Investigation of photo induced change of electro optical performance in a liquid crystal organic field effect transistor (LC OFET)
Abstract This study aimed to improve the electrical characteristics of poly(3 hexylthiophene) (P3HT) and liquid crystal organic field effect transistors (LC OFETs) under UV illumination. Consequently, a novel LC OFET was fabricated using a nematic liquid crystal (E63) and a P3HT mixture in an OFET cell. Cell thickness was determined through field emission scanning electron microscopy. For assessment of the electrical characteristics, the LC OFET device was exposed to various UV light intensities in total darkness for the purpose of obtaining the output and transfer current voltage. The capacitance frequency plot of the capacitor cell was then measured to determine the main parameters including the threshold voltage (VTh) field effect mobility (mFET) and current on/off ratio (Ion/off) of the device. Thus, the full characterisation and UV light response of the electronic parameters were determined for this new class of transistors. Results showed that the new LC OFET exhibited good performance in the form of low VTh, high mFET, and high Ion/off.