Precursor-route ZnO films from a mixed casting solvent for high performance aqueous electrolyte-gated transistors
Literature Information
Talal M. Althagafi, Saud A. Algarni, Abdullah Al Naim, Javed Mazher, Martin Grell
We significantly improved the performance of precursor-route semiconducting zinc oxide (ZnO) films in electrolyte-gated thin film transistors (TFTs). We find that the organic precursor to ZnO, zinc acetate (ZnAc), dissolves more readily in a 1 : 1 mixture of ethanol (EtOH) and acetone than in pure EtOH, pure acetone, or pure isopropanol. XPS and SEM characterisation show improved morphology of ZnO films converted from a mixed solvent cast ZnAc precursor compared to the EtOH cast precursor. When gated with a biocompatible electrolyte, phosphate buffered saline (PBS), ZnO thin film transistors (TFTs) derived from mixed solvent cast ZnAc give 4 times larger field effect current than similar films derived from ZnAc cast from pure EtOH. The sheet resistance at VG = VD = 1 V is 30 kΩ □−1, lower than for any organic TFT, and lower than for any electrolyte-gated ZnO TFT reported to date.
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