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>Li-Assisted Low-Temperature Phase Transitions in Solution-Processed Indium Oxide Films for High-Performance Thin Film Transistor
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Li-Assisted Low-Temperature Phase Transitions in Solution-Processed Indium Oxide Films for High-Performance Thin Film Transistor
Lithium (Li)-assisted indium oxide (In2O3) thin films with ordered structures were prepared on solution-processed zirconium oxide (ZrO2) gate dielectrics by spin-casting and thermally annealing hydrated indium nitrate solutions with different Li nitrate loadings. It was found that the Li-assisted In precursor films on ZrO2 dielectrics could form crystalline structures even at processing temperatures (T) below 200 °C. Different In oxidation states were observed in the Li-doped films, and the development of such states was significantly affected by both temperature and the mol% of Li cations, [Li+]/([In3+] + [Li+]), in the precursor solutions. Upon annealing the Li-assisted precursor films below 200 °C, metastable indium hydroxide and/or indium oxyhydroxide phases were formed. These phases were subsequently transformed into crystalline In2O3 nanostructures after thermal dehydration and oxidation. Finally, an In2O3 film doped with 13.5 mol% Li+ and annealed at 250 °C for 1 h exhibited the highest electron mobility of 60 cm2 V−1 s−1 and an on/off current ratio above 108 when utilized in a thin film transistor.
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机译:通过旋转浇铸和热退火不同硝酸硝酸锂负载量的水合硝酸铟溶液,在固溶处理的氧化锆(ZrO2)栅极电介质上制备了有序结构的锂(Li)辅助氧化铟(In2O3)薄膜。结果发现,即使在低于200 processingC的加工温度(T)下,ZrO2电介质上的Li辅助In前驱体膜也可以形成晶体结构。在掺杂锂的薄膜中观察到不同的In氧化态,并且温度和Li阳离子的摩尔百分比[ Li em> + sup> ] /([[ In em> 3 em> + sup>] + [ Li em> + sup>]),在前体溶液中。在低于200 C的条件下对 Li em>辅助的前体薄膜进行退火后,形成了亚稳态的氢氧化铟和/或羟基氧化铟相。经过热脱水和氧化后,这些相随后转变为晶体 In em> 2 em> O em> 3 em>纳米结构。最后,掺杂了13.5 mol% Li em> em> In em> 2 em> O em> 3 em>薄膜sup> + sup>并在250 C退火1 h表现出最高电子迁移率60 cm 2 sup> V -1 sup> s -1 sup>和在薄膜晶体管中使用时的开/关电流比大于10 8 sup>。
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