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    Inkjet printing of homogeneous and green cellulose nanofibril dielectrics for high performance IGZO TFTs

    Year: 2020

    Journal: J. Mater. Chem. C, Volume 8, SEP 28, page 12578–12586

    Authors: Zhou, Shangxiong; Zhang, Jianhua; Guo, Xiaoping; Ning, Honglong; Guo, Dong; Yao, Rihui; Zhu, Zhennan; Liang, Zhihao; Fang, Zhiqiang; Peng, Junbiao

    Organizations: Key Area Research and Development Program of Guangdong Province [2019B010934001]; National Science Foundation for Distinguished Young Scholars of ChinaNational Natural Science Foundation of China (NSFC)National Science Fund for Distinguished Young Scholars [51725505]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51771074, 61804029, 61574061]; Major Integrated Projects of the National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [U1601651]; Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]; Guangdong Natural Science FoundationNational Natural Science Foundation of Guangdong Province [2018A030310353, 2020B1515020021]; Science and Technology Project of Guangzhou [201904010344]; Pearl River S&T Nova Program of Guangzhou [201806010141]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [2019MS012]

    Inkjet printing of environmentally friendly functional nanomaterials for high performance indium-gallium-zinc oxide (IGZO) thin film transistors (TFTs) is highly in demand for the development of inexpensive and green electronics. However, it remains challenging to obtain nanomaterial inks with desirable physicochemical properties for inkjet printing and finally to achieve homogeneous in-plane patterns. Here, we present biodegradable and uniform cellulose dielectric films for high performance IGZO TFTsviainkjet printing. Firstly, an oxidized cellulose nanofibril (CNF) was selected due to its stable dispersion in water, and additives were added to obtain CNF ink suitable for our printing system. Moreover, it was found that adding additives also increased the interactions inside the solution, so the obtained CNF ink exhibited a gel-like behavior with a rapidly increasing viscosity after high-speed shearing. Such behavior was defined as fast-self-gelation properties, which were beneficial for improving the uniformity of the printed films by inhibiting the outward capillary flow. Based on these properties, we further added surfactants to regulate the internal flow, and then obtained a homogeneous morphology. Besides the excellent uniformity, the prepared CNF film was a candidate for transparent dielectrics, with excellent transparency (above 95%) and a low leakage current density (3.68 x 10(-6)A cm(-2)). Finally, IGZO-TFTs with a mobility of more than 10 cm(2)V(-1)s(-1)and an on/off current ratio of higher than 5 x 10(4)were fabricated using the printed CNF films as dielectrics, thus shedding light on the use of CNF dielectrics obtained by inkjet printing for the fabrication of high-performance, inexpensive, and environmentally friendly electronics.
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