Van der Waals Assembled Solution-processed Organic Monolayer Single-Crystal Transistor for Electrocardiograph Sensing

He，Zhenfei1; Dai，Derek Shui Hong Siddhartha1,2; Chen，Ming1; Zou，Deng1,2; Chik，Gary Kwok Ki1,2; Rafael，Rémi1; Lee，Kin Hang1; Piao，Yingzhe1,3; Zhang，Shiming4; Cheng，Xing3; Chan，Paddy Kwok Leung1,2

2022

10.1002/adfm.202205129

ADVANCED FUNCTIONAL MATERIALS   Impact Factor & Quartile

1616-301X

1616-3028

Solution-processed organic semiconductors (OSCs) promote the development of the next generation of large-area, low-cost flexible electronics. To date, the properties of the flexible substrates such as chemical compatibility, roughness, and surface energy are still big challenges for the solution process, especially for high-performance ultrathin monolayer OSCs. Herein, van der Waals assembled organic field-effect transistors (OFETs) with layer-by-layer lamination processes are reported. The active layer is an ultrathin single molecular layer 2,9-Didecyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (C-DNTT) which maintains decent electrical fidelity with mobility of 10.4 cm V s after transfer. With the active layer transfer technique, the bias stability of OFETs can be significantly improved by tuning diverse hydrophobic self-assembly monolayers (SAMs) onto the dielectric which is a challenging task before the solution processing organic monolayer. A small subthreshold swing (SS) of 63 mV decade is achieved by low surface energy phosphonic acid SAMs on high-κ AlO dielectric. We further demonstrate a high-gain organic inverter amplifier that can be powered up by a coin cell on the 1.5 µm conformal parylene substrate and apply it for high-resolution electrocardiograph (ECG) sensing. The ECG sensors can provide a signal-to-noise ratio as high as 34 dB. It is believed that our device demonstrates the prospect of continuous monitoring for human health management.

conformal devices ECG sensing monolayer crystals OFET fabrications

SCI ; EI

English

NI Journal Papers

Others

General Research Fund (GRF)[HKU 17204517]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000865634600039

WILEY-V C H VERLAG GMBH

20223212550366

Electrocardiography ; Electronic properties ; Flexible electronics ; Interfacial energy ; Monolayers ; Single crystals ; Substrates ; Van der Waals forces

Medicine and Pharmacology:461.6 ; Electricity: Basic Concepts and Phenomena:701.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Electronic Equipment, General Purpose and Industrial:715 ; Physical Chemistry:801.4 ; Atomic and Molecular Physics:931.3 ; Crystalline Solids:933.1

MATERIALS SCIENCE

2-s2.0-85135526028

Scopus

1.Department of Mechanical Engineering,The University of Hong Kong,Pokfulam,Hong Kong
2.Advanced Biomedical Instrumentation Centre,Hong Kong
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Electrical and Electronic Engineering,The University of Hong Kong,Pokfulam,Hong Kong

He，Zhenfei,Dai，Derek Shui Hong Siddhartha,Chen，Ming,et al. Van der Waals Assembled Solution-processed Organic Monolayer Single-Crystal Transistor for Electrocardiograph Sensing[J]. ADVANCED FUNCTIONAL MATERIALS,2022,32(41).

He，Zhenfei.,Dai，Derek Shui Hong Siddhartha.,Chen，Ming.,Zou，Deng.,Chik，Gary Kwok Ki.,...&Chan，Paddy Kwok Leung.(2022).Van der Waals Assembled Solution-processed Organic Monolayer Single-Crystal Transistor for Electrocardiograph Sensing.ADVANCED FUNCTIONAL MATERIALS,32(41).

He，Zhenfei,et al."Van der Waals Assembled Solution-processed Organic Monolayer Single-Crystal Transistor for Electrocardiograph Sensing".ADVANCED FUNCTIONAL MATERIALS 32.41(2022).