Printed Organic Complementary Inverter with Single SAM Process Using a p-type D-A Polymer Semiconductor

Yasunori Takeda,Tomohito Sekine,Hiroyuki Matsui,Tomohide Murase,Rei Shiwaku,Daisuke Kumaki,Shizuo Tokito

doi:10.3390/app8081331

Yasunori Takeda, Tomohito Sekine + Show 5 more

Open Access

https://doi.org/10.3390/app8081331

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Abstract

The demonstration of the complementary integrated circuit using printing processes is indispensable for realizing electronic devices using organic thin film transistors. Although complementary integrated circuits have advantages such as low power consumption and a wide output voltage range, complementary integrated circuits fabricated by the printing method have problems regarding driving voltage and performance. Studies on fabrication processes of electronic circuits for printing technology, including optimization and simplification, are also important research topics. In this study, the fabrication process of the printed complementary integrated circuit was simplified by applying a p-type donor-acceptor (D-A) polymer semiconductor, which is not strongly affected by the electrode work function. An inverter circuit and the ring oscillator circuit were demonstrated using this process. The fabricated ring oscillator array showed excellent performance, with low voltage operation and low performance variation.

Highlights

The advantage of employing polymer semiconductors in the organic transistor fabrication process is the improvement of the film-forming property due to the high viscosity of the semiconductor ink, and the reduction of variation in the electrical characteristics [1] due to the formation of a uniform film
A complementary organic integrated circuit was realized by adapting a p-type D-A polymer semiconductor [21,22,23,24], which can obtain transistor characteristics even if it is modified with self-assembled monolayer (SAM) material for an n-type semiconductor for the source/drain electrodes of the p-type organic thin-film transistors (OTFTs)
The transfer (Figure 2c) and output (Figure 2d) characteristics of the fabricated OTFTs that make up the integrated circuit were measured using a semiconductor parameter analyzer in ambient air conditions

Summary

Introduction

The advantage of employing polymer semiconductors in the organic transistor fabrication process is the improvement of the film-forming property due to the high viscosity of the semiconductor ink, and the reduction of variation in the electrical characteristics [1] due to the formation of a uniform film. A printing fabrication process using organic materials that can be made into ink facilitates continuous large area device and mass production, and roll to roll (R2R) becomes possible by using a flexible substrate created in a low-temperature process [3,4,5,6]. An advantage of the complementary organic integrated circuit composed of p-type and n-type organic thin film

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Conclusion