N-type Organic Field Effect Transistor Based on Caffeine Derivatives

Abstract

Field effect transistors, one of the most popular electronic devices, have drawn much attention due to their wide application in integrated circuits. Compared to the inorganic silicon-based FETs, organic field effect transistors (OFETs) have the advantage of being flexible and low-cost. As a result of this, OFETs have been extensively studied to improve their performance, including threshold voltage, on/off ratio and mobility. In this thesis, the first two chapters introduce semiconductor materials and devices. In Chapter 3, our work, the synthesis and fabrication of N-type OFETs is demonstrated. In our study, C-H activation, a cheap, green and environment-friendly method is used to make caffeine derivatives. Furthermore, two different alkyl substituents have been introduced to the caffeine unit to compare their performances in OFETs.