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Synthesis and characterization of photo-crosslinkable coumarin-containing polymer dielectric for organic transistors
摘要： Herein, a photo-crosslinkable coumarin-containing polymer, poly(7-(4-vinyl-benzyloxyl)-4-methylcoumarin) or PVBMC, was prepared, and its physicochemical and electrical properties as a gate dielectric in organic electronic devices, such as organic thin-film transistor (OTFT) and inverter, was evaluated. The crosslinking of PVBMC by exposure to UV light (365 nm) over time was characterized using Fourier-transform IR and UV-visible spectroscopy. The measured capacitance of the cross-linked PVBMC thin film in a metal-insulator-metal-type capacitor was as high as 36.4 pF/mm2. Pentacene-based OTFT and load-type inverter with the cross-linked PVBMC gate dielectric were prepared, and their electrical responses were evaluated under ambient conditions. The OTFT showed dominant hole charge carrier transport behavior with a field-effect mobility of 1.52 · 10-1 cm2/Vs and negligible hysteresis. The load-type inverter based on the OTFT exhibited moderate static and dynamic switching responses to the applied electrical pulse. These results suggest the potential application of photo-crosslinked PVBMC as a gate dielectric in the fabrication of high-performance OTFT-based devices.
关键词： Gate dielectric,Polymer film,Organic thin-film transistor,Photo-crosslinking
更新于2025-09-04 15:30:14
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Imide‐Functionalized Polymer Semiconductors
摘要： Imide-functionalized p-conjugated polymer semiconductors have received a great deal of interest owing to their unique physicochemical properties and optoelectronic characteristics, including excellent solubility, highly planar backbones, widely tunable band gaps and energy levels of frontier molecular orbitals, and good film morphology. The organic electronics community has witnessed rapid expansion of the materials library and remarkable improvement in device performance recently. This review summarizes the development of imide-functionalized polymer semiconductors as well as their device performance in organic thin-film transistors and polymer solar cells, mainly achieved in the past three years. The materials mainly cover naphthalene diimide, perylene diimide, and bithiophene imide, and other imide-based polymer semiconductors are also discussed. The perspective offers our insights for developing new imide-functionalized building blocks and polymer semiconductors with optimized optoelectronic properties. We hope that this review will generate more research interest in the community to realize further improved device performance by developing new imide-functionalized polymer semiconductors.
关键词： organic thin-film transistors,imide-functionalized polymers,organic semiconductors,solar cells
更新于2025-09-04 15:30:14
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Enhancement of the Electrical Performance of the Organic Ferroelectric Memory Transistor by Reducing the Surface Roughness of the Polymer Insulator with a Homo-Bilayer PVDF-TrFE
摘要： We suggest a feasible method to enhance the electrical performance of the organic nonvolatile memory transistor by reducing the surface roughness of the ferroelectric polymer insulator. A homo-bilayer of poly(vinylidene?uoride-co-tri?uoroethylene) [P(VDF-TrFE)] was used to control the high surface roughness of the conventional single layer [P(VDF-TrFE)] polymer insulator. The smoothening of the polymer insulator was achieved as the Z rms roughness was as low as 11.9 nm compared to the aboriginal single P(VDF-TrFE) ?lm of 18.8 nm. The homo-bilayer P(VDF-TrFE) thin ?lm transistor showed a higher memory on-off ratio (about 100) and mobility (2.9 × 10?2 cm2v?1s?1) compared with the native P(VDF-TrFE) with memory on-off ratio of 16 and mobility of 2.1 × 10?2 cm2v?1s?1. The underlying mechanism for the mobility enhancement which resulted in a high on-off ratio is mainly attributed to the reduction of the surface roughness of the ferroelectric polymer insulator.
关键词： Organic Thin Film Transistor,Ferroelectric,Homobilayer,P(VDF-TrFE)
更新于2025-09-04 15:30:14