| 摘要: | 現今人類生活大量依靠電子產品，而無機材料特別以矽主體之積體電路研究漸達飽合，以有機 高分子/小分子材料製備有機電子對未來發展極為關鍵。由於其具備可低溫製程、印刷性、低成本、 大面積製作等優勢，若能開發高性能、可靠性及環境穩定度等電子產品，發展市場潛力將可提昇。 電晶體為現代電子技術基石，因此開發新穎有機半導體材料及應用於有機電晶體和相關元件深 具意義。然而目前仍遇到三大挑戰：溶液製程操作、薄膜形貌調控及元件效能增進。因此本計劃以 可溶性有機高分子半導體混摻調控電晶體效能，混摻物理與薄膜形貌及溶液製程最適化條件和元件 物理作探討。 三年研究計晝如下所述： (1)有機高分子及小分子半導體開發。 (2)溶液製程(旋轉塗佈、溶液剪切法、超音波喷塗)製備有機高分子混摻半導體薄膜(有機半導體/絕緣 高分子混摻、有機半導體間混摻(P型與N型小分子半導體、小分子與高分子半導體))並應用於電 晶體。 (3)環境穩定且柔軟高分子混摻半導體薄膜應用於軟性電子。 (4)溶液製程頂電極於全溶液製程有機混摻薄膜電晶體 (5)以有機半導體混摻製作互補式反相器。 (6)建立有機高分子半導體混摻材料中化學結構、溶液製程參數、高分子混摻與薄膜形態、半導體分 子排列、元件效能關係。 ;Progress in technologies that address the constantly evolving demands of consumers, driven by the development of new materials and processing techniques, have opened the door to an array of new opportunities. Organic electronic can meet very diverse consumer needs due to their synthetic versatility and processing flexibility. Organic-based devices have been achieved with the development of new semiconducting materials which provide competing multifunctionalities relative to inorganic counterpart. However, as it happens with all types of technologies, the following three main challenges are pointed out as potential roadblocks: solution-processing method, controllable thin film morphologies, and device performance. Currently there is a significant increasing interest in optimizing or developing to meet those requirements. Here, we will focus on the less well-exploited but equally interesting use in thin film based organic field effect transistor (OFET) where organic semiconductor layer can be replaced by organic polymer semiconducting blends. Solution-processing allows the simple fabrication of blend films and is compatible with large scale, and potentially low cost, technologies. The blend phase separates into a layered phase domain geometry that confines charge into semiconducting channel, laterally positioned between the source and drain. As a result, the size, shape, distribution, percolation, and orientation of the semiconductors phase domain determine the principle mode of electrical operation as well as efficiency of the OFET. There are several important factors consider when using a blend of materials and some specific factors that are unique to the OFET. The complexity and range of possible blend microstructures increase when compare to a single component film and are dependent on the rate of solvent evaporation during processing, solution viscosities, surface properties of the substrate, the degree of crystallinity of the individual components and the miscibility of the components, etc. An understanding of charge transport mechanism in blend thin film and how the film microstructure correlates to OFET performance is needed in order to optimize the processing for electrical application. The ultimate goal being high mobility organic semiconducting blends systems that can self-assemble with solution processing, and allow gate dielectric and n- and p-type semiconductor positioning with suitable morphologies or crystallographic orientations in the OFET channels. In the three-year proposed project, the following issues will be addressed: (1) Development of novel conjugated polymers and small molecules semiconductors. (2) Three solution-processing methods (spin-coating, solution-shearing and ultrasonic spray-coating) to fabricate four organic polymer blends thin film ((i) small molecule semiconductors/insulating polymers; (ii) polymer semiconductors/insulating polymers; (iii) p-type small molecule semiconductors/n-type small molecules semiconductors; (iv) small molecule semiconductors/polymer semiconductors) for OFET applications. (3) Flexible electronics based on environmentally stable semiconducting polymer blends. (4) All solution-processed OFETs with defined electrode. (5) Complementary-like organic inverter comprised of semiconducting blends will be fabricated and measured. (6) Establish the relationship between the molecular design of organic semiconductors, mixing behavior of semiconducting blends, solution-processing parameters, blend thin film morphologies, molecular packing of semiconducting domains and device performance. |
