Modulating Cationic Ratios for High-Performance Transparent Solution-Processed Electronics

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• 作者：Rohit Abraham John ; Anh Chien Nguyen ; Yuxin Chen ; Sudhanshu Shukla ; Shi Chen ; Nripan Mathews
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：January 20, 2016
• 年：2016
• 卷：8
• 期：2
• 页码：1139-1146
• 全文大小：489K
• ISSN：1944-8252

文摘

Amorphous oxide semiconductors such as indium zinc tin oxide (IZTO) are considered favorites to serve as channel materials for thin film transistors (TFTs) because they combine high charge carrier mobility with high optical transmittance, allowing for the development of transparent electronics. Although the influence of relative cationic concentrations in determining the electronic properties have been studied in sputtered and PLD films, the development of printed transparent electronics hinges on such dependencies being explored for solution-processed systems. Here, we study solution-processed indium zinc tin oxide thin film transistors (TFTs) to investigate variation in their electrical properties with change in cationic composition. Charge transport mobility ranging from 0.3 to 20.3 cmp>2p>/(V s), subthreshold swing ranging from 1.2 to 8.4 V/dec, threshold voltage ranging from ?50 to 5 V, and drain current on–off ratio ranging from 3 to 6 orders of magnitude were obtained by examining different compositions of the semiconductor films. Mobility was found to increase with the incorporation of large cations such as Inp>3+p> and Snp>4+p> due to the vast s-orbital overlap they can achieve when compared to the intercationic distance. Subthreshold swing decreased with an increase in Znp>2+p> concentration due to reduced interfacial state formation between the semiconductor and dielectric. The optimized transistor obtained at a compositional ratio of In/Zn/Sn = 1:1:1, exhibited a high field-effect mobility of 8.62 cmp>2p>/(V s), subthreshold swing of 1.75 V/dec, and current on–off ratio of 10p>6p>. Such impressive performances reaffirm the promise of amorphous metal oxide semiconductors for printed electronics.