All organic electronic passive components and all organic FET by inkjet printing
Date Issued
2006
Date
2006
Author(s)
Her, Geng-Tai
DOI
zh-TW
Abstract
During 1980’s, functional organic devices were proposed. After that, the technology has been advanved dramatically. This trend continuous for the past few years as more and more researchers has begun to apply organic semiconductor technology to microelectronics and target on the application of e-paper, flexible display, and plastic chips.
With these solution based organic functional materials become widely available, low cost printing industry has found its way to impact microelectronics field. There are many advantages of printing based process, which includes quick time to mass production, high manufacturing speed, easy to operate, and low cost, etc. As inkjet printing is one of the printing manufacture methods, it has all of the above-mentioned merits. Nevertheless, inkjet printing provides us with a tool to modify the desired pattern globally or locally.
In this dissertation, the potential of using inkjet printing system to manufacture organic electronic devices such as resistors, capacitors, and transistors, etc. were shown. As using resistors by inkjet printing, it was shown that PEDOT/PSS water solution can be adopted by the inkjet printing system. On the other hand, in order to improve conductivity, DMSO was added into the PEDOT/PSS water solution. The resistors were also successful manufactured by inkjet printing system using PEDOT/PSS solution with DMSO as addtitive. Its conductivity is 333 S/cm much higher than previous published result, 200 S/cm.
Making capacitors by inkjet printing were also achieved by using PVP as the dielectric layer. Proper solvent ratio for mixing isopropanol and DMSO was identified, which eliminates the “coffee ring” effect and can improve morphology of the PVP thin film. The capacitor was successfully fabrciated, and very high capacitance value per unit area of organic capacitors, 67PF/1.2mm^2 was achieved.
In the process of making transistor by inkjet printing, an all prnting organic field effect transistor with 120um channel length was successfully made. The active layer is fabrciated by drop casting P3HT and the mobility obtained is 0.00545cm^2/V-s . Pentacene was also tried to deposite with thermal evaporator as active material and the mobility of the Pentacene transistor obtained was found to be higher than 0.02cm^2/V-s.
The passive and active organic electronic components are successfully demonstrated to be able to fabricate using all inkjet printing method in this dissertation, and provide a good starting point on the fabrication of all organic all printed electronic circuits.
Subjects
噴頭
噴墨系統
有機被動元件
有機電晶體
print head
inkjet printing
organic passive components
organic FET
Type
thesis
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