In this paper, a transistor with Si as the substrate, SiO2 as the dielectric layer, and Pentacene as the organic layer, and Au as the source-drain electrode was designed and prepared, and the dielectric layer was optimized by spin-coating a layer of PMMA. Subsequently, the transistors pre and post optimization were characterized by Raman detection, white light interferometric detection, XRD and other characterization tests, which verified that the optimized Pentacene film has better properties. Finally, electrical measurements of the two devices were carried out using an electrochemical platform. The output versus transfer characteristic curves derived from the tests confirmed that the PMMA-optimized parallel Pentacene thin-film transistors had enhanced mobility, boost significantly lower threshold voltage, and reformed device performance.
Laser direct writing technology was a convenient and efficient method in micromachining, which was widely used in polymer processing. In this paper, two kinds of excimer laser (193 nm and 248 nm) were used to irradiate vertically the surface of polydimethylsiloxane (PDMS) for ablation experiments. The experiments were carried out in atmospheric environment, and the ablated samples were characterized by optical microscope, laser confocal microscope, white light interferometer, scanning electron microscope, etc. to obtain their morphology. Analysis was performed on the effects of laser energy and pulse numbers on depth, roughness, and morphology. The outcomes demonstrated that, the crater depth and roughness increased as the number of pulses and energy increased, but that the bottom surface's roughness did not continuously increased with the ablation of a 248 nm laser. At low energy, the roughness remained constant as the number of pulses increased. When the laser operating voltage was adjusted to 23 kV, the roughness increased linearly with the number of pulses. As the laser energy and the number of pulses increased, the number of splashes deposited on the ablation surface increased. Cracks were generally observed across the PDMS surface after a 248 nm laser and the crater edges were rough. The morphology in the 193nm laser ablation showed better micromachining quality, reflected in a small number of pores, sharp edges, and smoother bottom surface.
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