聚(三-己基噻吩)排列性之改善與光電性質研究

Optoelectronic Properties And Improve Directional Of Poly(3-hexylthiophene)

周英勛(Ying-Shiun Chou)

指導教授 ： 蔣見超

國立中正大學/工學院/光機電整合工程研究所/碩士(2012年)

摘要

本研究所使用之rr-P3HT是利用格林置換反應，合成出高立體規則度聚(三-己基噻吩) (rr-Poly(3-hexylthiophene)；rr-P3HT)高分子，並且經由陰離子聚合方法來進行末端官能化步驟，合成出末端具有矽氧烷之高分子P3HT-(Si(OCH3)3)2。由核磁共振儀 (Nuclear Magnetic Resonance Spectroscopy, NMR) 驗證結構；能量散射光譜儀 (Energy Dispersive Spectrometer, EDS) 及X射線光電子能儀 (X-ray photoelectron spectroscopy, XPS)探討材料元素；TGA探討熱性質；UV/Vis. 分析，在薄膜態有明顯紅位移且鍵結上Si元素有藍移現象； AFM、XRD 探究結晶性及排列性。

最後，將P3HT-(Si(OCH3)3)2做成有機薄膜電晶體之半導體層，飽和電流從鍵結前11 nA至鍵結後47 nA，mobility從3.75x10-5 cm2/V.s提升至3.44x10-4 cm2/V.s，起始電壓從11V下降至-6V。

關鍵字

自組裝分子層

並列摘要

The study is to synthesis high regioregular Poly(3-hexylthiophene)(rr-P3HT) by Modified Grignard Metathesis(GRIM), and then functionalize this polymer with a thiol terminal group by anionic polymerization(P3HT-(Si(OCH3)3)2). The structure of polymer has been confirmed by NMR. The element of polymer has been confirmed by EDS and XPS. The thermal properties have been investigated by TGA. The UV-Vis spectrum shows that the thin film samples have red shift compared to the solution samples, and the silicon caused a blue shift of the wavelength. The crystallinity and orientation have been investigated by AFM and XRD.
Finally, P3HT of different molecular weights and corresponding P3HT-(Si(OCH3)3)2 were used as the semi-conducting layer for fabricating Organic Thin Film Transistors(OTFTs). The saturation current increases from 11 nA to 47 nA, the mobility increases from 3.75x10-5 cm2/V.s to the maximal 3.44x10-4 cm2/V.s and the threshold voltage decreases from 11 V to -6V.

並列關鍵字

Self Assembled Monolayer

參考文獻

[42] Vermeulen L.A., Huang K., "Electrosynthesis of new polysilynes:

[1] P. Buvat and P. Hourquebie, "Enhanced infrared properties of regioregular poly (3-alkylthiophenes)," Macromolecules, vol. 30, pp. 2685-2692, 1997.

[2] L.A. Majewski and M. Grell, "Organic field-effect transistors with ultrathin modified gate insulator," Synthetic Metal, vol. 151, pp.175-179, 2005.

[3] L. Yang, et al., "Theoretical studies on the electronic and optical properties of two new alternating fluorene/carbazole copolymers," Journal of computational chemistry, vol. 26, pp. 969-979, 2005.

[5] T. Yamamoto, et al., "Preparation of thermostable and electric-conducting poly (2, 5-thienylene)," Journal of Polymer Science: Polymer Letters Edition, vol. 18, pp. 9-12, 2003.