Guiding charge injection in Schottky-barrier transistors through the spatial Fermi-level gradients of heterogeneous bimetallic systems
- Authors
- Kim, Min-Joong; Kim, Woo-Seok; Kim, Chang-Hyun; Kwon, Jin-Hyuk; Kim, Min-Hoi
- Issue Date
- Sep-2023
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.11, no.37, pp 12675 - 12684
- Pages
- 10
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 11
- Number
- 37
- Start Page
- 12675
- End Page
- 12684
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89350
- DOI
- 10.1039/D3TC02561F
- ISSN
- 2050-7526
2050-7534
- Abstract
- A heterogeneous bimetallic system (HBS), composed of two metallic thin films with inherently different Fermi levels, is potentially usable for the fine tuning of interfacial charge dynamics. Here, we propose a viable methodology for adjusting the turn-on voltage (Vto) of Schottky-barrier TFTs (SB-TFTs) based on new insights into the utilization of the physical properties of metallic materials. HBS-based thin films are demonstrated to provide a designable workfunction at a structural level. The acquired spatial gradients of the Fermi level, formed in the HBS, are considered a critical factor for achieving the structurally designable workfunction. During device testing, a significant correlation is observed between the Vto of SB-TFTs and the workfunction of their HBS-based source-drain (SD) electrodes. The ability to tailor the Vto property through the HBS strategy is attributed to the variation in workfunction of the HBS-based SD electrodes, which modulates the charge injection across the Schottky barrier. The Vto variation is extensively investigated by exploring various structural aspects of the HBS-based SD electrodes. Lastly, the HBS strategy enables clear off-states in both n-type and p-type SB-TFTs and their balanced electrical performances, through which a complementary inverter is successfully demonstrated. A heterogeneous bimetallic system, composed of two metallic thin films with inherently different Fermi levels, is potentially usable for the fine tuning of interfacial charge dynamics.
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