Solution-processable and photopolymerisable TiO2 nanorods as dielectric layers for thin film transistors

Fei Cheng; Emanuele Verrelli; Fahad A. Alharthi; Satyajit Das; Thomas D. Anthopoulos; Khue T. Lai; Neil T. Kemp; Mary O'Neill; Stephen M. Kelly

doi:10.1039/D0RA04445H

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Solution-processable and photopolymerisable TiO₂ nanorods as dielectric layers for thin film transistors†

Fei Cheng,^a Emanuele Verrelli,^b Fahad A. Alharthi,

^ac Satyajit Das,^d Thomas D. Anthopoulos,

^de Khue T. Lai,^f Neil T. Kemp,

^b Mary O'Neill

^g and Stephen M. Kelly

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry & Biochemistry, University of Hull, Cottingham Road, Hull, UK
E-mail: s.m.kelly@hull.ac.uk

^b Department of Physics & Mathematics, University of Hull, Cottingham Road, Hull, UK

^c Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia

^d Centre for Plastic Electronics, Department of Physics, Blackett Laboratory, Imperial College London, London SW7 2BW, UK

^e King Abdullah University of Science and Technology (KAUST), KAUST Solar Centre, Thuwal 23955-6900, Saudi Arabia

^f Electronic Systems Design Centre, Energy Safety Research Institute, College of Engineering, Swansea University Bay Campus, Swansea, UK

^g School of Science & Technology, Nottingham Trent University, 50 Shakespeare Street, Nottingham, UK

Abstract

We report the fabrication of a solution-processed n-type Thin Film Transistor (TFT) with current on/off ratios of 10⁴, a turn-on voltage (V_ON) of 1.2 V and a threshold voltage (V_T) of 6.2 V. The TFT incorporates an insoluble and intractable dielectric layer (k = 7–9) prepared in situ from solution-processed and then photopolymerised ligand-stabilised, inorganic/organic TiO₂ nanorods. A solution processed zinc oxide (ZnO) layer acts as the semiconductor. The new surface-modified TiO₂ nanorods were synthesised using a ligand replacement process with a monolayer coating of photopolymerisable 10-undecynylphosphonic acid (10UCYPA) to render them both soluble in common organic solvents and be photopolymerisable using UV-illumination after having been deposited on substrate surfaces from solution and drying.

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Article information

DOI: https://doi.org/10.1039/D0RA04445H
Article type: Paper
Submitted: 19 May 2020
Accepted: 23 Jun 2020
First published: 06 Jul 2020
This article is Open Access

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RSC Adv., 2020,10, 25540-25546

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Solution-processable and photopolymerisable TiO₂ nanorods as dielectric layers for thin film transistors

F. Cheng, E. Verrelli, F. A. Alharthi, S. Das, T. D. Anthopoulos, K. T. Lai, N. T. Kemp, M. O'Neill and S. M. Kelly, RSC Adv., 2020, 10, 25540 DOI: 10.1039/D0RA04445H

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