Electrically stable, solution-processed amorphous oxide IZO thin-film transistors through a UV-ozone assisted sol-gel approach

Thokchom Birendra Singh, Jacek Jaroslaw Jasieniak, Leonardo de Oliveira Tozi, Christopher David Easton, Mark Bown

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12 Citations (Scopus)


Metal acetylacetonates are conventional sol-gel precursors used to deposit thin amorphous metal oxide films of In-Zn-O (IZO) suitable for thin-film field effect transistors (TFTs). In this paper, we couple this traditional approach with a postdeposition UV-ozone treatment to effectively reduce carbon impurities prior to any thermal treatment steps. Therefore, we find that the rate of bulk metal oxide formation is enhanced, thus enabling a significant reduction of the processing temperature necessary to achieve high-mobility transistors. Optimized TFT structures processed at 300?C show n-type mobility of 35 cm 2/Vs with on and off ratio of 107. Moreover, positive bias stress tests of such devices are found to exhibit one the lowest threshold voltage shifts of any solution-processed amorphous TFT fabricated without a passivation layer.
Original languageEnglish
Pages (from-to)1093-1100
Number of pages8
JournalIEEE Transactions on Electron Devices
Issue number4
Publication statusPublished - Apr 2014
Externally publishedYes

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