Stabilisation of Hg1-xCdxTe:Hg1-yCdyTex ≠ y) Heterointerfaces and Applications in Infra Red Devices

1990 ◽  
Vol 216 ◽  
Author(s):  
Paul A. Clifton ◽  
Paul D. Brown
Keyword(s):  
Barrier Layer ◽  
Epitaxial Layers ◽  
Long Wavelength ◽  
Long Term Stability ◽  
Novel Approach ◽  
Infra Red ◽  
Passivation Layers ◽  
Cdte Buffer ◽  
Initial Results

ABSTRACTThe interface between Hg1-xCdxTe(0 ≦ x ≦ 1) and Hg1-yCdyTe(0 ≦ y ≦ 1) epitaxial layers of different composition (x ≠ y) is unstable with regard to the intermixing of the Hg and Cd cations within the Group II sublattice. This phenomenon may give rise to long-term stability problems in HgTe-(Hg,Cd)Te superlattices and composition grading between (Hg,Cd)Te absorber layers and CdTe buffer or passivation layers in epitaxial infra red detectors. In this paper, a novel approach to the inhibition of interdiffusion in these systems is discussed. This involves the growth of an intervening ZnTe barrier layer at the heterointerface between two (Hg,Cd)Te layers. Initial results are presented which indicate the effectiveness of this technique in reducing interdiffusion in an experimental heterostructure grown by MOVPE. Some possible applications in a variety of HgTe-based long wavelength devices are discussed.

Long-term stability of long-wavelength (>1.25 µm) quantum-dot lasers fabricated on GaAs substrates

2003 ◽  
Vol 48 (1) ◽  
pp. 131-132 ◽  
Author(s):  
E. Yu. Lundina ◽  
Yu. M. Shernyakov ◽  
M. V. Maksimov ◽  
I. N. Kayander ◽  
A. F. Tsatsul’nikov ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Dot Lasers ◽  
Long Wavelength ◽  
Term Stability ◽  
Long Term Stability ◽  
Gaas Substrates

Investigating the degradation behaviours of n+-doped Poly-Si passivation layers: An outlook on long-term stability and accelerated recovery

2021 ◽  
pp. 111491
Author(s):  
Daniel Chen ◽  
Chukwuka Madumelu ◽  
Moonyong Kim ◽  
Bruno Vicari Stefani ◽  
Anastasia Soeriyadi ◽  
...  
Keyword(s):  
Term Stability ◽  
Long Term Stability ◽  
Passivation Layers

scholarly journals A limiting Current Oxygen Sensor Constituted of (CeO2)0.95(Y2O3)0.05 as Solid Electrolyte Layer and (CeO2)0.75(ZrO2)0.25 as Dense Diffusion Barrier Layer

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3511
Author(s):  
Wang ◽  
Liu ◽  
Yu
Keyword(s):  
Solid Electrolyte ◽  
Oxygen Concentration ◽  
Barrier Layer ◽  
Diffusion Barrier ◽  
Oxygen Sensor ◽  
Limiting Current ◽  
Long Term Stability ◽  
Diffusion Barrier Layer ◽  
Sensing Characteristics

Using the co-precipitation method to synthesize (CeO2)0.95(Y2O3)0.05 (YDC) and solidreaction method to synthesize (CeO2)0.75(ZrO2)0.25 (ZDC), and the crystal structure, micro-structure,total conductivity and electronic conductivity of the two materials was measured with X-raydiffraction (XRD), scanning electron microscope (SEM), DC van der Pauw and Hebb-Wagnermethods. A limiting current oxygen sensor was prepared with YDC solid electrolyte and a ZDCdense diffusion barrier layer by employing platinum pasting bonding. Sensing characteristics ofthe sensor were obtained at different conditions, including temperature (T), oxygen concentration(x(O2)) and water vapor pressure (p(H2O)), and the influence of various conditions on sensingperformance was studied. The long-term stability of the sensor was measured in an oxygen concentration of 1.2% and at a temperature of 800 °C for 120 h. XRD results show that the phase structure of both YDC and ZDC belongs to the cubic phase. SEM results show that both YDC and ZDC layers are dense layers, which are then qualified to be the composition materials of the sensor. The limiting current (IL) of the sensor is obtained and the sensor exhibits good sensing characteristics to satisfy the Knudsen model. Log(IL·T) depends linearly on 1000/T with a squared correlation coefficient (R2) of 0.9904; IL depends linearly on x(O2) with an R2 of 0.9726; and sensing characteristics are not affected by p(H2O). It was found that the oxygen sensor has good long-term stability.

The Flexible Microtube Plasma as Post-Ionization Source for Cholesterol in nano-Electrospray Mass Spectrometry

2021 ◽  
Author(s):  
Daniel Foest ◽  
Alexander Knodel ◽  
Robert Ahrends ◽  
Cristina Coman ◽  
Joachim Franzke ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Dynamic Range ◽  
Standard Addition ◽  
Polar Compounds ◽  
Ionization Mass ◽  
Ionization Source ◽  
Long Term Stability ◽  
Novel Approach

Cholesterol serves as a biomarker in clinical- and life-sciences. The determination of abnormal levels can indicate several types of human diseases. However, the low polarity of free cholesterol makes it hardly accessible by (nano) electrospray ionization mass spectrometry (nESI-MS). As novel approach, the flexible microtube plasma (FμTP) for post-ionization allows the determination of low-polar compounds like cholesterol in combination with nESI-MS. Focusing on the analytical performance, the activated post-ionization leads to an increased cholesterol signal by a factor of 22. The repeatability and long-term stability could be successful evaluated by using a complex liver extract. Via the method of standard addition, a linear dynamic range of 1.7 orders of magnitude, a minimum detectability of 3.71 mg/L and a high accuracy (deviation: − 8.11 %) is demonstrated proofing the FμTP-nESI-MS as an excellent approach for a derivatization-free determination of cholesterol without the necessity of high-resolution Orbitrap devices or enhanced MS acquisition-methods.

A novel monochromator for experiments with ultrashort X-ray pulses

2013 ◽  
Vol 20 (4) ◽  
pp. 522-530 ◽  
Author(s):  
Maria Brzhezinskaya ◽  
Alexander Firsov ◽  
Karsten Holldack ◽  
Torsten Kachel ◽  
Rolf Mitzner ◽  
...  
Keyword(s):  
Optical Excitation ◽  
Photon Flux ◽  
Excitation Wavelength ◽  
Optical Pump ◽  
Optical Components ◽  
X Ray ◽  
Long Term Stability ◽  
New Class ◽  
Novel Approach

Aiming at advancing storage-ring-based ultrafast X-ray science, over the past few years many upgrades have been undertaken to continue improving beamline performance and photon flux at the Femtoslicing facility at BESSY II. In this article the particular design upgrade of one of the key optical components, the zone-plate monochromator (ZPM) beamline, is reported. The beamline is devoted to optical pump/soft X-ray probe applications with 100 fs (FWHM) X-ray pulses in the soft X-ray range at variable polarization. A novel approach consisting of an array of nine off-axis reflection zone plates is used for a gapless coverage of the spectral range between 410 and 1333 eV at a designed resolution ofE/ΔE= 500 and a pulse elongation of only 30 fs. With the upgrade of the ZPM the following was achieved: a smaller focus, an improved spectral resolution and bandwidth as well as excellent long-term stability. The beamline will enable a new class of ultrafast applications with variable optical excitation wavelength and variable polarization.

How do different surface modification strategies affect the properties of MnO nanoparticles for biomedical applications? Comparison of PEGylated and SiO2-coated MnO nanoparticles

2011 ◽  
Vol 1355 ◽  
Author(s):  
Thomas D. Schladt ◽  
Kerstin Koll ◽  
Heiko Bauer ◽  
Stefan Weber ◽  
Laura M. Schreiber ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Biomedical Applications ◽  
Silica Shell ◽  
Longitudinal Relaxation Time ◽  
Poly Ethylene Glycol ◽  
Cytotoxic Potential ◽  
Long Term Stability ◽  
Novel Approach ◽  
Poly Ethylene

ABSTRACTMnO nanoparticles (NPs) were surface functionalized by two different approaches, (1) using a dopamine-poly(ethylene glycol) (PEG) (DA-PEG) ligand and (2) by encapsulation within a thin silica shell applying a novel approach. Both MnO@DA-PEG and MnO@SiO2 NPs exhibited excellent long-term stability in physiological solutions. In addition, the cytotoxic potential of both materials was comparatively low. Furthermore, owing to the magnetic properties of MnO NPs, both MnO@DA-PEG and MnO@SiO2 lead to a shortening of the longitudinal relaxation time T1 in MRI. In comparison to the PEGylated MnO NPs, the presence of a thin silica shell led to a greater stability of the MnO core itself by preventing excessive Mn ion leaching into aqueous solution.

Stability and Change in Emotional Intelligence: Exploring the Transition to Young Adulthood

2005 ◽  
Vol 26 (2) ◽  
pp. 100-106 ◽  
Author(s):  
James D.A. Parker ◽  
Donald H. Saklofske ◽  
Laura M. Wood ◽  
Jennifer M. Eastabrook ◽  
Robyn N. Taylor
Keyword(s):  
High School ◽  
Emotional Intelligence ◽  
Postsecondary Education ◽  
Life Transition ◽  
Full Time ◽  
Major Life ◽  
Long Term Stability ◽  
Time Period ◽  
Transition From High School

Abstract. The concept of emotional intelligence (EI) has attracted growing interest from researchers working in various fields. The present study examined the long-term stability (32 months) of EI-related abilities over the course of a major life transition (the transition from high school to university). During the first week of full-time study, a large group of undergraduates completed the EQ-i:Short; 32 months later a random subset of these students (N = 238), who had started their postsecondary education within 24 months of graduating from high school, completed the measures for a second time. The study found EI scores to be relatively stable over the 32-month time period. EI scores were also found to be significantly higher at Time 2; the overall pattern of change in EI-levels was more than can be attributed to the increased age of the participants.

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