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Khaya gum – a natural and eco-friendly biopolymer dielectric for low-cost organic field-effect transistors (OFETs)

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Abstract

Nature provides a wide range of dielectric biopolymers that can be used in electronic devices. In this work, organic field-effect transistors (OFETs) using khaya gum (KG), a natural, biodegradable biopolymer that can be directly collected from khaya senegalensis trees, as the gate dielectric are demonstrated. The fabricated bottom gate/top contact poly (3,6-di (2-thien-5-yl)-2,5-di (2-octyldodecyl)-pyrrolo [3,4-c] pyrrole-1,4-dione) thieno [3,2-b] thiophene) (DPPTTT) –(polymethylmethacrylate) (PMMA) OFETs operate at 3 V with a saturation field-effect mobility (μsat) 0.3 cm2V−1 s−1, threshold voltage (Vth) -1.3 V, subthreshold swing (SS) 450 mV/dec, and current on/off ratios (ION/OFF) larger than 3 × 103. Significantly, the gate leakage current (IG) does not exceed 10–8 A for the gate-source voltage (VGS) \(\le\)-3 V. UV–Vis spectra analysis shows that the prepared khaya gum films exhibit low absorbance and high transparency (up to 90%) with a calculated optical band gap of about 4.3 eV. Thermal characterization shows two stages of decomposition and a glass transition at around 60 °C. Characterization of metal–insulator-metal (MIM) capacitors using khaya gum reveals that the KG-based MIM capacitors possess a relatively high capacitance per unit area (Ci) of 130 ± 3 nF/cm2 at 1 kHz. As a result, khaya gum emerges as the dielectric of choice for low voltage, transparent OFETs where environmentally friendly device manufacturing is required.

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Acknowledgements

A. Tall and A. K. Diallo thank the CEA-MITIC (Centre d’Excellence Africainen Mathématiques, Informatique et TIC) for financial support. This work was funded by the Tunisian Ministry of Higher Education and Scientific Research and Senegalese Ministry of Higher Education, Research and Innovation through funds accorded to the implied research Labs.

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  1. Département de Physique Appliquée, UFR des Sciences Appliquées et de Technologie, Université Gaston Berger, BP. 234, Saint-Louis, Sénégal

    Abdoulaye Tall, Abdou K. Diallo & Mané Seck

  2. Department of Electrical and Electronic Engineering, University of Manchester, Sackville Street, Manchester, M13 9PL, UK

    Sheida Faraji, Navid Mohammadian & Leszek A. Majewski

  3. Laboratoire de Physique des Matériaux et des Nanomatériaux Appliqué à L’Environnement, Faculté des Sciences de Gabès, Université de Gabès, Cité Erridah, 6072, Gabès, Tunisie

    Mohsen Erouel, Meriem Saadi & Kamel Khirouni

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  1. Abdoulaye Tall
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Contributions

All authors contributed to the study conception, and design. Material characterizations were performed by AT and MS. OFETs fabrication and characterization were performed by SF, NM and LAM. AKD, ME, LAM and KK contributed to the results analysis. The first draft of the manuscript was written by AT and all authors corrected the previous versions of the manuscript. All authors read and approved this submitted version.

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Correspondence to Abdou K. Diallo, Kamel Khirouni or Leszek A. Majewski.

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Tall, A., Faraji, S., Diallo, A.K. et al. Khaya gum – a natural and eco-friendly biopolymer dielectric for low-cost organic field-effect transistors (OFETs). J Mater Sci: Mater Electron 33, 15283–15295 (2022). https://doi.org/10.1007/s10854-022-08388-2

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