Photo-absorption and electron collection of field-assisted GaN nanohole array photocathode

2021 ◽  
Author(s):  
Lei Liu ◽  
Feifei Lu ◽  
Jian Tian ◽  
Xingyue Zhangyang
Keyword(s):  
Nanohole Array ◽  
Electron Collection

scholarly journals Photo-absorption and electron collection of field-assisted GaN nanohole array photocathode

2021 ◽  
Author(s):  
Lei Liu ◽  
Feifei Lu ◽  
Jian Tian ◽  
Xingyue Zhangyang
Keyword(s):  
Light Absorption ◽  
Continuity Equation ◽  
Filling Factor ◽  
Collection Efficiency ◽  
Three Dimensional ◽  
Nanohole Array ◽  
Electron Collection ◽  
Planar Film ◽  
Inclination Angles ◽  
Inclined Angle

Abstract The light absorption and photo-generation rate under different periods, filling factors (FF), hole depth and inclination angles are studied. The NHA exhibits a larger light absorption compared with the planar film, which is about 99.99973%. Based on the three-dimensional continuity equation, the quantum efficiency (QE) and collection efficiency (CE) of the field-assisted GaN NHA and the graded compositional AlGaN NHA are calculated. The QE and CE of the GaN NHA with a period of 200 nm, a filling factor of 0.05, an inclined angle of 10°, and a field intensity of 2 V/µm are 62.7% and 62.6%, respectively. In addition, the graded compositional AlGaN structure has a more improved effect on the vertical NHA. Compared with the uniform GaN NHA, the electron collection of AlGaN NHA ratio is increased by 2.4 times. The design principles proposed in this work provide guidance to reasonable parameters for the application of NHA photocathodes.

Facilitating electron collection of organic photovoltaics by passivating trap states and tailoring work function

Solar Energy ◽  
2019 ◽  
Vol 181 ◽  
pp. 9-16
Author(s):  
Xinyuan Zhang ◽  
Yu Sun ◽  
Mei Wang ◽  
Houxiao Cui ◽  
Wenfa Xie ◽  
...  
Keyword(s):  
Work Function ◽  
Organic Photovoltaics ◽  
Trap States ◽  
Electron Collection

Minority carrier diffusion length determination from capacitance measurements in Se–CdO photovoltaic cells

1991 ◽  
Vol 69 (3-4) ◽  
pp. 538-542 ◽  
Author(s):  
C. H. Champness ◽  
Z. A. Shukri ◽  
C. H. Chan
Keyword(s):  
Substrate Temperature ◽  
Diffusion Length ◽  
Incident Light ◽  
Photovoltaic Cells ◽  
Minority Carrier Diffusion Length ◽  
Electron Collection ◽  
Straight Line ◽  
Current Change ◽  
Length Determination ◽  
Output Capacitance

In Se–CdO photovoltaic cells, the electron diffusion length Ln in the selenium absorber layer has been determined from measurements of capacitance C and photocurrent under monochromatic illumination by variation of applied reverse bias. If penetrating incident light of band-gap wavelength is used, a plot against 1/C of the illuminated-to-dark current change ΔI yields a straight line over a certain range of bias values. Extrapolation of this line to the 1/C axis yields Ln. It was found in the fabrication of the Se–CdO cells that increasing the substrate temperature from 100 to 140 °C during the selenium deposition resulted in an increase in the cell photovoltaic output. Capacitance and ΔI measurements on these cells showed an increase in diffusion length with substrate temperature, indicating that the increased cell performance was due to improved electron collection in the selenium layer.

scholarly journals Plasmonic Sensing Studies of a Gas-Phase Cystic Fibrosis Marker in Moisture Laden Air

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3776
Author(s):  
Libin Sun ◽  
Douglas Conrad ◽  
Drew A. Hall ◽  
Kurt D. Benkstein ◽  
Steve Semancik ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Detection Limit ◽  
Gas Phase ◽  
Localized Surface Plasmon ◽  
Exhaled Breath ◽  
Nanohole Array ◽  
Dry Air ◽  
Plasmonic Sensing ◽  
Sensing Platform ◽  
The Status

A plasmonic sensing platform was developed as a noninvasive method to monitor gas-phase biomarkers related to cystic fibrosis (CF). The nanohole array (NHA) sensing platform is based on localized surface plasmon resonance (LSPR) and offers a rapid data acquisition capability. Among the numerous gas-phase biomarkers that can be used to assess the lung health of CF patients, acetaldehyde was selected for this investigation. Previous research with diverse types of sensing platforms, with materials ranging from metal oxides to 2-D materials, detected gas-phase acetaldehyde with the lowest detection limit at the µmol/mol (parts-per-million (ppm)) level. In contrast, this work presents a plasmonic sensing platform that can approach the nmol/mol (parts-per-billion (ppb)) level, which covers the required concentration range needed to monitor the status of lung infection and find pulmonary exacerbations. During the experimental measurements made by a spectrometer and by a smartphone, the sensing examination was initially performed in a dry air background and then with high relative humidity (RH) as an interferent, which is relevant to exhaled breath. At a room temperature of 23.1 °C, the lowest detection limit for the investigated plasmonic sensing platform under dry air and 72% RH conditions are 250 nmol/mol (ppb) and 1000 nmol/mol (ppb), respectively.

MEASUREMENT OF THE ENERGIES OF α-PARTICLES

1948 ◽  
Vol 26a (4) ◽  
pp. 243-254 ◽  
Author(s):  
T. E. Cranshaw ◽  
J. A. Harvey
Keyword(s):  
Frequency Distribution ◽  
Ionization Energy ◽  
Ionization Chamber ◽  
Experimental Error ◽  
High Stability ◽  
Energy Curve ◽  
Electron Collection ◽  
Linear Amplifier ◽  
Electronic Pulse ◽  
Α Particles

The energies of the α-particles from weak preparations of several new radioactive substances were measured in a grid ionization chamber filled with argon. The accurately known energies of α-particles from several well known sources were used for calibration. The voltage pulses produced by electron collection from the tracks were amplified in a linear amplifier of high stability and converted into flat-topped pulses. An accurately known voltage was subtracted, and the small residual pulses were further amplified. The frequency distribution of pulse sizes was recorded on an electronic pulse analyzer.The final values of the energies are as follows:92U233, 4.823 ± 0.003; 89Ac225, 5.801 ± 0.010; 87Fr221, 6.298 ± 0.010;85At217, 7.023 ± 0.010; 84Po213, 8.336 ± 0.005; and 94Pu239, 5.159 ± 0.005 Mev.The ionization–energy curve in argon was found to be linear within experimental error for α-particles of energy 5 to 9 Mev. Extrapolation of this line determines an intercept of 85 kev. at zero ionization.

Simulation study of a “fission electron-collection” neutron detector

2015 ◽  
Vol 73 ◽  
pp. 46-50 ◽  
Author(s):  
Dong Wang ◽  
Chuanfei Zhang ◽  
Jianhua Zhang
Keyword(s):  
Simulation Study ◽  
Neutron Detector ◽  
Electron Collection
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