scholarly journals High-efficiency optical pumping of nuclear polarization in a GaAs quantum well

2017 ◽  
Vol 96 (20) ◽  
Author(s):  
R. W. Mocek ◽  
V. L. Korenev ◽  
M. Bayer ◽  
M. Kotur ◽  
R. I. Dzhioev ◽  
...  
Keyword(s):  
Quantum Well ◽  
Nuclear Polarization ◽  
Optical Pumping ◽  
High Efficiency

scholarly journals Experimental and Modeling Study on the High-Performance p++-GaAs/n++-GaAs Tunnel Junctions with Silicon and Tellurium Co-Doped InGaAs Quantum Well Inserted

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1092
Author(s):  
Yudan Gou ◽  
Jun Wang ◽  
Yang Cheng ◽  
Yintao Guo ◽  
Xiao Xiao ◽  
...  
Keyword(s):  
Quantum Well ◽  
High Performance ◽  
High Efficiency ◽  
Tunnel Junctions ◽  
Peak Current Density ◽  
Co Doping ◽  
Trap Assisted Tunneling ◽  
Carrier Tunneling ◽  
High Concentrations ◽  
Ingaas Quantum Well

The development of high-performance tunnel junctions is critical for achieving high efficiency in multi-junction solar cells (MJSC) that can operate at high concentrations. We investigate silicon and tellurium co-doping of InGaAs quantum well inserts in p++-GaAs/n++-GaAs tunnel junctions and report a peak current density as high as 5839 A cm−2 with a series resistance of 5.86 × 10−5 Ω cm2. In addition, we discuss how device performance is affected by the growth temperature, thickness, and V/III ratio in the InGaAs layer. A simulation model indicates that the contribution of trap-assisted tunneling enhances carrier tunneling.

Optical pumping of IV-VI semiconductor multiple quantum well materials using a GaSb-based laser with emission at λ=2.5μm

2005 ◽  
Vol 97 (5) ◽  
pp. 053103 ◽  
Author(s):  
P. J. McCann ◽  
P. Kamat ◽  
Y. Li ◽  
A. Sow ◽  
H. Z. Wu ◽  
...  
Keyword(s):  
Quantum Well ◽  
Optical Pumping ◽  
Multiple Quantum Well ◽  
Multiple Quantum

Bilayered Two-Dimensional Hybrid Perovskite with the Cage-Templated Secondary Cation for High Efficiency Photodetection

2022 ◽  
Author(s):  
liwei tang ◽  
Huaixi Chen ◽  
Yu Ma ◽  
Yi Liu ◽  
lina Hua ◽  
...  
Keyword(s):  
Quantum Well ◽  
High Efficiency ◽  
Two Dimensional ◽  
Quantum Well Structures ◽  
Hybrid Perovskite

Two-dimensional (2D) multilayered hybrid perovskites adopting the intrinsic quantum-well structures have shown great application potentials in the field of optoelectronics. Despite extensive studies, the candidate perovskites composed of the cage-templated...

Epitaxial Reflector Structures for High Efficiency Quantum Well Solar Cells

2019 ◽  
Author(s):  
Roger E. Welser ◽  
Stephen J. Polly ◽  
Ashok K. Sood ◽  
Seth M. Hubbard ◽  
Kyle H. Montgomery
Keyword(s):  
Solar Cells ◽  
Quantum Well ◽  
High Efficiency

High-Power Low-Threshold Optically Pumped Type-ll Quantum-Well Lasers

1997 ◽  
Vol 484 ◽  
Author(s):  
Chih-Hsiang Lin ◽  
S. J. Murry ◽  
Rui Q. Yang ◽  
S. S. Pei ◽  
H. Q. Le ◽  
...  
Keyword(s):  
Quantum Well ◽  
Output Power ◽  
Optical Pumping ◽  
Internal Quantum Efficiency ◽  
Characteristic Temperature ◽  
Stimulated Emission ◽  
Free Carrier Absorption ◽  
Type Ii ◽  
Optically Pumped ◽  
Internal Loss

AbstractStimulated emission in InAs/InGaSb/InAs/AlSb type-II quantum-well (QW) lasers was observed up to room temperature at 4.5 μm, optically pumped by a pulsed 2-μm Tm:YAG laser. The absorbed threshold peak pump intensity was only 1.1 kW/cm2 at 300 K, with a characteristic temperature T0 of 61.6 K for temperatures up to 300 K. We will also study the effects of internal loss on the efficiency and output power for type-II QW lasers via optical pumping. Using a 0.98-μm InGaAs linear diode array, the devices exhibited an internal quantum efficiency of 67% at temperatures up to 190 K, and was capable of < 1. 1-W peak output power per facet in 6-μs pulses at 85 K. The internal loss of the devices exhibited an increase from 18 cm−1 near 70 K to ∼ 60–100 cm−1 near 180 K, which was possibly due to inter-valence band free carrier absorption.

SABRE Hyperpolarization of Bipyridine Stabilized Ir-Complex at High, Low and Ultralow Magnetic Fields

2017 ◽  
Vol 231 (3) ◽  
Author(s):  
Andrey N. Pravdivtsev
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Dynamic Nuclear Polarization ◽  
Signal Amplification ◽  
Nuclear Polarization ◽  
Optical Pumping ◽  
Spin Exchange ◽  
Spin Exchange Optical Pumping ◽  
Wide Range

AbstractA strong limitation of nuclear magnetic resonance is its low inherent sensitivity that can be overcome by using an appropriate hyperpolarization technique. Presently, dynamic nuclear polarization and spin-exchange optical pumping are the only hyperpolarization techniques that are used in applied medicine. However, both are relatively complex in use and expensive. Here we present a modification of the signal amplification by reversible exchange (SABRE) hyperpolarization method – SABRE on stabilized Ir-complexes. A stabilized Ir-complex (here we used bipyridine for stabilization) can be hyperpolarized in a wide range of magnetic fields from a few μT upto 10 T with

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