Currently at imec, we are exploring the use of thin-film transistors (TFTs) based on amorphous oxide semiconductors (AOSs) for flexible analog electronics. In general, these TFTs have attractive characteristics, such as high uniformity, high electron mobility (10-50 cm2/V‧s) and can be fabricated at low temperatures on plastic substrates. However, they still present high noise levels that hinders their use in some analog applications, such as low voltage amplification.
Current TFTs were developed with priority on speed and small footprint at relative high voltage levels. Changes in the process flow, material stacks, interface and TFT architecture should be implemented to customize to the requirements of analog applications. The objective of this internship/thesis is to work on the microfabrication and characterization of TFTs and explore variations of our standard process flow that could achieve devices with low noise characteristics.
Significant effort will be placed on exploring the use of different gate dielectrics, reducing the defect density in the TFT channel and increasing the mobility of the TFTs. We will explore lower defect deposition processes like atomic layer deposition (ALD) for the dielectric. The project also entails the electrical characterization of the fabricated devices, specially focusing on the low-frequency noise. The student will explore different noise models to determine how to best predict the noise characteristics of the fabricated devices.
Previous cleanroom and fabrication experience are desired but not required.
Type of project: Internship or thesis
Duration: 5 months
Required degree: Master of Engineering Technology or Master of Science or Master of Engineering Science
Required background: Chemistry/Chemical Engineering, Electrotechnics/Electrical Engineering, Materials Engineering, Nanoscience & Nanotechnology, Physics
Supervising scientists: For further information or for application, please contact Horacio Londono Ramirez (Horacio.LondonoRamirez@nerf.be), Cedric Rolin (Cedric.Rolin@imec.be) and Manoj Nag (Manoj.Nag@imec.be).
Imec allowance will be provided