| 摘要: | 當今傳統石化能源的短缺和環境汙染問題重視，綠色能源和環境友好多元化利用成為有系統解決此問題一個重要技術途徑。熱電材料為一種利用半導體中電荷傳輸來實現熱能和電能直接轉換的功能材料，而無機半導體材料是當前性能最佳的熱電材料，然而由於其原材料資源有限及加工技術複雜且重金屬具毒性等侷限而難以實現大規模工業化應用。然而有機材料製備有機熱電元件對未來發展極為關鍵，由於其具備分子設計調控性能、可溶液低溫製程、印刷性、低成本及大面積製作等優勢，若能有效地開發高熱電特性、可靠性及環境穩定性等有機熱電元件，發展市場潛力將可提昇，相信此舉對人類未來經濟發展與生態環境之維持有極重要貢獻。為了達成高效能有機熱電元件，將以溶液法製備有機摻雜熱電薄膜和有機混成複合熱電薄膜。將設計一系列新型P型和N型有機小分子和高分子半導體與特定摻雜物進行摻雜效應，及此新型高分子半導體與高熱電效能的無機半導體或奈米碳材進行混成製備成膜和元件。三年研究計畫目標如下：(1)有機高分子及小分子半導體開發。(2)溶液製程製備有機及其混摻薄膜並應用於熱電元件。(3)熱電元件最適化技術。(4)建立有機熱電電材料中分子結構、溶液製程參數、混摻薄膜形態、半導體分子排列、元件效能關係。(5)軟性熱電模組整合。 ;Green technology has attracted much attention in recent years due to the fear of exhaustion of traditional fossil sources and the rising awareness of environmental protection. Thermoelectric technology is an auxiliary energy technique that can directly convert waste heat to electricity. This green energy-saving technology is considered to be a promising way to relieve the pressure of energy and environment. However, traditional inorganic thermoelectric materials pose significant challenges due to high cost (highly complex vacuum processing route), toxicity (element such as Pb, Bi and Te), scarcity (relatively low earth abundance), as well as brittleness particularly when it comes to applications requiring flexibility. On the other hand, organic materials possess excellent flexibility in comparison with conventional thermoelectric materials, which constitute their particular advantages in flexible applications Furthermore, benefitting from striking developments in organic electronics, organic materials have been widely considered, with the unique features of fine-tuned electrical properties via molecular design, solution processability and light weight. More importantly, the low thermal conductivity of organic materials offers potential for possessing high thermoelectric performance, especially at low temperatures. The combination of these features makes organic thermoelectrics an emerging interdisciplinary research frontier, which can open up new opportunities for thermoelectrics with their inorganic counterpart.To achieve high performance of organic thermoelectric materials, doping organic semiconductors and polymer composite will be prepared. Doping is an effective approach to improve the power factor by raising the electrical conductivity and is one of the most widely used strategies to improve the thermoelectrics performance of organic-based materials. In addition to optimizing the carrier concentration and increasing the carrier mobility to improve the thermoelectric performance, the structure-property relationship in organic thermoelectric materials for molecular structures such as backbones and side substitutes will be studied based on newly developed organic semiconductors. On the other hand, polymer nanocomposites can possess polymer characteristics such as low thermal conductivity, solution-based processability, and mechanical flexibility. Meanwhile fillers can control carrier transport to provide an alternative way of optimizing the tradeoff between the electrical and thermal properties. The carbon-based nanomaterials and inorganic materials with high thermoelectric performances could be candidates as fillers for synthesizing polymer composites. Low bandgap donor-acceptor conjugated polymers with good semiconducting properties will be used for polymer matrix.In the three-year proposed project, the following issues will be addressed: (1) Development of novel conjugated polymers and small molecules semiconductors. (2) Solution-processing methods to fabricate thin film for organic thermoelectric application. (3) Analysis in device physics and optimization. (4) Establish the relationship between molecular design of organic thermoelectric materials, mixing behavior of hybrid materials, solution-processing parameters, thin film morphologies and molecular packing of semiconducting domains and device performance. (5) Integration for flexible thermoelectric module. |
