Low temperature atomic layer deposition of zirconium oxide for inkjet printed transistor applications
Jewel, Mohi Uddin
Mahmud, MD Shamim
Monne, Mahmuda Akter
Chen, Maggie Yihong
Royal Society of Chemistry
We report the growth of zirconium oxide (ZrO2) as a high-k gate dielectric for an inkjet-printed transistor using a low-temperature atomic layer deposition (ALD) from tetrakis(dimethylamido)zirconium (TDMAZr) and water precursors. All the samples are deposited at low-temperature ranges of 150–250 °C. The films are very uniform with RMS roughness less than 4% with respect to their thickness. The atomic force microscopy (AFM) shows a significant change in surface morphology from tapered posts to undulating mountain-like structures with several hundreds of ALD cycles. The results from X-ray diffraction (XRD) analysis exhibit an amorphous to the crystalline structure with temperature variation, which is independent of the thickness of the films. All our samples are hydrophilic as contact angles are less than 90°. The capacitance–voltage (C–V) and conductance–voltage (Gp/ω–V) characteristics of ZrO2 dielectrics for silicon metal–oxide–semiconductor (MOS) capacitors are studied for different temperatures. For the n-type substrate MOS capacitors, the dielectric constants are estimated to be 7.5–11. Due to the low deposition temperature, a hydrophilic surface, and high k value, the ALD-ZrO2 dielectric can be compatible for printed transistors. The processes of fabrication and characterization of inkjet-printed graphene transistors is demonstrated using the ZrO2 dielectric. The possible solvents, surfactant, and the dielectric induced modifications in graphene flakes are demonstrated by Raman spectra. The graphene flakes spread uniformly on the ZrO2 surface. The functional inkjet-printed graphene transistor characteristics are demonstrated to illustrate the field effect behavior with the ALD-ZrO2 dielectric.
atomic layer deposition, inkjet printer transistor applications, low temperature, zirconium oxide, Ingram School of Engineering
Jewel, M. U., Mahmud, M. S., Monne, M. A., Zakhidov, A., & Chen, M Y. (2019). Low temperature atomic layer deposition of zirconium oxide for inkjet printed transistor applications. RSC Advances, 2019(9), pp. 1841-1848.
© The Royal Society of Chemistry 2019.
This work is licensed under a Creative Commons Attribution 4.0 International License.