Search query: organic field-effect transistors

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abstract: Heterogeneous interfaces that are ubiquitous in optoelectronic devices play a key role in the device performance and have led to the prosperity of today's microelectronics. Interface engineering provides an effective and promising approach to enhancing the device performance of organic field effect transistors (OFETs) and even developing new functions. In fact, researchers from different disciplines have devoted considerable attention to this concept, which has started to evolve from simple improvement of the device performance to sophisticated construction of novel functionalities, indicating great potential for further applications in broad areas ranging from integrated circuits and energy conversion to catalysis and chemical/biological sensors. In this review article, we provide a timely and comprehensive overview of current efficient approaches developed for building various delicate functional interfaces in OFETs, including interfaces within the semiconductor layers, semiconductor/electrode interfaces, semiconductor/dielectric interfaces, and semiconductor/environment interfaces. We also highlight the major contributions and new concepts of integrating molecular functionalities into electrical circuits, which have been neglected in most previous reviews. This review will provide a fundamental understanding of the interplay between the molecular structure, assembly, and emergent functions at the molecular level and consequently offer novel insights into designing a new generation of multifunctional integrated circuits and sensors toward practical applications.
author_names: Hongliang Chen

Weining Zhang

Mingliang Li

Gen He

Xuefeng Guo
title: Interface Engineering in Organic Field Effect Transistors: Principles, Applications, and Perspectives.
venue: Chemical reviews
year: 2020

author_names: Minjun Kim

Seung Un Ryu

Sang Ah Park

Kyoungwon Choi

Taehyun Kim

Dasol Chung

Taiho Park
title: Donor Acceptor Conjugated Polymer for High Performance Organic Field Effect Transistors: A Progress Report
venue: Advanced Functional Materials
year: 2019

author_names: Matthew Waldrip

Oana D Jurchescu

David J Gundlach

Emily G Bittle
title: Contact Resistance in Organic Field Effect Transistors: Conquering the Barrier
venue: Advanced Functional Materials
year: 2019

abstract: Solution printed organic single crystalline films hold great potential for achieving low cost manufacturing of large area and flexible electronics. For practical applications, organic field effect transistor arrays must exhibit high performance and small device to device variation. However, scalable fabrication of highly aligned organic crystalline arrays is rather difficult due to the lack of control over the crystallographic orientation, crystal uniformity, and thickness. Here, a facile solution printing method to fabricate centimeter sized highly aligned organic crystalline arrays with a thickness of a few molecular layers is reported. In this study, the solution shearing technique is used to produce large area, organic highly crystalline thin films. Water soluble ink is printed on the hydrophobic surface of organic crystalline films, to selectively protect it, followed by etching. It is shown that the addition of a surfactant dramatically changes the fluid drying dynamics and increases the contact line friction of the aqueous solution to the underlying nonwetting organic crystalline film. As a result, centimeter scale highly aligned organic crystalline arrays are successfully prepared on different substrates. The devices based on organic crystalline arrays show good performance and uniformity. This study demonstrates that solution printing is close to industrial application and also expands its applicability to various printed flexible electronics.
author_names: Shuming Duan

Tian-Yu Wang

Bowen Geng

Xiong Gao

Chenguang Li

Jincheng Zhang

Yuewen Xi

Xiaotao Zhang

Xiaochen Ren

Wenping Hu
title: Solution Processed Centimeter Scale Highly Aligned Organic Crystalline Arrays for High Performance Organic Field Effect Transistors.
venue: Advanced materials
year: 2020

abstract: The strong and controllable chemical sensitivity of organic semiconductors (OSCs) and the amplification capability of transistors in circuits make use of OSC based field effect transistors compelling for chemical sensors. Analytes detected and assayed range from few atom gas phase molecules that may have adverse health and security implications to biomacromolecules (proteins, nucleic acids) that may be markers for physiological processes and medical conditions. This review highlights recent progress in organic field effect transistor (OFET) chemical sensors, emphasizing advances from the past 5 years and including aspects of OSC morphology and the role of adjacent dielectrics. Design elements of the OSCs and various formats for the devices are illustrated and evaluated. Challenges associated with the present state of the art and future opportunities are also discussed.
author_names: Hui Li

Wei Shi

Jian Song

Hyun-June Jang

Jennifer Dailey

Junsheng Yu

Howard E Katz
title: Chemical and Biomolecule Sensing with Organic Field Effect Transistors.
venue: Chemical reviews
year: 2019

abstract: Over the past 25 years, organic field effect transistors (OFETs) have witnessed impressive improvements in materials performance by 3 4 orders of magnitude, and many of the key materials discoveries have been published in Advanced Materials. This includes some of the most recent demonstrations of organic field effect transistors with performance that clearly exceeds that of benchmark amorphous silicon based devices. In this article, state of the art in OFETs are reviewed in light of requirements for demanding future applications, in particular active matrix addressing for flexible organic light emitting diode (OLED) displays. An overview is provided over both small molecule and conjugated polymer materials for which field effect mobilities exceeding 1 cm2 V 1 s 1 have been reported. Current understanding is also reviewed of their charge transport physics that allows reaching such unexpectedly high mobilities in these weakly van der Waals bonded and structurally comparatively disordered materials with a view towards understanding the potential for further improvement in performance in the future.
author_names: Henning Sirringhaus
title: 25th Anniversary Article: Organic Field Effect Transistors: The Path Beyond Amorphous Silicon
venue: Advanced materials
year: 2014

abstract: Printable organic field effect transistors (OFETs) have been investigated for more than 20 years, aiming at various emerging applications including flexible/wearable electronics, displays and sensors. Since many comprehensive review articles for this field have been published, here we will focus on the recent progress of this field and address the following issues critical to the future applications of OFETs. First, downscaling technologies for the printing of OFETs with fine resolution will be reviewed. The approaches for short channels and small overlapping as well as patterning of organic semiconductors are summarized. Second, various approaches for realizing low voltage OFETs will be presented, which are critical to the power consumption of organic devices. Specifically, the operational voltages of OFETs have been successfully decreased to several volts by increasing the gate dielectric capacitance and reducing the sub gap density of states at the channel. This review will provide guidelines for material design and fabrication processes of OFETs with high performance and advanced applications.
author_names: Wei Tang

Yukun Huang

Lei Han

Ruili Liu

Yuezeng Su

Xiaojun Guo

Feng Yan
title: Recent progress in printable organic field effect transistors
year: 2019

abstract: Abstract Crystal orientation is one of the key parameters for organic field effect transistors (OFETs) Here, DPP based material with polymer as additive was carried out to fabricate self assembly organic crystals. By optimizing the blend ratios and concentrations of the solution, well aligned, high quality crystals were successfully achieved. Optical microscope, scanning electron microscope (SEM) and X ray diffraction (XRD) were used to characterize the crystals. OFET devices were made using the crystals grown under the optimal condition. Comparing with the devices made by thin films, mobility fabricated by crystals is two order of magnitude higher. We anticipate our finding will promote the development of the field.
author_names: Sheng Bi

Yu Li

Zhengran He

Zhongliang Ouyang

Qinglei Guo

Chengming Jiang
title: Self assembly diketopyrrolopyrrole based materials and polymer blend with enhanced crystal alignment and property for organic field effect transistors
venue: Organic Electronics
year: 2019

abstract: Benefiting from the advantages of organic field effect transistors (OFETs) including synthetic versatility of organic molecular design and environmental sensitivity, gas sensors based on OFETs have drawn much attention in recent years. Potential applications focus on the detection of specific gas species such as explosive, toxic gases, or volatile organic compounds (VOCs) that play vital roles in environmental monitoring, industrial manufacturing, smart health care, food security, and national defense. To achieve high sensitivity, selectivity, and ambient stability with rapid response and recovery speed, the regulation and adjustment of the nano/microstructure of the organic semiconductor (OSC) layer has proven to be an effective strategy. Here, the progress of OFET gas sensors with nano/microstructure is selectively presented. Devices based on OSC films one dimensional (1D) single crystal nanowires, nanorods, and nanofibers are introduced. Then, devices based on two dimensional (2D) and ultrathin OSC films, fabricated by methods such as thermal evaporation, dip coating, spin coating, and solution shearing methods are presented, followed by an introduction of porous OFET sensors. Additionally, the applications of nanostructured receptors in OFET sensors are given. Finally, an outlook in view of the current research state is presented and eight further challenges for gas sensors based on OFETs are suggested.
author_names: Shi-qi Zhang

Yiwei Zhao

Xiaowen Du

Yingli Chu

Shen Zhang

Jia Huang
title: Gas Sensors Based on Nano/Microstructured Organic Field Effect Transistors.
venue: Small
year: 2019

abstract: The emergence of flexible organic electronics that span the fields of physics and biomimetics creates the possibility for increasingly simple and intelligent products for use in everyday life. Organic field effect transistors (OFETs) with their inherent flexibility, light weight, and biocompatibility, have shown great promise in the field of biomimicry. By applying such biomimetic OFETs for the internet of things (IoT) makes it possible to imagine novel products and use cases for the future. Recent advances in flexible OFETs and their applications in biomimetic systems are reviewed. Strategies to achieve flexible OFETs are individually discussed and recent progress in biomimetic sensory systems and nervous systems is reviewed in detail. OFETs are revealed to be one of the best systems for mimicking sensory and nervous systems. Additionally, a brief discussion of information storage based on OFETs is presented. Finally, a personal view of the utilization of biomimetic OFETs in the IoT and future challenges in this research area are provided.
author_names: Wei Shi

Yunlong Guo

Yunqi Liu
title: When Flexible Organic Field Effect Transistors Meet Biomimetics: A Prospective View of the Internet of Things.
venue: Advanced materials
year: 2019