Enhanced Environmental Stability Induced by Effective Polarization of a Polar Dielectric Layer in a Trilayer Dielectric System of Organic Field-Effect Transistors: A Quantitative Study

AbstractWe report a simple and mild fabrication of flexible organic field-effect transistors (OFETs) by an electrode-peeling transfer method. Firstly, fine patterns of source-drain metal electrodes were formed on a solid substrate, where a micro-patterning process such as photolithography is applicable. An organic dielectric layer (poly-chloro-p-xylylene) was deposited by a chemical vapor deposition. Then patterned gate electrode was deposited using a shadow mask. On the top surface of the gate electrode, another adhesive flexible substrate was fixed and the stack of the flexible substrate/gate electrode /dielectric layer /source-drain electrode was peeled away from the solid substrate. The peeling-transfer was completed with a help of a self-assembled monolayer of n-decyl mercaptan as a connecting buffer layer between the gold electrodes and the dielectric layer. Then an organic semiconductor material was deposited on the fresh peeled-off surface on the flexible substrate. When pentacene was used as the semiconductor material, the OFETs exhibited a hole mobility of 0.1 cm2/Vs and a current on/off ratio of 105.

Download Full-text

Solution-Processed Flexible Organic Field-Effect Transistors with Biodegradable Gelatin as the Dielectric Layer: An Approach Toward Biodegradable Systems

ACS Applied Electronic Materials ◽

10.1021/acsaelm.0c00648 ◽

2020 ◽

Vol 2 (10) ◽

pp. 3373-3379

Author(s):

Vivek Raghuwanshi ◽

Pulkit Saxena ◽

Sachin Rahi ◽

Ajay Kumar Mahato ◽

Ishan Varun ◽

...

Keyword(s):

Dielectric Layer ◽

Field Effect ◽

Field Effect Transistors ◽

Organic Field Effect Transistors ◽

Solution Processed

Download Full-text

Effect of temperature on hysteresis of dipolar dielectric layer based organic field-effect transistors: A temperature sensing mechanism

Sensors and Actuators A Physical ◽

10.1016/j.sna.2017.12.004 ◽

2018 ◽

Vol 269 ◽

pp. 491-499 ◽

Cited By ~ 1

Author(s):

Nimmakayala V.V. Subbarao ◽

Suman Mandal ◽

Murali Gedda ◽

Parameswar K. Iyer ◽

Dipak K. Goswami

Keyword(s):

Dielectric Layer ◽

Field Effect ◽

Field Effect Transistors ◽

Temperature Sensing ◽

Effect Of Temperature ◽

Organic Field Effect Transistors ◽

Sensing Mechanism

Download Full-text

Bandgap Engineering of an Aryl-Fused Tetrathianaphthalene for Visible-Blind Organic Field-Effect Transistors

Frontiers in Chemistry ◽

10.3389/fchem.2021.698246 ◽

2021 ◽

Vol 9 ◽

Author(s):

Lijuan Zhang ◽

Xinzi Tian ◽

Yantao Sun ◽

Jiarong Yao ◽

Shuyuan Yang ◽

...

Keyword(s):

Field Effect ◽

Large Scale ◽

Near Infrared ◽

Field Effect Transistors ◽

Ambient Air ◽

Operational Stability ◽

Environmental Stability ◽

Organic Field Effect Transistors ◽

Major Barrier ◽

Visible Blind

Stability problem of organic semiconductors (OSCs) because of photoabsorption has become a major barrier to large scale applications in organic field-effect transistors (OFETs). It is imperative to design OSCs which are insensitive to visible and near-infrared (VNIR) light to obtain both environmental and operational stability. Herein, taking a 2,3,8,9-tetramethoxy [1,4]benzodithiino[2,3-b][1,4]benzodithiine (TTN2) as an example, we show that controlling molecular configuration is an effective strategy to tune the bandgaps of OSCs for visible-blind OFETs. TTN2 adopts an armchair-like configuration, which is different from the prevailing planar structure of common OSCs. Because of the large bandgap, TTN2 exhibits no photoabsorption in the VNIR region and OFETs based on TTN2 show high environmental stability. The devices worked well after being stored in ambient air, (i.e. in the presence of oxygen and water) and light for over two years. Moreover, the OFETs show no observable response to light irradiation from 405–1,020 nm, which is also favorable for high operational stability.

Download Full-text