Research On The Performance Of Organic Arrays Micro-nano And Optoelectronic Devices Based On Super Wetting Interface

Preparing micro-nano structure arrays with long-range order and controllable size through the control of spatial distribution and geometry is important for their applications of optoelectronic devices,which could be modulated by using the special infiltrating surface-induced liquid dewetting process.For solution-processable materials,its patterning technique is limited by the uncontrollable liquid transport on the surface.Based on this background,we selectively modify the surface of micropillar-structured silicon template,thus regulating the dewetting process of the liquid and controlling the formation of capillary bridges to realize the regulation of the growth direction and nucleation sites of organic materials towards long-range ordered nanostructure arrays.We apply this method to the research of patterning organic materials and optoelectronic devices.The main research contents are as follows:(1)A neatly arranged silicon pillar template is designed.By modifying the surface of the silicon micropillars,the super-hydrophobic state state was achieved.When the liquid pinned on the surface of silicon micropillars,stable capillary bridges were formed between adjacent silicon pillars.The dewetting process can be observed through fluorescence microscope.Small molecules,polymers,and nanoparticles dispersing in the liquid self-assemble as the liquid bridge shrinks which further guide one-dimensional micro/nanostructure formation.(2)Based on the capillary-bridge-mediated assembly method,we design silicon template with programmable patterns to realize the formation of the horizontal liquid bridge and vertical liquid bridge array further to achieve the fabrication of long-range ordered micro/nanostructure patterns by controlling the dewetting process.Based on this method,we prepared organic polymer semiconductor arrays and transfer them onto the flexible substrate and investigated the stretchability of as-prepared flexible polymer arrays under different stretching conditions.(3)Based on the solution processability of organic semiconductors and organic materials,we used the capillary-bridge-mediated method to realize the preparation of well aligned field effect transistors arrays.Compared with the thin film of organic semiconductor,the surface of the micro-nano array is smooth,and the molecules are formed orderly,so the mobility of the prepared device is higher.(4)Based on organic semiconductor materials that cannot be processed in the liquid phase,low-roughness alumina and hafnium oxide dielectric layers were prepared,and after the chemical modification of the dielectric layer surface,the performance of organic field effect transistor devices under different conditions was studied,We found that the low-roughness dielectric layer has a significantly improved switching ratio and carrier mobility compared to the OFET device made of the surface-treated dielectric layer.Among them,low-roughness alumina and hafnium oxide are used as the dielectric The OFET device switching ratio of the layer exceeds 10~7.