomposition of metal alkoxide [29]

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