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Title: | 全噴墨有機半導體材料電性提升之研究 - 奈米碳粒子/石墨烯摻雜效應 The improvement of electrical performance in all inkjet printing organic-semiconducting material:the effect of blending nanocarbon particle and graphene |
Authors: | Chun-Hao Hsu 許峻豪 |
Advisor: | 林致廷 |
Keyword: | 石墨烯,有機薄膜電晶體,有機-無機混合法,預滲理論,局部電場增強效應, graphene,OTFTs,organic-inorganic hybrid,percolation theory,local field enhancement effect, |
Publication Year : | 2012 |
Degree: | 博士 |
Abstract: | 軟性電子(flexible electronics)研究近年來吸引大量研究人員投入此領域,由於軟性電子具有輕薄可撓性、低成本、大面積製造、低溫製程等優點。基於這些優點,因此軟性電子具有大量的應用端,應用領域非常廣泛,其中軟性顯示器被認為是下一代的發展重點商品。但是作為顯示器當中重要的元件—有機薄膜電晶體(organic thin film transistor, OTFTs),其效能與穩定性尚未成熟,因此大量研究團隊研究改善有機薄膜電晶體電性。
在此研究論文使用有機-無機混合法(organic-inorganic hybrid method),摻雜奈米碳粒子(nanocarbon particle)與石墨烯(graphene)於有機半導體中,利用自製噴墨系統製作全噴墨有機薄膜電晶體,提升有機薄膜電晶體的有效載子漂移率(effective mobility)。 除了電性提升,本研究論文透過接觸電阻量測分析有機半導體與電極介面特性,以及通道區域電阻,建立有機-無機混合法對元件的接觸電阻與通道電阻的改善機制。並且根據預滲理論(percolation theory)得知摻雜濃度與有效載子漂移率的關係,建立摻雜濃度造成有機薄膜電晶體的3個階段電性變化,與最佳摻雜濃度。根據材料分析,其中包含X光繞射分析(XRD),傅立葉轉換紅外線光譜(FTIR spectra),紫外-可見光光譜分析(UV-vis spectra)與光致螢光光譜分析Photoluminescence spectra,探討摻雜效應對有機半導體的影響,結合上述分析,可得知摻雜有機薄膜電晶體電性改善機制與載子傳輸方式。最後發展奈米碳粒子局部電場增強 (local field enhancement)理論與模擬,根據模擬結果說明奈米碳粒子摻雜有機半導體中,對於半導體層有局部電場增強效應,與有機薄膜電晶體的電性提升。 In the recent years, the research field of flexible electronics attracts a lot of researchers due to its low weight, flexible property, low cost, large area fabrication and low temperature manufacturing. Based on these advantages, there are a lot of applications in the field of soft electronics. Among these applications, flexible display is thought as the one of the next generational technology. In this technology, one of the important devices is the organic thin film transistor (OTFT). However, the implementation of OTFT is limited because of its performance and stability. As a consequence, researchers have devoted into the OTFTs to improve the electrical properties. In this work, the organic-inorganic hybrid method was used to add nanocarbon particles and graphene into the organic semiconductor material. Utilizing the homemade inkjet printing system, this newly developed material can be used to improve the effective mobility of the organic thin film transistors. Moreover, the contact resistance was used to analyze the interface property between the organic semiconductor channel region and the electrodes. Based on this experimental result, the improvements in contact resistance and channel resistance were demonstrated. According to the percolation theory, in advance, the experimental data can be fitted well. Following the theory, the relationship between the concentration in hybrid materials and the effective mobility can be also obtained. In addition, the 3-stage electrical property of the developed OTFTs was established and the optimal concentration condition was identified. To have detail analysis of material, furthermore, XRD, FTIR, UV-Vis, and PL spectra were used to study the effect of the developed organic semiconductor hybrid material. Finally, the local field enhancement theory and simulations of the nanocarbon particle array was developed. This simulation result demonstrated the local field enhancement effect to organic semiconductor and illustrated the root of improvements in OTFTs |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16505 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 電子工程學研究所 |
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