Investigation of Using Contact and Non-contact Printing Technologies For Organic Transistor Fabrication
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Investigation of Using Contact and Non-contact Printing Technologies For Organic Transistor Fabrication Jie Zhang*, Paul Brazis, A. Roy Chowdhuri, John Szczech and Dan Gamota Motorola Advanced Technology Center Schaumburg, IL * For correspondence: [email protected] or 847.538.6847
1. Abstract Low cost, high volume manufacturing processes are envisioned for solution processable organic semiconductor integrated circuits (IC) fabrication. The organic IC may be the low cost solution for driving electronic devices, i.e. smart cards, RFID tags, flexible displays, personal area networks, and body area networks. This study investigated the manufacturability of organic electronics (organic field effect transistors (OFETs), organic light emitting diodes (OLEDs), etc.) using commercially available printing technologies and materials systems qualified for use in microelectronic products. The evaluated contact printing technologies were pad printing and screen-printing; the non-contact printing technologies were ink jetting and micro dispensing. The material system selection for transistor structures and active layers was based on printing technology requirements and commercial availability. The materials were polymer thick film conductors and insulators, conductive nano-particle suspensions, and organic polymer systems. A series of material property characterization and printing process development studies were conducted. Several OFET designs were created and functional all printed organic transistors were demonstrated. The device electrical performance was characterized.
2. Introduction The discovery of organic materials having attractive optoelectrical and semiconducting properties has led to a revolution in the electronics industry where large area flexible electronics are becoming possible. Large area flexible displays are envisioned for future visual communication devices1,2 because of their flexibility, lightweight and potential low cost. Moreover, low cost organic electronics may be realized by fabricating all printed organic circuits using commercially available materials and printing technologies. This study investigates the use of commercially available contact and non-contact printing technologies to fabricate organic transistors in a non-clean room manufacturing environment without the use of vacuum processing.
3. Printing Technologies and Materials Systems 3.1 Printing technology overview Traditional semiconductor fabrication consists of many complex and sensitive manufacturing technologies, i.e. photolithography, chemical vapor deposition, physical vapor deposition, electroplating, etc. Many of these processes are performed in Class 100 clean rooms and/or vacuum environments. The manufacturing costs of semiconductor technologies are justified for the required high operating speeds and performance of the IC. The organic semiconducting technologies, on the other hand, offers opportunities for low cost manufacturing of emerging products, i.e. personal area network nodes and transponders, and devices for surve
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