scholarly journals Recent Progress in Ohmic/Schottky-Contacted ZnO Nanowire Sensors

2015 ◽  
Vol 2015 ◽  
pp. 1-20 ◽  
Author(s):  
Xiaoli Zhao ◽  
Ranran Zhou ◽  
Qilin Hua ◽  
Lin Dong ◽  
Ruomeng Yu ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Barrier Height ◽  
Flexible Electronics ◽  
Chemical Sensing ◽  
Recent Progress ◽  
Schottky Barrier Height ◽  
Zno Nanowire ◽  
Piezotronic Effect ◽  
Potential Applications ◽  
Nanowire Sensors

We review the recent progress of zinc oxide (ZnO) nanowire sensors with ohmic-contacted and Schottky-contacted configurations and the enhancement of the performances of Schottky-contacted ZnO NW sensors (SCZNSs) by the piezotronic effect. Comparing with the traditional ohmic-contacted ZnO NW sensors (OCZNSs), the SCZNSs have higher sensitivities and faster responses controlled by the barrier height at the metal-semiconductor (M-S) interface. The piezotronic effect was applied to tune the Schottky barrier height (SBH) with the strain-induced piezoelectric polarization charges at the interface of the M-S contact. The piezotronic effect can thus improve the detection limitation, sensitivity, and response time of the SCZNSs in different applications, such as UV detection, gas and bio/chemical sensing. These piezotronic-enhanced SCZNSs may find potential applications in human-machine interfacing and flexible electronics skin technologies.

scholarly journals A Study about Schottky Barrier Height and Ideality Factor in Thin Film Transistors with Metal/Zinc Oxide Nanoparticles Structures Aiming Flexible Electronics Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1188
Author(s):  
Ivan Rodrigo Kaufmann ◽  
Onur Zerey ◽  
Thorsten Meyers ◽  
Julia Reker ◽  
Fábio Vidor ◽  
...  
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Schottky Barrier ◽  
Barrier Height ◽  
Flexible Electronics ◽  
Thin Film Transistors ◽  
Zinc Oxide Nanoparticles ◽  
Schottky Barrier Height ◽  
Oxide Nanoparticles ◽  
Semiconductor Interfaces

Zinc oxide nanoparticles (ZnO NP) used for the channel region in inverted coplanar setup in Thin Film Transistors (TFT) were the focus of this study. The regions between the source electrode and the ZnO NP and the drain electrode were under investigation as they produce a Schottky barrier in metal-semiconductor interfaces. A more general Thermionic emission theory must be evaluated: one that considers both metal/semiconductor interfaces (MSM structures). Aluminum, gold, and nickel were used as metallization layers for source and drain electrodes. An organic-inorganic nanocomposite was used as a gate dielectric. The TFTs transfer and output characteristics curves were extracted, and a numerical computational program was used for fitting the data; hence information about Schottky Barrier Height (SBH) and ideality factors for each TFT could be estimated. The nickel metallization appears with the lowest SBH among the metals investigated. For this metal and for higher drain-to-source voltages, the SBH tended to converge to some value around 0.3 eV. The developed fitting method showed good fitting accuracy even when the metallization produced different SBH in each metal-semiconductor interface, as was the case for gold metallization. The Schottky effect is also present and was studied when the drain-to-source voltages and/or the gate voltage were increased.

Back-gate tuning of Schottky barrier height in graphene/zinc-oxide photodiodes

2013 ◽  
Vol 102 (24) ◽  
pp. 242114 ◽  
Author(s):  
Sejoon Lee ◽  
Youngmin Lee ◽  
Deuk Young Kim ◽  
Emil B. Song ◽  
Sung Min Kim
Keyword(s):  
Zinc Oxide ◽  
Schottky Barrier ◽  
Barrier Height ◽  
Schottky Barrier Height ◽  
Back Gate

scholarly journals Direct-current generators based on conductive polymers for self-powered flexible devices

2021 ◽  
Author(s):  
Yanfang Meng ◽  
Long Zhang ◽  
Guangyuan Xu ◽  
Heling Wang
Keyword(s):  
Schottky Barrier ◽  
Barrier Height ◽  
Direct Current ◽  
Flexible Electronics ◽  
Large Scale ◽  
Schottky Barrier Height ◽  
Conductive Polymers ◽  
Mechanical Stimuli ◽  
Metal Electrodes ◽  
Theoretical Simulation

Abstract Direct-current generators, especially those based on the Schottky contacts between conductive polymers and metal electrodes, are efficient in converting mechanical stimuli into electrical energy. In contrast to triboelectric and piezoelectric generators, direct-current generators readily produce direct-current outputs and high currents that are crucial for integrating multiple energy-harvesting units in large scale and driving some types of devices. We are focusing on the relationship between Schottky barrier height and performance, systematically investigating the effects of various conductive polymers and electrodes on the outputs by both theoretical simulation and experiments. Tailoring the Schottky barrier height between conductive polymers and metal electrodes is demonstrated a significant approach to design the new DC generators. The preparation method of electrochemical deposition endows the generators flexibility, the linear relationship of current/voltage output vs. strain applied on the generators, combined with the large outputs offer advantages for the generator to work as flexible sensors. Furthermore, a mechanosensation-active matrix array based on direct-current generator for the strain monitoring demonstrated its promising prospects in flexible electronics. The direct-current generators with improved performance could serve as a stream new blood for versatile sensory systems and human-machine interactive interfaces.

scholarly journals Direct-current generators based on conductive polymers for self-powered flexible devices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yanfang Meng ◽  
Long Zhang ◽  
Guangyuan Xu ◽  
Heling Wang
Keyword(s):  
Schottky Barrier ◽  
Barrier Height ◽  
Direct Current ◽  
Flexible Electronics ◽  
Large Scale ◽  
Schottky Barrier Height ◽  
Conductive Polymers ◽  
Mechanical Stimuli ◽  
Metal Electrodes ◽  
Theoretical Simulation

AbstractDirect-current generators, especially those based on the Schottky contacts between conductive polymers and metal electrodes, are efficient in converting mechanical stimuli into electrical energy. In contrast to triboelectric and piezoelectric generators, direct-current generators readily produce direct-current outputs and high currents that are crucial for integrating multiple energy-harvesting units in large scale and driving some types of devices. We are focusing on the relationship between Schottky barrier height and performance, systematically investigating the effects of various conductive polymers and electrodes on the outputs by both theoretical simulation and experiments. Tailoring the Schottky barrier height between conductive polymers and metal electrodes is demonstrated a significant approach to design the new DC generators. The preparation method of electrochemical deposition endows the generators flexibility, the linear relationship of current/voltage output vs. strain applied on the generators, combined with the large outputs offer advantages for the generator to work as flexible sensors. Furthermore, a mechanosensation-active matrix array based on direct-current generator for the strain monitoring demonstrated its promising prospects in flexible electronics. The direct-current generators with improved performance could serve as a stream new blood for versatile sensory systems and human–machine interactive interfaces.

scholarly journals Functionalised zinc oxide nanowire gas sensors: Enhanced NO2 gas sensor response by chemical modification of nanowire surfaces

2012 ◽  
Vol 3 ◽  
pp. 368-377 ◽  
Author(s):  
Eric R Waclawik ◽  
Jin Chang ◽  
Andrea Ponzoni ◽  
Isabella Concina ◽  
Dario Zappa ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Gas Sensors ◽  
Zno Nanoparticles ◽  
Zno Nanowires ◽  
Organic Layer ◽  
Zno Nanowire ◽  
Self Assembled Monolayer ◽  
Layer Width ◽  
Zinc Oxide Nanowire ◽  
Nanowire Sensors

Surface coating with an organic self-assembled monolayer (SAM) can enhance surface reactions or the absorption of specific gases and hence improve the response of a metal oxide (MOx) sensor toward particular target gases in the environment. In this study the effect of an adsorbed organic layer on the dynamic response of zinc oxide nanowire gas sensors was investigated. The effect of ZnO surface functionalisation by two different organic molecules, tris(hydroxymethyl)aminomethane (THMA) and dodecanethiol (DT), was studied. The response towards ammonia, nitrous oxide and nitrogen dioxide was investigated for three sensor configurations, namely pure ZnO nanowires, organic-coated ZnO nanowires and ZnO nanowires covered with a sparse layer of organic-coated ZnO nanoparticles. Exposure of the nanowire sensors to the oxidising gas NO2 produced a significant and reproducible response. ZnO and THMA-coated ZnO nanowire sensors both readily detected NO2 down to a concentration in the very low ppm range. Notably, the THMA-coated nanowires consistently displayed a small, enhanced response to NO2 compared to uncoated ZnO nanowire sensors. At the lower concentration levels tested, ZnO nanowire sensors that were coated with THMA-capped ZnO nanoparticles were found to exhibit the greatest enhanced response. ΔR/R was two times greater than that for the as-prepared ZnO nanowire sensors. It is proposed that the ΔR/R enhancement in this case originates from the changes induced in the depletion-layer width of the ZnO nanoparticles that bridge ZnO nanowires resulting from THMA ligand binding to the surface of the particle coating. The heightened response and selectivity to the NO2 target are positive results arising from the coating of these ZnO nanowire sensors with organic-SAM-functionalised ZnO nanoparticles.

Schottky barrier height on thermally oxidized InAlN surface evaluated by electrical and optical measurements

2011 ◽  
Vol 98 (16) ◽  
pp. 162111 ◽  
Author(s):  
J. Kováč ◽  
R. Šramatý ◽  
A. Chvála ◽  
H. Sibboni ◽  
E. Morvan ◽  
...  
Keyword(s):  
Schottky Barrier ◽  
Barrier Height ◽  
Schottky Barrier Height ◽  
Optical Measurements

Effective Schottky Barrier Height Lowering by TiN Capping Layer for TiSix/Si Power Diode

2015 ◽  
Vol 36 (6) ◽  
pp. 597-599 ◽  
Author(s):  
Lin-Lin Wang ◽  
Wu Peng ◽  
Yu-Long Jiang ◽  
Bing-Zong Li
Keyword(s):  
Schottky Barrier ◽  
Barrier Height ◽  
Schottky Barrier Height ◽  
Capping Layer ◽  
Power Diode
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