Electronic Memory Effects in Zinc Oxide Nanoparticle -Polystyrene Devices with a Calcium Top Electrode

2006 ◽  
Vol 965 ◽  
Author(s):  
Frank Verbakel ◽  
Stefan C. J. Meskers ◽  
René A. J. Janssen
Keyword(s):  
Zinc Oxide ◽  
Uv Light ◽  
Metal Electrode ◽  
Electrochemical Process ◽  
Memory Effects ◽  
Current Voltage ◽  
Positive Voltage ◽  
Current Voltage Characteristics ◽  
Oxide Nanoparticle ◽  
Diode Behavior

ABSTRACTDiodes with an active layer of solution processed zinc oxide (ZnO) nanoparticles and polystyrene are studied. Poly(3,4-ethylenedioxythiophene)- polystyrenesulfonate (PEDOT:PSS) on indium doped tin oxide (ITO) is used as the bottom electrode and aluminum or calcium are used as top electrode. Pristine devices show diode behavior in their current-voltage characteristics. The conductivity of the device in reverse bias can be raised three orders of magnitude by applying a positive voltage or by illumination with UV light. In this high conductivity state we observe reversible electronic memory effects. The electronic memory effects are attributed to a reversible electrochemical process at the PEDOT:PSS/ZnO interface. Memory effects in diodes with Al and Ca metal electrode are found to be very similar, consistent with the view that the memory effects arise at the PEDOT:PSS/ZnO interface.

Optimization of zinc oxide nanoparticle-catalyzed in vitro bilirubin photolysis and in vivo treatment of hyperbilirubinemia

Nanomedicine ◽  
2021 ◽  
Author(s):  
Haq Nawaz ◽  
Iqra Naseem ◽  
Tanzila Rehman ◽  
Mubashir Nawaz
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Uv Light ◽  
Uv Exposure ◽  
Uv Treatment ◽  
Blood Samples ◽  
Positive Effects ◽  
Oxide Nanoparticle

Aim: To optimize the Zinc oxide nanoparticles (ZnONPs)-catalyzed in vitro photolysis of bilirubin and to test their effect on bilirubin clearance in vivo. Materials & methods: ZnONPs, synthesized in an alkaline medium, were characterized. Response surface methodology was used to optimize the in vitro photolysis catalyzed by the nanoparticles (NPs). Blood samples from phenylhydrazine-induced hyperbilirubinemic rabbits which had been administered ZnONPs and UV light were analyzed to assess in vivo clearance of bilirubin. Results: The ZnONP-assisted UV treatment showed the linear and quadratic positive effects on the in vitro bilirubin photolysis with an optimal photolysis of bilirubin at 225 mg dl-1 concentration of ZnONPs and a UV exposure of 1.80 h. The ZnONP-assisted phototherapy of hyperbilirubinemic animals was also found to be more effective for in vivo clearance of bilirubin than phototherapy alone. Conclusion: After further trials, ZnONP-assisted phototherapy could be a potential treatment for hyperbilirubinemia in humans.

Effect of deep-level states on current-voltage characteristics and electroluminescence of blue and UV light-emitting diodes

2010 ◽  
Vol 207 (6) ◽  
pp. 1489-1496 ◽  
Author(s):  
R. Nana ◽  
P. Gnanachchelvi ◽  
M. A. Awaah ◽  
M. H. Gowda ◽  
A. M. Kamto ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Deep Level ◽  
Uv Light ◽  
Light Emitting ◽  
Current Voltage ◽  
Current Voltage Characteristics

Metastable Variations of the Fill Factor in CIGS Thin Film Solar Cells

2009 ◽  
Vol 1165 ◽  
Author(s):  
Aleksander Urbaniak ◽  
Małgorzata Igalson
Keyword(s):  
Fill Factor ◽  
Elevated Temperatures ◽  
Reverse Voltage ◽  
Cell Behaviors ◽  
Cigs Thin Film ◽  
Current Voltage ◽  
Shallow Acceptors ◽  
Current Voltage Characteristics ◽  
Diode Behavior ◽  
Kinetics Of

AbstractWe investigate the origin of fill factor changes induced by reverse bias treatment. Evolution of current-voltage characteristics have been measured during application of reverse voltage bias. Two different cell behaviors have been identified. At elevated temperatures one kind of the devices strongly deteriorates and exhibit so called double diode behavior. On the other hand, in the same conditions another cells keep their fill factor almost constant. We correlate the fill factor changes with the kinetics of capacitance and show that although increased number of shallow acceptors itself cannot induce this severe FF deterioration, it may strongly influence position of the Fermi level at the heterointerface that in a presence of an electron barrier is crucial for the device behavior.

Current-Voltage Characteristics of Cobalt-Doped Inversion Boundaries in Zinc Oxide Bicrystals

2003 ◽  
Vol 86 (9) ◽  
pp. 1616-1618 ◽  
Author(s):  
Fumiyasu Oba ◽  
Yukio Sato ◽  
Takahisa Yamamoto ◽  
Yuichi Ikuhara ◽  
Taketo Sakuma
Keyword(s):  
Zinc Oxide ◽  
Current Voltage ◽  
Current Voltage Characteristics

scholarly journals Electronic memory effects in diodes from a zinc oxide nanoparticle-polystyrene hybrid material

2006 ◽  
Vol 89 (10) ◽  
pp. 102103 ◽  
Author(s):  
Frank Verbakel ◽  
Stefan C. J. Meskers ◽  
René A. J. Janssen
Keyword(s):  
Zinc Oxide ◽  
Hybrid Material ◽  
Memory Effects ◽  
Zinc Oxide Nanoparticle ◽  
Oxide Nanoparticle

scholarly journals Study of the Electrophysical Properties of Composite Varistors Based on Zinc Oxide and Polymer (Polyaniline)

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Sajedeh Mohammadi Aref ◽  
Hassan Bidadi ◽  
Shamestan Hasanli
Keyword(s):  
Activation Energy ◽  
Zinc Oxide ◽  
Temperature Dependence ◽  
Experimental Work ◽  
Threshold Voltage ◽  
Nonlinear Behavior ◽  
Polymer Content ◽  
Electrophysical Properties ◽  
Current Voltage ◽  
Current Voltage Characteristics

In this experimental work, current-voltage characteristics of composite varisrors prepared on the base of zinc oxide with different weight percentages of polyaniline and temperature dependence of the samples characteristics have been studied. The activation energy of donor levels as well as the existence of hysteresis loop has been investigated. The comparison of experimental results shows that by increasing the polymer percentage in the varistor structure as long as the nonlinear behavior is conserved, the threshold voltage increases. This comparison also indicates that increasing the polymer content in the varistor structure causes the temperature dependence of threshold voltage to decrease. It is also concluded that, by the increase of polymer content in the varistor structure, the activation energy of donor levels and the hysteresis value are increased.

scholarly journals Zinc oxide-paper based sensor for photoconductive ultraviolet detection

2020 ◽  
Vol 20 (1) ◽  
pp. 60
Author(s):  
Mohammad Shafiq Che Soh ◽  
Mastura Shafinaz Zainal Abidin ◽  
Shaharin Fadzli Abd Rahman ◽  
Shuthish Elangkovan ◽  
Ahmad Bukhairi Md Rashid
Keyword(s):  
Zinc Oxide ◽  
Uv Light ◽  
Low Cost ◽  
New Technology ◽  
Ultraviolet Detection ◽  
Food Quality Control ◽  
Whatman Filter Paper ◽  
Current Voltage ◽  
Printing Paper ◽  
Paper Sensor

Paper based sensor is the new technology to fabricate a simple, portable, and low cost device that exhibits the comparable properties and functions with those fabricated using complex fabrication process. Paper based sensor is usually applied in environmental monitoring, health diagnostics, and food quality control.  This research is focusing on the paper based sensor that will contribute to the development of Ultraviolet (UV) sensor. The fabrication of the sensor was done by using different grade of pencil, namely 6B and 2B on different type of paper. The different grade of pencil corresponds to different percentage of graphite and clay. As for the type of paper, A4 printing paper and Whatman filter paper were used. UV sensing operation was analyzed from the measurement of current-voltage (I-V) characteristics under the exposure of UV light. Zinc oxide (ZnO) was coated on the sensor to facilitate the detection in the presence of UV. The sample fabricated using 6B pencil grade on A4 printing paper and with ZnO coating showed a better UV sensing performance compared to other samples. This is due to the high conduction of 6B pencil grade and smooth surface of A4 printing paper. The ZnO coating increased the sensor sensitivity and response towards the UV light. These findings provide valuable information which can be used in fabricating a low-cost and simple UV paper sensor.

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