Corrugated Heterojunction Metal-Oxide Thin-Film Transistors with High Electron Mobility via Vertical Interface Manipulation
- Authors
- Lee, Minuk; Jo, Jeong-Wan; Kim, Yoon-Jeong; Choi, Seungbeom; Kwon, Sung Min; Jeon, Seong Pil; Facchetti, Antonio; Kim, Yong-Hoon; Park, Sung Kyu
- Issue Date
- Oct-2018
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- corrugated structures; heterointerfaces; metal-oxide thin-film transistors; solution processes; TCAD simulations
- Citation
- ADVANCED MATERIALS, v.30, no.40
- Journal Title
- ADVANCED MATERIALS
- Volume
- 30
- Number
- 40
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/668
- DOI
- 10.1002/adma.201804120
- ISSN
- 0935-9648
1521-4095
- Abstract
- A new strategy is reported to achieve high-mobility, low-off-current, and operationally stable solution-processable metal-oxide thin-film transistors (TFTs) using a corrugated heterojunction channel structure. The corrugated heterojunction channel, having alternating thin-indium-tin-zinc-oxide (ITZO)/indium-gallium-zinc-oxide (IGZO) and thick-ITZO/IGZO film regions, enables the accumulated electron concentration to be tuned in the TFT off- and on-states via charge modulation at the vertical regions of the heterojunction. The ITZO/IGZO TFTs with optimized corrugated structure exhibit a maximum field-effect mobility >50 cm(2) V-1 s(-1) with an on/off current ratio of >10(8) and good operational stability (threshold voltage shift <1 V for a positive-gate-bias stress of 10 ks, without passivation). To exploit the underlying conduction mechanism of the corrugated heterojunction TFTs, a physical model is implemented by using a variety of chemical, structural, and electrical characterization tools and Technology Computer-Aided Design simulations. The physical model reveals that efficient charge manipulation is possible via the corrugated structure, by inducing an extremely high carrier concentration at the nanoscale vertical channel regions, enabling low off-currents and high on-currents depending on the applied gate bias.
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Collections - College of ICT Engineering > School of Electrical and Electronics Engineering > 1. Journal Articles
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