Low-voltage organic field-effect transistors based on diketopyrrolopyrrole (DPP) copolymer using selfassembled monolayers-Passivated HfOx dielectrics

18^th International Conference and Exhibition on Materials Science and Engineering

May 28-30, 2018 Osaka, Japan

Myeongjae Lee, Dae Kyu Kim, BongSoo Kim and Jong Ho Choi

Korea University, South Korea
Ewha Womans University, South Korea

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

High performance organic field effect transistors (OFETs) operating at low-voltages (Vop) were fabricated and characterized. A diketopyrrolopyrrole and quaterthiophene copolymer (PDPP2DT-T2) was spin coated as a channel material in air and HfOx gate dielectrics were treated with self-assembled monolayers (SAMs) of n-octyltrichlorosilane (OTS), n-octadecyltrichlorosilane (ODTS) and n-dodecylphosphonic acid (PA-C12). The high capacitance and low leakage current of the SAM-passivated HfOx dielectrics enabled the devices to operate at Vop below 4 V. Especially, the ODTS-passivated HfOx-based OFETs presented a high mobility of 1.54 cm2 V-1s-1, an on/off current ratio of 1.4Ã?Â?104 and a threshold voltage of -0.8 V in air. The results showed demonstrate a simple and efficient process for fabricating high-performance PDPP2DT-T2 copolymer-based transistors working at low Vop.

Biography :

Myeongjae Lee has completed his BS in Department of Chemistry and Advanced Materials from Gangneung-Wonju National University and currently, he is a PhD student under the supervision of Prof. Jong-Ho Choi from Korea University. His research focuses on the synthesis of organic electronic materials and characterization of organic optoelectronic device science.
Email:sorofam@naver.com