Threshold voltage tuning in gelatin biopolymer-gated high-performance organic field-effect transistors
Synthetic Metals(2023)
摘要
Natural biopolymers have been of considerable interest in developing flexible, biocompatible and biodegradable organic electronic devices. Herein, we demonstrate gelatin biopolymer gated OFETs utilizing thermally evaporated α-sexithiophene (α-6T) and solution-processable poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT-C14) as organic semiconductors (OS). The tunability of threshold voltage (VT) for the OFETs as a function of lithium-perchlorate (LP) content (% w/w) in gelatin is also explored. With the increase of LP (0% to 20% w/w) in the gelatin, VT reduces from − 5.7 V to − 1.75 V and − 2.15 V to + 0.1 V for α-6T and PBTTT-C14 based OFETs, respectively. The highest hole mobility in the saturation regime (μS) of α-6T and PBTTT-C14 is estimated as 2.0 cm2V−1s−1 and 0.1 cm2V−1s−1 respectively with the on/off ratio ∼103. It is ascribed to the efficient formation of an electric double layer (EDL) at the dielectric/organic interface. The reduction in the VT upon LP incorporation can be attributed to the additional ionic contribution of ClO4- to the EDL along with the trap density (NT) reduction at dielectric/OS interface.
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关键词
Gelatin,Biopolymer,Lithium-perchlorate,α-6T,PBTTT-C14,Electric double layer (EDL),Threshold voltage
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