Cation Composition-Dependent Device Performance and Positive Bias Instability of Self-Aligned Oxide Semiconductor Thin-Film Transistors: Including Oxygen and Hydrogen Effect
- Authors
- Jang, Jun Tae; Kim, Donguk; Baeck, Ju Heyuck; Bae, Jong Uk; Noh, Jiyong; Lee, Seok-Woo; Park, Kwon-Shik; Kim, Jeom Jae; Yoon, Soo Young; Kim, Changwook; Kim, Yong-Sung; Oh, Saeroonter; Kim, Dae Hwan
- Issue Date
- Jan-2022
- Publisher
- American Chemical Society
- Keywords
- oxide semiconductors; thin-film transistors; cation composition; oxygen and hydrogen effect; positive bias stress instability
- Citation
- ACS Applied Materials & Interfaces, v.14, no.1, pp 1 - 8
- Pages
- 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Materials & Interfaces
- Volume
- 14
- Number
- 1
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/108018
- DOI
- 10.1021/acsami.1c18890
- ISSN
- 1944-8244
1944-8252
- Abstract
- Amorphous oxide semiconductor transistors control the illuminance of pixels in an ecosystem of displays from large-screen TVs to wearable devices. To satisfy application-specific requirements, oxide semiconductor transistors of various cation compositions have been explored. However, a comprehensive study has not been carried out where the influence of cation composition, oxygen, and hydrogen on device characteristics and stability is systematically quantified, using commercial-grade process technology. In this study, we fabricate self-aligned top-gate structure thin-film transistors with three oxide semiconductor materials, InGaZnO (In/Ga/Zn = 1:1:1), In-rich InGaZnO, and InZnO, having mobility values of 10, 27, and 40 cm(2) /V.s, respectively. Combinations of varied amounts of oxygen and hydrogen are incorporated into each transistor by controlling the fabrication process to study the effect of these gaseous elements on the physical nature of the channel material. Electrons can be captured by peroxy linkage (O-2(2-)) or undercoordinated In (In* to become In+), which are manifested in the extracted subgap density-of-states profile and first-principles calculations. Energy difference between electron-trapped In+ and O-2(2-) sigma* is the smallest for IGZO, and In+-O-2(2-) annihilation occurs by electron excitation from the subgap In+ state to the O-2(2-) sigma*. Furthermore, characteristic time constants during positive bias stress and recovery reveal the various microscopic physical phenomena within the transistor structure between different cation compositions.
- Files in This Item
-
Go to Link
- Appears in
Collections - COLLEGE OF ENGINEERING SCIENCES > SCHOOL OF ELECTRICAL ENGINEERING > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/108018)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.