Organic FETs using biodegradable almond gum as gate dielectric: A promising way towards green electronics

Mané Seck, Navid Mohammadian, Abdou K. Diallo, Sheida Faraji, Mohsen Erouel, Noureddine Bouguila, Diène Ndiaye, Kamel Khirouni, Leszek A. Majewski

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Abstract

Green electronics is an emerging field of research which aims to manufacture devices in an environmentally friendly and sustainable way. Usually, the involved electronic materials are naturally occurring and non-toxic. Also, they can be processed using simple, low energy deposition processes and fabrication techniques. In this work, we present low voltage organic field-effect transistors (OFETs) using almond gum (AG) as the gate dielectric. AG is a natural, biodegradable insulator material that can be directly collected from almond trees and used without any further purification. Moreover, AG possesses interesting properties such as water solubility, ease of processing, good insulation, low leakage current, good film quality, and high capacitance making it a promising dielectric for OFET devices. Bottom gate/bottom contact p-channel OFETs have been processed on glass substrates with 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) polymethyl methacrylate (PMMA) blend as the active layer and gold as the source and drain electrodes. The transistors operate at low voltage (VGS ≤ 3 V), with threshold voltages Vth as low as −0.8 V, saturated field effect mobilities μsat above 0.75 cm2 V−1 s−1, subthreshold swings SS around 270 mV/dec and ON/OFF current ratio equal to 103. The combined favourable properties of both almond gum and low voltage operated OFET devices have a high potential to pave a way towards using naturally occurring, biodegradable electronic materials in future disposable sensors or throwaway, low-end electronics.
Original languageEnglish
Pages (from-to)105735
JournalOrganic Electronics: physics, materials, applications
Volume83
Early online date28 Mar 2020
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Green electronics
  • almond gum
  • dielectric
  • low voltage organic transistors (OFETs)

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