High-Performance Thin-Film Transistors of Quaternary Indium-Zinc-Tin Oxide Films Grown by Atomic Layer Deposition

Title
High-Performance Thin-Film Transistors of Quaternary Indium-Zinc-Tin Oxide Films Grown by Atomic Layer Deposition
Authors
김성근편정준백인환Seong Ho HanGa-Yeon LeeByung Joon ChoiJeong Hwan HanTaek-Mo ChungCheol Seong Hwang
Keywords
atomic layer deposition; amorphous oxide; In-Zn-Sn-O; thin film transistor; vertical transistor
Issue Date
2019-04
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 11, NO 16-14901
Abstract
A new deposition technique is required to grow the active oxide semiconductor layer for emerging oxide electronics beyond the conventional sputtering technique. Atomic layer deposition (ALD) has the benefits of versatile composition control, low defect density in films, and conformal growth over a complex structure, which can hardly be obtained with sputtering. This study demonstrates the feasibility of growing amorphous In– Zn– Sn– O (a-IZTO) through ALD for oxide thin-film transistor (TFT) applications. In the ALD of the a-IZTO film, the growth behavior indicates that there exists a growth correlation between the precursor molecules and the film surface where the ALD reaction occurs. This provides a detailed understanding of the ALD process that is required for precise composition control. The a-IZTO film with In/Zn/Sn = 10:70:20 was chosen for high-performance TFTs, among other compositions, regarding the field-effect mobility (μFE), turn-on voltage (Von), and subthreshold swing (SS) voltage. The optimized TFT device with the a-IZTO film thickness of 8 nm revealed a high performance with a μFE of 22 cm2 V– 1 s– 1, Von of 0.8 V, and SS of 0.15 V dec– 1 after annealing at 400 °C for 30 min. Furthermore, an emerging device such as a vertical channel TFT was demonstrated. Thus, the a-IZTO ALD process could offer promising opportunities for a variety of emerging oxide electronics beyond planar TFTs.
URI
http://pubs.kist.re.kr/handle/201004/69318
ISSN
1944-8244
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KIST Publication > Article
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