Thienothiophene and benzothiadiazole based conjugated donor-acceptor polymers; synthesis, photophysical properties and organic field effect transistor applications

IF 2.7 4区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Organic Electronics Pub Date : 2024-10-06 DOI:10.1016/j.orgel.2024.107147

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引用次数: 0

Abstract

Novel conjugated donor-acceptor (D-A) type polymers (P1-P3) possessing thieno[3,2-b]thiophenes (TT) as donors having different functional groups and 2,1,3-benzothiadiazole (BT) as an acceptor were designed and synthesized via palladium-catalyzed Sonogashira coupling reaction. Their electronic and optical properties were investigated by UV–Vis and fluorescence spectroscopies and cylic voltammetry analysis. Organic field-effect transistor (OFET) of the polymers were fabricated using biodegradable and environmental-friendly khaya gum as a high dielectric layer to investigate their charge transport characteristics were at low voltage. All the polymers displayed a p-type field-effect behaviour, among which alkyl chain (C₉H₁₉) substituted P2 exhibited the highest average saturated hole mobility, μ_sat, 0.086 cm² V⁻¹ s⁻¹, on/off current ratio, I_on/I_off = 1.0 × 10³, and subthreshold swing, SS, 425 mV dec⁻¹. The results presented in this work corroborate that the three novel TT-BT polymers have promising potential for electronic and optoelectronic applications, in particular, where tunability of the field-effect behaviour is essential for performance.

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基于噻吩和苯并噻二唑的共轭供体-受体聚合物；合成、光物理性质和有机场效应晶体管应用

通过钯催化的 Sonogashira 偶联反应，设计并合成了以具有不同官能团的噻吩并[3,2-b]噻吩（TT）为给体、2,1,3-苯并噻二唑（BT）为受体的新型共轭给体-受体（D-A）型聚合物（P1-P3）。研究人员通过紫外可见光谱、荧光光谱和环形伏安分析法研究了它们的电子和光学特性。使用可生物降解的环保型卡亚胶作为高介电层，制作了这些聚合物的有机场效应晶体管（OFET），以研究它们在低电压下的电荷传输特性。所有聚合物都显示出 p 型场效应行为，其中烷基链（C9H19）取代的 P2 显示出最高的平均饱和空穴迁移率（μsat，0.086 cm2 V-1 s-1）、开/关电流比（Ion/Ioff = 1.0 × 103）和阈下摆动（SS，425 mV dec-1）。这项研究的结果证实，这三种新型 TT-BT 聚合物在电子和光电应用中具有广阔的发展前景，特别是在场效应行为的可调谐性对性能至关重要的应用领域。

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来源期刊

Organic Electronics 工程技术-材料科学：综合

CiteScore

6.60

自引率

6.20%

发文量

238

审稿时长

44 days

期刊介绍： Organic Electronics is a journal whose primary interdisciplinary focus is on materials and phenomena related to organic devices such as light emitting diodes, thin film transistors, photovoltaic cells, sensors, memories, etc. Papers suitable for publication in this journal cover such topics as photoconductive and electronic properties of organic materials, thin film structures and characterization in the context of organic devices, charge and exciton transport, organic electronic and optoelectronic devices.