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Channel Mobility and Contact Resistance in Scaled ZnO Thin-Film Transistors

Alnazer Mohamed, N.A. B. Ghazali, H.M. H. Chong, Richard Cobley Orcid Logo, Lijie Li Orcid Logo, Karol Kalna Orcid Logo

Solid-State Electronics, Volume: 172, Start page: 107867

Swansea University Authors: Alnazer Mohamed, Richard Cobley Orcid Logo, Lijie Li Orcid Logo, Karol Kalna Orcid Logo

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Abstract

ZnO thin-film transistors (TFTs) with scaled channel lengths of 10 m, 5 m, 4 m, and 2 m exhibit increasing intrinsic channel electron mobility at a gate bias of 10 V (15 V) from 0.782 cm/Vs (0.83 cm/Vs) in the 10 m channel length TFT to 8.9 cm/Vs (19.04 cm/Vs) for the channel length scaled down to 2...

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Published in: Solid-State Electronics
ISSN: 0038-1101
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa54909
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Abstract: ZnO thin-film transistors (TFTs) with scaled channel lengths of 10 m, 5 m, 4 m, and 2 m exhibit increasing intrinsic channel electron mobility at a gate bias of 10 V (15 V) from 0.782 cm/Vs (0.83 cm/Vs) in the 10 m channel length TFT to 8.9 cm/Vs (19.04 cm/Vs) for the channel length scaled down to 2 m. Current-voltage measurements indicate an n-type channel enhancement mode transistor operation, with threshold voltages in the range of V to V, maximum drain currents of 41 A/m, 96 A/m, 193 A/m, and 214 A/m at a gate bias of 10 V, and breakdown voltages of 80 V, 70 V, 62 V, and 59 V with respect to channel lengths of 10 m, 5 m, 4 m, and 2 m. The channel electron mobility (excluding contact resistance) is extracted by the transmission line method (TLM) from the effective electron mobility (including contact resistance). The contact sheet resistance of /sq extracted from the measurements, which is larger than the contact sheet resistance of /sq obtained from the DFT calculation and the 1D self-consistent Poisson-Shrödinger simulation, largely limits the drive current in the scaled ZnO TFTs.
Keywords: Thin-Film Transistors, Transmission Line Method, Remote Plasma Atomic Layer Deposition, Density Functional Theory
College: College of Engineering
Start Page: 107867