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Zhen Liu

Bio: Zhen Liu is an academic researcher from Hefei University of Technology. The author has contributed to research in topics: Semiconductor & Algorithm. The author has an hindex of 6, co-authored 8 publications receiving 100 citations.

Papers
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Journal ArticleDOI
TL;DR: One-step deposition of bi-functional semiconductor-dielectric layers for organic field effect transistors (OFETs) is an effective way to simplify the device fabrication.
Abstract: One-step deposition of bi-functional semiconductor–dielectric layers for organic field-effect transistors (OFETs) is an effective way to simplify the device fabrication. However, the proposed method has rarely been reported in large-area flexible organic electronics. Herein, we demonstrate wafer-scale OFETs by bar coating the semiconducting and insulating polymer blend solution in one-step. The semiconducting polymer poly(3-hexylthiophene) (P3HT) segregates on top of the blend film, whereas dielectric polymethyl methacrylate (PMMA) acts as the bottom layer, which is achieved by a vertical phase separation structure. The morphology of blend film can be controlled by varying the concentration of P3HT and PMMA solutions. The wafer-scale one-step OFETs, with a continuous ultrathin P3HT film of 2.7 nm, exhibit high electrical reproducibility and uniformity. The one-step OFETs extend to substrate-free arrays that can be attached everywhere on varying substrates. In addition, because of the well-ordered molecula...

46 citations

Journal ArticleDOI
TL;DR: A phase-separation method has been developed to control the semiconductor thickness and molecular arrangement via the semiconducting/insulating polymer blend system, and the ultrathin films show high bias stability and weak decay after 24 days with a bottom-gate configuration.
Abstract: A phase-separation method has been developed to control the semiconductor thickness and molecular arrangement via the semiconducting/insulating polymer blend system. The thickness of the poly(3-hexylthiophene) film has been regulated from 10.5 ± 1.4 nm down to 1.9 ± 0.8 nm with a favorable self-assembly degree and the mobility ranging from 0.21 to 0.03 cm2 V-1 s-1. The ultrathin films show high bias stability and weak decay after 24 days with a bottom-gate configuration. Benefited from a good molecular order, the films have low activation energy and a 2D charge transport profile in semiconductor layers. Moreover, this blending process can be used as a general strategy of thickness control in flexible low-voltage devices and donor-acceptor-conjugated polymers.

30 citations

Journal ArticleDOI
TL;DR: The outstanding performance of the NIR OPTs indicates that the development of wearable electronics is, indeed, possible, and the typical n-type transistor characteristics at a voltage below 5 V are exhibited.
Abstract: Flexible and low-voltage near-infrared organic phototransistors (NIR OPTs) were prepared with a low-band gap donor–acceptor conjugated polymer as the semiconductor layer and n-octadecyl phosphonic acid modified anodic alumina (AlOx/ODPA) as the insulating layer. The phototransistors exhibit the typical n-type transistor characteristics at a voltage below 5 V. The photosensitivity of phototransistors can be enhanced by regulating the packing densities of the ODPA self-assembled monolayers and forming different trap states. The enhanced OPTs exhibit good photosensitivity to 808–980 nm NIR with the photocurrent/dark current ratio and photoresponsivity as high as 5 × 103 and 20 mA W–1, respectively, benefiting from the charge-trapping effect at the AlOx/ODPA interface. The OPTs also present a fast optical switching speed of 20/30 ms and an excellent mechanical flexibility. The outstanding performance of the NIR OPTs indicates that the development of wearable electronics is, indeed, possible.

24 citations

Journal ArticleDOI
TL;DR: In this article, a strategy was developed for the chiral detection of L-His using an organic electrochemical transistor (OECT) sensor based on molecularly imprinted polymer (MIP).

22 citations

Journal ArticleDOI
TL;DR: In this article, the relationship between the P3HT film thickness and charge transport performance was studied, and it was found that the mobility decreased slightly with the decrease of the TP film thickness.

13 citations


Cited by
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Journal ArticleDOI
TL;DR: An all-inclusive review of the newly developed WFHE along with a summary of imperative requirements of material properties, sensor capabilities, electronics performance, and skin integrations is provided.
Abstract: Recent advances in soft materials and system integration technologies have provided a unique opportunity to design various types of wearable flexible hybrid electronics (WFHE) for advanced human healthcare and human-machine interfaces. The hybrid integration of soft and biocompatible materials with miniaturized wireless wearable systems is undoubtedly an attractive prospect in the sense that the successful device performance requires high degrees of mechanical flexibility, sensing capability, and user-friendly simplicity. Here, the most up-to-date materials, sensors, and system-packaging technologies to develop advanced WFHE are provided. Details of mechanical, electrical, physicochemical, and biocompatible properties are discussed with integrated sensor applications in healthcare, energy, and environment. In addition, limitations of the current materials are discussed, as well as key challenges and the future direction of WFHE. Collectively, an all-inclusive review of the newly developed WFHE along with a summary of imperative requirements of material properties, sensor capabilities, electronics performance, and skin integrations is provided.

554 citations

Journal ArticleDOI
09 Apr 2019
TL;DR: In this article, the current state of flexible sensor technologies and the impact of material developments on this field are discussed. And special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.
Abstract: Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.

133 citations

Journal ArticleDOI
TL;DR: OFETs are revealed to be one of the best systems for mimicking sensory and nervous systems and their applications in biomimetic systems and future challenges in this research area are provided.
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.

132 citations

Journal ArticleDOI
TL;DR: An overview of conjugated organic semiconductors and their applications in biological sensing with a primary focus on the role of the organic semiconductor is provided in this paper, where the authors cover work carried out with polymers as well as small molecules, from the well-established and commercially available systems to the emerging and recently developed materials.
Abstract: In this review, we provide an overview of conjugated organic semiconductors and their applications in biological sensing with a primary focus on the role of the organic semiconductor. We cover work carried out with polymers as well as small molecules, from the well-established and commercially available systems to the emerging and recently developed materials.

79 citations

Journal ArticleDOI
TL;DR: In this article, the authors thank the ERCStG 2012•306826 eGames project, the Networking Research Center on Bioengineering, Biomaterials, and Nanomedicine (CIBER•BBN), the DGI (Spain) project, FANCY CTQ2016•80030•R, the Generalitat de Catalunya (2017•SGR‐918), and the Spanish Ministry of Economy and Competitiveness, through the “Severo Ochoa” Programme for Centres of Excellence in R
Abstract: The authors thank the ERCStG 2012‐306826 e‐GAMES project, the Networking Research Center on Bioengineering, Biomaterials, and Nanomedicine (CIBER‐BBN), the DGI (Spain) project, FANCY CTQ2016‐80030‐R, the Generalitat de Catalunya (2017‐SGR‐918), and the Spanish Ministry of Economy and Competitiveness, through the “Severo Ochoa” Programme for Centres of Excellence in R&D (SEV‐2015‐0496). F.L. and R.P. gratefully acknowledge the “Juan de la Cierva” programme. The authors thank Dr. Xenofon Strakosas for his help with the TOC image.

78 citations