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Films Stoichiometry Effects on the Electronic Transport Properties of Solution-Processed Yttrium Doped Indium–Zinc Oxide Crystalline Semiconductors for Thin Film Transistor Applications

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number1900976
<mark>Journal publication date</mark>1/04/2020
<mark>Journal</mark>Advanced Electronic Materials
Issue number4
Number of pages10
Publication StatusPublished
Early online date3/03/20
<mark>Original language</mark>English


Spray-coated crystalline InZnOx-based semiconductors are investigated as a function of [In3+]:[Zn2+] and their performance as TFTs semiconducting channels. More precisely, it is demonstrated that optical, structural, and electron transport properties show a high degree of sensitivity to the films' stoichiometry; that is, the [In3+]:[Zn2+] atomic ratio that equally determines the amorphous or crystalline structure of the film. Yttrium co-doping of InZnOx with [In3+]:[Zn2+] atomic ratio of 6:4 shows that the YInZnOx structure and the key TFT parameters can further be engineered and improved in terms of the on-to-off current modulation ratio and, most importantly, the field effect mobility. It is finally demonstrated that the latter is in excess of 52 cm(2) V-1 s(-1) by combining crystalline YInZnOx and spray-coated MgO dielectrics. These results identify spray-coated crystalline YInZnOx as a viable TFT semiconducting channel material with respect to enhanced electrical performance and processing requirements in terms of simplicity and cost.