A Low Cost, Versatile Method for Thin Film Transistor Fabrication
Thin-film transistors made of inorganic semiconductor materials, such as silicon and gallium arsenide, have dominated the mainstream electronics industry. However, processing methods for fabricating modern semiconductor devices are complex, resulting in higher production costs. Organic Thin-Film Transistors (OTFTs) technology represents a promising alternative, due to easy processibility, compatibility with flexible substrates such as plastic, fabric, and skin, application diversity, and low cost.
However, commercialization of OTFTs has been hindered by insufficient device performance, prompting development of new methods for producing better quality organic thin films. The properties of the resulting films can vary considerably with the choice of deposition method, surface energy modifications, nature of dielectric, or post-processing. At the same time, the dependence of film morphology on processing parameters can offer an opportunity to improve the electrical properties of the organic devices.
Wake Forest University researchers have developed a novel method for controlling the crystallization of the organic semiconductor channel material in organic thin-film transistors. The measured device performance approaches the fundamental limits of the material, as determined from single crystal measurements.
- Carrier mobility (µ) of organic thin film transistors (obtained using the Wake Forest method) is similar to that obtained in single crystal transistors
- Method produces OTFTs that operate at low voltages and efficient power consumption
- Substantial capital equipment is not necessary to implement this method
- Relatively inexpensive method to adopt
- Method is easily transferred to the fabrication of other organic devices, such as organic photovoltaics, light emitting diodes and sensors
- In flexible displays, electronic paper, sensors, disposable and wearable electronics, medical applications, etc.
- Technology can be easily transferred to the fabrication of other organic devices, such as organic photovoltaics, light emitting diodes and sensors
- Designed and assembled, the experimental setup and efficiency of the method is demonstrated
- Demonstrated the performance and operation at low voltage for efficient power consumption
- Studies on electrical properties of the OTFT are complete
- Improvising the method to fabricate flexible devices is in progress
- Oana Jurchescu, PhD
- Peter Diemer
Stephen J. Susalka, PhD
Associate Director, Commercialization