Limiting factors and efficiencies of narrow bandgap single-absorber and multi-stage interband cascade thermophotovoltaic cells under monochromatic light illumination

2019 ◽  
Vol 126 (4) ◽  
pp. 045714 ◽  
Author(s):  
Wenxiang Huang ◽  
Rui Q. Yang
Keyword(s):  
Monochromatic Light ◽  
Limiting Factors ◽  
Light Illumination ◽  
Multi Stage ◽  
Narrow Bandgap

The Stability of Oxide TFTs under Electrical Gate Bias and Monochromatic Light Illumination

2019 ◽  
Vol 33 (5) ◽  
pp. 313-318 ◽  
Author(s):  
Soo-Yeon Lee ◽  
Sun-Jae Kim ◽  
Young-Wook Lee ◽  
Sang-Geun Park ◽  
Jang-Yeon Kwon ◽  
...  
Keyword(s):  
Monochromatic Light ◽  
Light Illumination ◽  
Gate Bias ◽  
The Stability ◽  
Oxide Tfts

Limiting Factors in Single Stage Centrifugal Superchargers for Aero Engines

1940 ◽  
Vol 44 (358) ◽  
pp. 775-790
Author(s):  
K. Kollman
Keyword(s):  
High Performance ◽  
Single Stage ◽  
Limiting Factors ◽  
General Construction ◽  
Multi Stage ◽  
Aero Engines

To-day all altitudes up to, and including, the stratosphere are within the scope of aviation. The engines must therefore be provided with highly developed superchargers so as to obtain high performance even at these altitudes. The single or multi-stage superchargers necessary to accomplish this become an integral part of the engine and exercise a distinct influence on its general construction.In many types of engine the supercharger is built on to the accessory drive end, that is the rear of the engine, so that the supercharger shaft lies co-axially or parallel with the crankshaft.

scholarly journals Imaging optical scattering of butterfly wing scales with a microscope

2017 ◽  
Vol 7 (4) ◽  
pp. 20170016 ◽  
Author(s):  
Jinxin Fu ◽  
Beom-Jin Yoon ◽  
Jung Ok Park ◽  
Mohan Srinivasarao
Keyword(s):  
Monochromatic Light ◽  
Digital Camera ◽  
Light Illumination ◽  
Butterfly Wing ◽  
Chiral Nematic ◽  
Reflected Light ◽  
Single Lens ◽  
The Individual ◽  
Wing Scales ◽  
Camera Sensor

A new optical method is proposed to investigate the reflectance of structurally coloured objects, such as Morpho butterfly wing scales and cholesteric liquid crystals. Using a reflected-light microscope and a digital single-lens reflex (DSLR) camera, we have successfully measured the two-dimensional reflection pattern of individual wing scales of Morpho butterflies. We demonstrate that this method enables us to measure the bidirectional reflectance distribution function (BRDF). The scattering image observed in the back focal plane of the objective is projected onto the camera sensor by inserting a Bertrand lens in the optical path of the microscope. With monochromatic light illumination, we quantify the angle-dependent reflectance spectra from the wing scales of Morpho rhetenor by retrieving the raw signal from the digital camera sensor. We also demonstrate that the polarization-dependent reflection of individual wing scales is readily observed using this method, using the individual wing scales of Morpho cypris . In an effort to show the generality of the method, we used a chiral nematic fluid to illustrate the angle-dependent reflectance as seen by this method.

scholarly journals Photoresponse of Visible Light Active CM-n-TiO2, HM-n-TiO2, CM-n-Fe2O3, and CM-p-WO3towards Water Splitting Reaction

2012 ◽  
Vol 2012 ◽  
pp. 1-20 ◽  
Author(s):  
Yasser A. Shaban ◽  
Shahed U. M. Khan
Keyword(s):  
Visible Light ◽  
Titanium Oxide ◽  
Water Splitting ◽  
Monochromatic Light ◽  
Visible Region ◽  
Xenon Lamp ◽  
Light Illumination ◽  
X Ray ◽  
Visible Light Active ◽  
Order Of Magnitude

Photoresponses of visible light active carbon modified titanium oxide (CM-n-TiO2), hydrogen modified titanium oxide (HM-n-TiO2), carbon modified iron oxide (CM-n-Fe2O3), carbon modified tungsten oxide (CM-p-WO3) towards water splitting reaction are reported in this article. Carbon and hydrogen in titanium oxide were found to be responsible for red shift from UV region to visible region which in turn enhanced the photoconversion efficiency by an order of magnitude for water splitting reaction. Photocurrent densities and photoconversion efficiencies of regular n-TiO2and CM-n-TiO2towards water splitting reaction under monochromatic light illumination from a xenon lamp and sunlight were compared and found in reasonable agreement. These oxides were characterized by photocurrent measurements,UV-Visspectra, scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS) and x-ray diffraction (XRD) studies and these results are also reported in this article.

scholarly journals Supramolecular engineering of charge transfer in wide bandgap organic semiconductors with enhanced visible-to-NIR photoresponse

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yifan Yao ◽  
Qi Ou ◽  
Kuidong Wang ◽  
Haijun Peng ◽  
Feier Fang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Near Infrared ◽  
Ad Hoc ◽  
Molecular Design ◽  
Monochromatic Light ◽  
Infrared Region ◽  
Wide Bandgap ◽  
Monolayer Graphene ◽  
Infrared Range ◽  
Narrow Bandgap

AbstractOrganic photodetectors displaying efficient photoelectric response in the near-infrared are typically based on narrow bandgap active materials. Unfortunately, the latter require complex molecular design to ensure sufficient light absorption in the near-infrared region. Here, we show a method combining an unconventional device architecture and ad-hoc supramolecular self-assembly to trigger the emergence of opto-electronic properties yielding to remarkably high near-infrared response using a wide bandgap material as active component. Our optimized vertical phototransistors comprising a network of supramolecular nanowires of N,N′-dioctyl-3,4,9,10-perylenedicarboximide sandwiched between a monolayer graphene bottom-contact and Au nanomesh scaffold top-electrode exhibit ultrasensitive light response to monochromatic light from visible to near-infrared range, with photoresponsivity of 2 × 105 A/W and 1 × 102 A/W, at 570 nm and 940 nm, respectively, hence outperforming devices based on narrow bandgap materials. Moreover, these devices also operate as highly sensitive photoplethysmography tool for health monitoring.

Photoluminescence from Porous Silicon Anodized with Monochromatic Light Illumination

1996 ◽  
Vol 452 ◽  
Author(s):  
Takahiro Matsumoto ◽  
Yasuaki Masumoto ◽  
Go Arata ◽  
Hidenori Mimura
Keyword(s):  
Porous Silicon ◽  
Monochromatic Light ◽  
Stokes Shift ◽  
Bandgap Energy ◽  
Clear Correlation ◽  
Light Illumination ◽  
Size Dependent ◽  
Peak Energy ◽  
Points Of View ◽  
The Difference

AbstractThe effect of monochromatic light during the anodization of porous silicon is investigated from the points of view of structural characterization and photoluminescence. A clear correlation is observed between the photoluminescence peak energy and the bandgap energy determined by the illuminating photon energy. The difference of these two energies is analyzed by a size-dependent Stokes shift.

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