Negative electron affinity of the GaN photocathode: a review on the basic theory, structure design, fabrication, and performance characterization.

2021 ◽  
Vol 9 (38) ◽  
pp. 13013-13040
Author(s):  
Xiaohui Wang ◽  
Mengbo Wang ◽  
Yulong Liao ◽  
Lifeng Yang ◽  
Qipei Ban ◽  
...  
Keyword(s):  
Electron Affinity ◽  
Structure Design ◽  
Basic Theory ◽  
Negative Electron Affinity ◽  
Performance Characterization ◽  
Comprehensive Review ◽  
Theory Structure ◽  
And Performance

A comprehensive review is provided on the basic theory, structure design, fabrication, and performance characterization of the NEA GaN photocathode.

Negative Electron Affinity AlGaAs/GaAs Photocathodes with Exponential-Doping Structure

2013 ◽  
Vol 631-632 ◽  
pp. 160-166
Author(s):  
Yi Jun Zhang ◽  
Jing Zhao ◽  
Ji Jun Zou ◽  
Jun Niu ◽  
Ben Kang Chang
Keyword(s):  
Electron Affinity ◽  
Structure Design ◽  
Growth Surface ◽  
Negative Electron Affinity ◽  
High Quantum Yield ◽  
Band Engineering ◽  
Industrial Manufacturing ◽  
And Performance ◽  
Experimental Researches

Obtaining photocathodes with high quantum yield has been the focus during the process of photocathode development. With the limitation of basic industrial manufacturing level, the further performance improvement of the negative electron affinity photocathode is subject to the quality of grown material itself. For this reason, according to the band engineering science, we have proposed an exponential-doping structure applied to the active-layer of reflection-mode and transmission-mode AlGaAs/GaAs photocathodes via molecular beam epitaxy technique, to increase the photocathode emission efficiency. A series of theoretical and experimental researches including structure design, material growth, surface cleanness, Cs-O activation and performance evaluation have been carried out to confirm the actual effect of exponential-doping photocathodes. As a result of the built-in electric field, the cathode performance was enhanced for exponential-doping AlGaAs/GaAs photocathodes.

Design, Installation, and Performance Characterization of a Laboratory-Scale Solar Thermal System for Experiments in Solar Energy Utilization

2012 ◽  
Author(s):  
Stephanie Drozek ◽  
Christopher Damm ◽  
Ryan Enot ◽  
Andrew Hjortland ◽  
Brandon Jackson ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Laboratory Scale ◽  
Energy Utilization ◽  
Solar Thermal ◽  
Thermal System ◽  
Performance Characterization ◽  
And Performance ◽  
Solar Thermal System

The purpose of this paper is to describe the implementation of a laboratory-scale solar thermal system for the Renewable Energy Systems Laboratory at the Milwaukee School of Engineering (MSOE). The system development began as a student senior design project where students designed and fabricated a laboratory-scale solar thermal system to complement an existing commercial solar energy system on campus. The solar thermal system is designed specifically for educating engineers. This laboratory equipment, including a solar light simulator, allows for variation of operating parameters to investigate their impact on system performance. The equipment will be utilized in two courses: Applied Thermodynamics, and Renewable Energy Utilization. During the solar thermal laboratories performed in these courses, students conduct experiments based on the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) 93-2010 standard for testing and performance characterization of solar thermal systems. Their measurements are then used to quantify energy output, efficiency and losses of the system and subsystem components.

Fabrication and performance characterization of the membrane from self-dispersed gelatin-coupled cellulose microgels

Cellulose ◽  
2019 ◽  
Vol 26 (5) ◽  
pp. 3255-3269 ◽  
Author(s):  
Yijun Yao ◽  
Hongru Wang ◽  
Ruirui Wang ◽  
Yong Chai ◽  
Wanli Ji
Keyword(s):  
Performance Characterization ◽  
And Performance
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