3D structures for silicon carbide transistors utilising Al2O3 as a gate dielectric

Idris, M. Idzdihar; Horsfall, Alton B.

Abstract

This paper reports on the first investigation of the characteristics of 3D structures formed in silicon carbide for the realisation of ultra-high performance nanoscale transistors, based on the FINFET topology. Capacitance–voltage characteristics show evidence of a second flatband voltage, located at a higher bias than that seen for purely planar devices. Two distinct peaks in the conductance–voltage characteristics are observed, centred at the flatband voltages, where the amplitude of the high voltage peak correlates with the sidewall area. This suggests that the chemical behaviour of the sidewalls differ from those of the (0001) wafer surface. The breakdown electric field of the dielectric film grown on the 3D structure is in excess of 3 MV cm−1. It is demonstrated that 3D transistors (FINFETs) do not utilise the gate voltage range where the abnormal characteristics exist and so this work reports for the first time the possibility of high performance nanoscale transistors in silicon carbide that can operate at high temperatures.

Citation

Idris, M. I., & Horsfall, A. B. (2021). 3D structures for silicon carbide transistors utilising Al2O3 as a gate dielectric. Materials Science in Semiconductor Processing, 128, https://doi.org/10.1016/j.mssp.2021.105727

• Journal Article Type: Article
• Acceptance Date: Jan 22, 2021
• Online Publication Date: Feb 16, 2021
• Publication Date: 2021-06
• Deposit Date: Feb 19, 2021
• Publicly Available Date: Feb 16, 2023
• Journal: Materials Science in Semiconductor Processing
• Print ISSN: 1369-8001
• Electronic ISSN: 1873-4081
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 128
• DOI: https://doi.org/10.1016/j.mssp.2021.105727
• Public URL: https://durham-repository.worktribe.com/output/1280178