Electronic and optoelectronic applications of solution-processed two-dimensional materials

Jingyun Wang,Bilu Liu

doi:10.1080/14686996.2019.1669220

Jingyun Wang, Bilu Liu

Open Access

https://doi.org/10.1080/14686996.2019.1669220

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Abstract

ABSTRACT The isolation of graphene in 2004 has initiated much interest in two-dimensional (2D) materials. With decades of development, solution processing of 2D materials has becoming very promising due to its large-scale production capability, and it is therefore necessary to examine progress on solution-processed 2D materials and their applications. In this review, we highlight recent advances in the assembly of solution-processed 2D materials into thin films and the use of them for electronics and optoelectronics. We first present an overview about typical approaches to assemble solution-processed 2D materials into desired structures, including layer-by-layer assembly, Langmuir–Blodgett assembly, spin coating, electrophoretic deposition, inkjet printing, and vacuum filtration. Then, electronic and optoelectronic applications of such assembly films are presented, such as thin-film transistors, transparent conductive films, mechanical and chemical sensors, photodetectors and optoelectronic devices, as well as flexible and printed electronics. Finally, our perspectives on challenges and future opportunities in this important field are proposed.

Highlights

Two-dimensional (2D) materials have become a significant class of materials since Geim, Novoselov, and co-workers isolated graphene from graphite by the scotch tape exfoliation method in 2004 [1]
We first present an overview about typical approaches to assemble solution-processed 2D materials into desired structures, including layer-by-layer assembly, Langmuir–Blodgett assembly, spin coating, electrophoretic deposition, inkjet printing, and vacuum filtration
Due to their unique structures, multifunctionalities, and easy assembly feature, solution-processed 2D materials can be applied for different kinds of electrical-based sensors, including pressure or strain sensors, gas sensors, and biosensors

Summary

Introduction

Two-dimensional (2D) materials have become a significant class of materials since Geim, Novoselov, and co-workers isolated graphene from graphite by the scotch tape exfoliation method in 2004 [1]. Graphene and its derivatives like GO or reduced GO (rGO) are the pioneer 2D materials being studied to fabricate TFTs. Eda et al reported a vacuum-filtration assembly method for the deposition of rGO ultra-thin films [50]. This is because that the exfoliated 2D materials have more defects with small flake size and broad thickness distribution, which leads to poor quality of materials and unsatisfactory performance of electronics These problems can be overcome by developing highquality synthesis solution-based method and suitable solution assembly method which can achieve ultra-thin, high-quality and uniform 2D films and possess low-cost and scalable fabrication capability. A solution-processed method was explored to directly coat the graphene-based conductive film onto the pre-selected transparent substrate, silica They employed water-soluble GO as a filler so that the GO could completely fill the vacancy within organic polymers. 62 63 65 67 high-quality solution-processed 2D materials together with subtle assembly methods may be a suitable solution to this problem especially in future flexible and wearable devices area

Mechanical and molecule sensors

Photodetectors and optoelectronics

Flexible electronics

Printed electronics

Findings

Outlook and perspectives