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

Tall, Abdoulaye; Faraji, Sheida; Diallo, Abdou Karim; Mohammadian, Navid; Erouel, Mohsen; Seck, Mamadou; Saadi, Meriem; Khirouni, K.; Majewski, Leszek A.

doi:10.1007/s10854-022-08388-2

Cited by 9 publications

(4 citation statements)

References 58 publications

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“…The observed small positive shift of the threshold voltage (|ΔV th | = 0.2 V) is likely due to an increased fraction of deeply trapped charge carriers that no longer contribute to charge transport (Simatos et al, 2021). Intriguingly, it appears that DPPTTT:PMMA OFETs using cashew gum as the gate insulator are more electrically stable than the organic transistors using khaya gum (Tall et al, 2022). However, BS in OFETs is still not well understood and it remains unclear what exactly causes this phenomenon in devices.…”

Section: Evaluation Of Ofet Bias Stressmentioning

confidence: 98%

“…Regarding biopolymer dielectrics, electric insulators of plant origin have lately attracted increased attention of material and device engineers because they can be readily processed into thin films from aqueous solutions in ambient conditions and generally display good dielectric properties. Indeed, several examples of lowvoltage operating OFETs using a wide range of plant-and tree-based materials as the gate insulator including almond, arabic, and khaya gums, have just been reported (Ivić et al, 2022;D'Orsi et al, 2022;Seck et al, 2020a;Seck et al, 2020b;Tall et al, 2022). Here, organic field-effect transistors using an alternative gum, i.e., cashew gum (CG), that operate with |V G | ≤ 3 V are demonstrated.…”

Section: Introductionmentioning

confidence: 95%

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Towards sustainable, solution-processed organic field-effect transistors using cashew gum as the gate dielectric

Faraji,

Tall,

Mohammadian

et al. 2023

Front. Mater.

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To realize low-cost, environmentally friendly electronic devices and circuits, there is currently a strong trend to explore plant-based dielectric materials because they can be responsibly sourced from agricultural or forest vegetation, are generally water-soluble, and possess good electrical insulator properties. In this contribution, organic field-effect transistors (OFETs) using a biopolymer dielectric obtained from exudates of Anacardium occidentale Linn. trees, namely, cashew gum (CG), are reported. To characterise the physical and dielectric properties of the gum, thin films and metal-insulator-metal (MIM) capacitors were prepared and characterized. To evaluate the material’s performance in OFETs, bottom-gate top-contact (BGTC) p-channel 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]:polymethyl methacrylate (DPPTTT:PMMA) transistors were engineered and studied. The fabricated MIM capacitors display a comparatively high areal capacitance of 260 nF/cm2 at 1 kHz for 130 nm thick films. As a result, the solution-processed DPPTTT:PMMA OFETs favourably operate at 3 V with the average saturation field-effect mobility equal to 0.20 cm2/Vs., threshold voltage around −1.4 V, subthreshold swing in the region of 250 mV/dec, and ON/OFF current ratio well above 103. As such, cashew gum emerges as a promising dielectric for sustainable manufacturing of solution-processed organic FETs.

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Section: Evaluation Of Ofet Bias Stressmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 95%

Towards sustainable, solution-processed organic field-effect transistors using cashew gum as the gate dielectric

Faraji,

Tall,

Mohammadian

et al. 2023

Front. Mater.

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“…The evolution of relaxation time with temperature obeys Arrhenius law τ r ¼ τ 0 :e À Ea K B T (10) where τ 0 is the pre-exponential factor, E a is the activation energy of relaxation and K B is the Boltzmann constant.…”

Section: Complex Impedance Analysismentioning

confidence: 99%

“…1 Several biopolymer materials derived from gums, constituted of plan secretions, have demonstrated to well work as gate insulator in organic field effect transistors (OFET). 3 Among these exudate gums, we can cite gum arabic, 7 gum ghatti, gum tragacanth, almond gum 8,9 and gum khaya 10 which share their natural abundance, their low cost and their low toxicity. In addition, gums are largely attractive for application thanks to their ability to be easily transformed into films with lower cost aqueous solvents such as deionized water and ethyl alcohol.…”

Section: Introductionmentioning

confidence: 99%

Structural and electrical properties of cashew gum thin film deposited by spray pyrolysis

Erouel

Saadi

Tall

et al. 2023

Polymers from Renewable Resources

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Biopolymers obtained from renewable resources became the center of public interest by virtue of their environmental and commercial advantages. Natural polymers such as starch, almond gum, chitosan and arabic gum were investigated to get fully or partially biodegradable dielectric material. Thus, in this article we study the material properties of cashew gum. This biopolymer is an exudate collected from occidental anacardium tree. For this investigation, scanning electron microscopy of powder and thin film cashew gum showed homogenous and slightly rough surface morphology with visible wrinkles. The thermal analyses such as thermogravimetric (TGA) and differential scanning calorimeter were realized. thermogravimetric thermogram shows two distinct stages of decomposition. The first around 150°C is attributed to moisture evaporation with loss in weight of 9.7%. The second transition, between 255°C and 330°C, is related to the decomposition of cashew gum with loss in weight of 50%. UV-visible spectra of the cashew gum thin film show a low absorbance and high transmittance. For this material, we obtained a direct optical band gap around 4.56 eV. In addition, the dielectric and electrical characterizations lead to conclude that cashew gum may be interesting for transistor applications as a gate dielectric.

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Green Electrochemical Point‐of‐Care Devices: Transient Materials and Sustainable Fabrication Methods

Batet,

Gabriel

2024

ChemSusChem

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The spread of point‐of‐care (PoC) diagnostic tests using electrochemical sensors poses a significant environmental challenge, especially in limited‐resource settings due to the lack of waste management infrastructure. This issue is expected to intensify with the emergence of the Internet of Medical Things (IoMT), necessitating eco‐friendly solutions for disposable devices. This review discusses efforts to develop green and sustainable PoC diagnostic devices, clarifying terms like biodegradability and transient electronics. It explores potential transient and biodegradable materials and fabrication technologies, emphasizing sustainable electronics with low‐energy consumption and low‐carbon footprint techniques, particularly favoring printing methods. The review highlights examples of necessary electronic components containing biodegradable materials for electrochemical PoC devices and discusses their role in device sustainability. Finally, it examines the feasibility of integrating these components and technologies into comprehensive biodegradable PoC devices, addressing the imminent need for eco‐friendly solutions in diagnostic testing. This comprehensive discussion serves as a guide for researchers and developers striving to mitigate the environmental impact of PoC testing in the era of IoMT and personalized medicine.

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

Cited by 9 publications

References 58 publications

Towards sustainable, solution-processed organic field-effect transistors using cashew gum as the gate dielectric

Towards sustainable, solution-processed organic field-effect transistors using cashew gum as the gate dielectric

Structural and electrical properties of cashew gum thin film deposited by spray pyrolysis

Green Electrochemical Point‐of‐Care Devices: Transient Materials and Sustainable Fabrication Methods

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