scholarly journals Photocurrent response of B12As2 crystals to blue light, and its temperature- dependent electrical characterizations

AIP Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 025206
Author(s):  
R. Gul ◽  
Y. Cui ◽  
A. E. Bolotnikov ◽  
G. S. Camarda ◽  
S. U. Egarievwe ◽  
...  
Keyword(s):  
Blue Light ◽  
Photocurrent Response ◽  
Temperature Dependent ◽  
Electrical Characterizations

Temperature dependent current–voltage curves study of GaN-based blue light-emitting diode

2016 ◽  
Vol 6 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Mingsheng Xu ◽  
Qi Mu ◽  
Longfei Xiao ◽  
Quanbin Zhou ◽  
Hong Wang ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diode ◽  
Temperature Dependent ◽  
Light Emitting ◽  
Current Voltage

scholarly journals Investigation of Forward Tunneling Characteristics of InGaN/GaN Blue Light-Emitting Diodes on Freestanding GaN Detached from a Si Substrate

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 543 ◽  
Author(s):  
Moonsang Lee ◽  
Hyunkyu Lee ◽  
Keun Song ◽  
Jaekyun Kim
Keyword(s):  
Leakage Current ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Forward Bias ◽  
Si Substrate ◽  
Temperature Dependent ◽  
Light Emitting ◽  
Current Voltage ◽  
Current Characteristics ◽  
Recombination Current

We report forward tunneling characteristics of InGaN/GaN blue light emitting diodes (LEDs) on freestanding GaN detached from a Si substrate using temperature-dependent current–voltage (T-I-V) measurements. T-I-V analysis revealed that the conduction mechanism of InGaN/GaN LEDs using the homoepitaxial substrate can be distinguished by tunneling, diffusion and recombination current, and series resistance regimes. Their improved crystal quality, inherited from the nature of homoepitaxy, resulted in suppression of forward leakage current. It was also found that the tunneling via heavy holes in InGaN/GaN LEDs using the homoepitaxial substrate can be the main transport mechanism under low forward bias, consequentially leading to the improved forward leakage current characteristics.

SYNTHESIS AND CHARACTERIZATION OF PURE AND Zn-DOPED SnO2 NANOPOWDERS

2013 ◽  
Vol 22 ◽  
pp. 452-457 ◽  
Author(s):  
PARUL GUPTA ◽  
RISHI VYAS ◽  
B. L. CHOUDHARY ◽  
K. SACHDEV ◽  
D. S. PATIL ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Sensing Applications ◽  
Zn Addition ◽  
Vis Spectroscopy ◽  
Electrical Characterizations

Pure and 4.5 wt% Zn- doped SnO2 nanopowders were synthesized by sol-gel method. These nanopowders were characterized by X- ray diffraction, Scanning electron microscopy, UV-Vis spectroscopy, I-V measurements and R-T measurements. XRD results confirmed the formation of tetragonal rutile type SnO2 with the average crystallite size of 14 ± 1 nm which decreased to 9 ± 1 nm with 4.5 wt% Zn addition. Increase in band gap is observed from UV-Vis spectroscopy. Electrical characterizations revealed increase in resistivity with Zn addition. Temperature dependent resistance measurement showed that both the pure and the Zn- doped samples are suitable for gas sensing applications. A detailed study of these synthesized nanostructured samples is presented and discussed in the paper.

scholarly journals Phototropin perceives temperature based on the lifetime of its photoactivated state

2017 ◽  
Vol 114 (34) ◽  
pp. 9206-9211 ◽  
Author(s):  
Yuta Fujii ◽  
Hiroyuki Tanaka ◽  
Naotake Konno ◽  
Yuka Ogasawara ◽  
Noriko Hamashima ◽  
...  
Keyword(s):  
Blue Light ◽  
Cellular Response ◽  
Biochemical Properties ◽  
Temperature Sensing ◽  
Temperature Dependent ◽  
Temperature Changes ◽  
Sensing Mechanism ◽  
Similar Temperature ◽  
Living Organisms ◽  
Response To Temperature

Living organisms detect changes in temperature using thermosensory molecules. However, these molecules and/or their mechanisms for sensing temperature differ among organisms. To identify thermosensory molecules in plants, we investigated chloroplast positioning in response to temperature changes and identified a blue-light photoreceptor, phototropin, that is an essential regulator of chloroplast positioning. Based on the biochemical properties of phototropin during the cellular response to light and temperature changes, we found that phototropin perceives temperature based on the temperature-dependent lifetime of the photoactivated chromophore. Our findings indicate that phototropin perceives both blue light and temperature and uses this information to arrange the chloroplasts for optimal photosynthesis. Because the photoactivated chromophore of many photoreceptors has a temperature-dependent lifetime, a similar temperature-sensing mechanism likely exists in other organisms. Thus, photoreceptors may have the potential to function as thermoreceptors.

Annealing temperature-dependent crystallinity and photocurrent response of anodic nanoporous iron oxide film

2016 ◽  
Vol 31 (12) ◽  
pp. 1681-1690 ◽  
Author(s):  
Monna Rozana ◽  
Khairunisak Abdul Razak ◽  
Cheong Kuan Yew ◽  
Zainovia Lockman ◽  
Go Kawamura ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Film ◽  
Annealing Temperature ◽  
Photocurrent Response ◽  
Temperature Dependent ◽  
Image Position

Abstract

scholarly journals Effect of The Nickel And Temperature Dependent Electrical Properties C-SiO2 -Ni Composites

2021 ◽  
Author(s):  
S. Gouadria ◽  
K. Omri
Keyword(s):  
Small Polaron ◽  
Sol Gel ◽  
Inert Atmosphere ◽  
Metallic Nickel ◽  
Temperature Dependent ◽  
Conduction Model ◽  
Main Band ◽  
Resorcinol Formaldehyde ◽  
Characteristic Lines ◽  
Electrical Characterizations

Abstract The sol-gel method was chosen to synthesize C-SiO2/Ni nanocomposites, silica nanofillers were incorporated into a carbon based on resorcinol-formaldehyde (RF), doped with 5% nickel. During preparation process, they were subjected to a heat treatment of different pyrolysis temperatures and under an inert atmosphere for 2 h. The X- ray diffractogram presented by XRD of the samples treated at low temperatures, indicates the presence of characteristic lines of metallic nickel. FTIR analysis shows the presence of a main band located at about 1050 cm-1, which corresponds to the vibrations of Si-O-Si. From electrical characterizations, the C-SiO2-Ni5%-650 sample has a negative differential resistance‎ behavior (NDR) at low measurement temperatures. According to the I-V characterization, the C-SiO2-Ni5%-625 °C nanocomposite reveals the NDR behavior at room temperature. The conduction mechanism was fitted by two models: the hopping conduction model for the nanocomposite, treated at 650 °C, and the small polaron model for the composite treated at 675 °C.

A novel device fabricated with Cu2NiSnS4chalcogenide: Morphological and temperature-dependent electrical characterizations

2020 ◽  
Vol 20 (1) ◽  
pp. 58-64 ◽  
Author(s):  
Abdulkerim Karabulut ◽  
Adem Sarilmaz ◽  
Faruk Ozel ◽  
İkram Orak ◽  
Mehmet Akif Şahinkaya
Keyword(s):  
Temperature Dependent ◽  
Novel Device ◽  
Electrical Characterizations

Blue Light Emission from Silicon Ultrafine Particles

1994 ◽  
Vol 351 ◽  
Author(s):  
Shinji Nozaki ◽  
S. Sato ◽  
H. Ono ◽  
H. Morisaki
Keyword(s):  
Blue Light ◽  
Ultrafine Particles ◽  
Radiative Recombination ◽  
Light Emission ◽  
Nonradiative Recombination ◽  
Temperature Dependent ◽  
Blue Light Emission ◽  
Peak Intensity ◽  
Proposed Model ◽  
Recombination Centers

ABSTRACTThe oxygen-containing silicon (Si) ultrafine particles have been deposited onto Si and SiO2 substrates by evaporation of Si powder in an oxygen-containing argon atmosphere. The asdeposited Si ultrafine particles exposed to the ultraviolet light emit blue light, which is strong enough to be seen with the naked eye. The blue light emission is associated with a broad photoluminescence (PL) peak at 2.7 eV, which is attributed to radiative recombination via a radiative recombination center. The proposed model with one radiative and two nonradiative recombination centers well explains the temperature-dependent PL peak intensity.

Light-induced inhibition of sporangial formation of Phytophthora infestans on potato leaves

1975 ◽  
Vol 53 (22) ◽  
pp. 2680-2686 ◽  
Author(s):  
Yigal Cohen ◽  
Helena Eyal ◽  
Tova Sadon
Keyword(s):  
Phytophthora Infestans ◽  
Blue Light ◽  
Red Light ◽  
Continuous Light ◽  
Inhibitory Effect ◽  
Hill Reaction ◽  
Light Conditions ◽  
Temperature Dependent ◽  
Dimethyl Urea ◽  
The Hill

Phytophthora infestans failed to produce sporangia on infected potato leaves under continuous light conditions. Blue light (λmax = 450 nm) was most inhibitory, while red light (λmax = 650 nm) was ineffective in inhibiting sporangial formation. Low intensity of blue light (3.7 μEinstein m−2 s−1) induced about 85% inhibition. The inhibitory effect of blue light upon sporulation was temperature dependent: it increased with rise in the temperature from 10 °C to 25 °C. 3,3,4-Dichlorophenyl-1,1-dimethyl urea (DCMU), which blocks the Hill reaction of photosynthesis, did not enable the fungus to sporulate on leaves under light conditions. Preceding dark treatments did not remove the inhibitory effect of blue light; this suggested that sporulation of the fungus is not a 'dark induction phenomenon.'

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