System on Chip Chemical Process Research Center, Department of Chemical Engineering, Pohang University of Science and Technology, POSTECH, Pohang 790-784, Korea.
ACS Appl Mater Interfaces. 2012 Feb;4(2):982-9. doi: 10.1021/am201622j. Epub 2012 Feb 7.
Composite films of multiwall carbon nanotube (MWNT)/poly(3,4-ethylenedioxythiophene) polymerized with poly(4-styrenesulfonate) (PEDOT:PSS) were prepared by spin-coating a mixture solution. The effect of the MWNT loading and the MWNT oxidation, with acid solution or ultraviolet (UV)-ozone treatment, on the film properties such as surface roughness, work function, surface energy, optical transparency and conductivity were studied. Also pentacene thin film transistors and inverters were made with these composite films as a contact metal and the device characteristics were measured. The oxidation of MWNT reduced the conductivity of MWNT/PEDOT:PSS composite film but increased the work function and transparency. UV-ozone treated MWNT/PEDOT:PSS composite film showed higher conductivity (14000 Ω/□) and work function (4.9 eV) than acid-oxidized MWNT/PEDOT:PSS composite film and showed better performance as a source/drain electrode in organic thin film transistor (OTFT) than other types of MWNT/PEDOT:PSS composite films. Hole injection barrier of the UV-ozone treated MWNT/PEDOT:PSS composite film with pentacene was significantly lower than any other films because of the higher work function.
多壁碳纳米管（MWNT）/聚（3,4-亚乙基二氧噻吩）与聚（4-苯乙烯磺酸盐）（PEDOT：PSS）的复合膜通过旋涂混合溶液制备而成。研究了 MWNT 负载量以及 MWNT 的氧化（用酸溶液或紫外线（UV）-臭氧处理）对膜性能的影响，如表面粗糙度、功函数、表面能、光学透明度和电导率。还使用这些复合膜作为接触金属制作了五苯并芘薄膜晶体管和逆变器，并测量了器件特性。MWNT 的氧化降低了 MWNT/PEDOT：PSS 复合膜的电导率，但提高了功函数和透明度。与酸氧化的 MWNT/PEDOT：PSS 复合膜相比，UV-臭氧处理的 MWNT/PEDOT：PSS 复合膜具有更高的电导率（14000 Ω/□）和功函数（4.9 eV），并在有机薄膜晶体管（OTFT）中作为源/漏电极表现出更好的性能，优于其他类型的 MWNT/PEDOT：PSS 复合膜。由于较高的功函数，用五苯并芘处理的 UV-臭氧 MWNT/PEDOT：PSS 复合膜的空穴注入势垒明显低于其他任何膜。
