Dr. Yijun Zhang Profile

Dr. Yijun Zhang

Dr at Nanjing Univ of Science and Technology

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Author

Publications (28)

Proceedings Article | 30 April 2024 Paper

Study on preparation process and emission performance of AlxGa1-xAs/GaAs photocathodes with distributed Bragg reflector

Cheng Feng, Shuai Cheng, Jian Liu, Yijun Zhang, Yunsheng Qian

Proceedings Volume 13155, 131550A (2024) https://doi.org/10.1117/12.3014282

KEYWORDS: Gallium arsenide, Quantum processes, Quantum efficiency, Photocurrent, Light absorption, Distributed Bragg reflectors

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Proceedings Article | 18 December 2023 Paper

Influence of deformed window glass for GaAs photocathode on light transmission

Xin Guo, Feng Shi, Tiantian Jia, Ruoyu Zhang, Hongchang Cheng, Yijun Zhang

Proceedings Volume 12962, 129620F (2023) https://doi.org/10.1117/12.3007947

KEYWORDS: Gallium arsenide, Modulation transfer functions, Image resolution, Optical surfaces, Zernike polynomials, Windows, Point spread functions, Glasses, Optical transmission, Infrared radiation

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Proceedings Article | 30 November 2023 Poster + Paper

Integrated ultrahigh vacuum facility for photocathode preparation and in-situ characterization

Yijun Zhang, Yunsheng Qian, Junju Zhang, Rongguo Fu, Lei Liu, Yafeng Qiu, Benkang Chang

Proceedings Volume 12796, 127960D (2023) https://doi.org/10.1117/12.2691136

KEYWORDS: Indium gallium arsenide, X-ray photoelectron spectroscopy, Semiconductors, Contamination

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Proceedings Article | 6 November 2023 Paper

Measurement and analysis of surface photovoltage of GaAlN material with multi-layer structrues

Jian Liu, Yijun Zhang, Yunsheng Qian

Proceedings Volume 12921, 1292155 (2023) https://doi.org/10.1117/12.2692022

KEYWORDS: Spectral response, Aluminum, Quantum efficiency, Light absorption, Photocurrent, Surface plasmons, Electric fields, Magnesium, Cesium, Ultraviolet radiation

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Proceedings Article | 8 December 2022 Paper

Investigation of GaAlAs photocathode with nanostructures sensitive to narrow band 532 nm wavelength

Shiman Li, Yijun Zhang, Feng Shi, Gangcheng Jiao, Xin Guo, Ziheng Wang, Kaimin Zhang

Proceedings Volume 12479, 1247902 (2022) https://doi.org/10.1117/12.2657474

KEYWORDS: Nanostructures, Prisms, Gallium, Absorption, Aluminum, Light sources, Nanolithography, Gallium arsenide, Finite-difference time-domain method, Nanostructuring

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Proceedings Article | 27 March 2022 Paper

Improvement of blue green absorption of reflection mode GaAlAs photocathode with different nanostructures

Shiman Li, Yijun Zhang, Feng Shi, Gangcheng Jiao, Ziheng Wang, Kaimin Zhang

Proceedings Volume 12169, 121696L (2022) https://doi.org/10.1117/12.2624811

KEYWORDS: Nanostructures, Absorption, Light sources, Quantum efficiency, Gallium arsenide, Finite-difference time-domain method, Electron transport, Reflection, Light, Interfaces

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Proceedings Article | 7 March 2022 Presentation + Paper

Ultrafast responses of uniform- and gradient-doped GaAs photocathodes: from theory to experiment

Rui Zhou, Hemang Jani, Yijun Zhang, Yunsheng Qian, Lingze Duan

Proceedings Volume 11999, 119990C (2022) https://doi.org/10.1117/12.2607632

KEYWORDS: Gallium arsenide, Doping, Instrument modeling, Diffusion, Reflectivity, Quantum efficiency, Ultrafast phenomena, Picosecond phenomena, Femtosecond phenomena, Semiconductors

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Proceedings Article | 15 February 2022 Paper

Investigation of H+ beam radiation on photoelectric performance of GaAs photocathodes

Kaimin Zhang, Yijun Zhang, Jingzhi Zhang, Shiman Li, Yunsheng Qian, Gangcheng Jiao, Feng Shi, Hongchang Chen, Jinliang Du

Proceedings Volume 12166, 121663L (2022) https://doi.org/10.1117/12.2616828

KEYWORDS: Ions, Gallium arsenide, Chemical species, Ionization, Cesium, Phonons, Optoelectronic devices, Monte Carlo methods, Zinc, Hydrogen

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Proceedings Article | 21 August 2020 Poster + Paper

Ab-initio study of oxygen and carbon contamination on GaAs(100) planar and nanowire photocathode

Kaimin Zhang, Yijun Zhang, Minmin Rong, Zhaoxin Shu, He Zhang, Shan Li, Shiman Li, Jingjing Zhan, Feng Shi, Yanming Zhu

Proceedings Volume 11467, 114672H (2020) https://doi.org/10.1117/12.2567465

KEYWORDS: Chemical species, Nanowires, Adsorption, Absorption, Gallium arsenide, Oxygen, Gallium, Carbon, Contamination

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Proceedings Article | 1 April 2020 Open Access

Application of scanning focused X-ray imaging positioning technique in preparation of GaAs photocathodes

Yijun Zhang, Chengwei Fang, Yunsheng Qian, Junju Zhang, Kaimin Zhang, Jingzhi Zhang, Minmin Rong, Feng Shi, Gangcheng Jiao, Xiaofeng Bai

Proceedings Volume 11367, 113671N (2020) https://doi.org/10.1117/12.2556086

KEYWORDS: Gallium arsenide, Chemical analysis, X-ray imaging, X-rays, Contamination

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Proceedings Article | 27 February 2020 Presentation + Paper

Pump-probe study of ultrafast response of GaAs photocathodes grown by MOCVD and MBE

Hemang Jani, Rui Zhou, Yijun Zhang, Yunsheng Qian, Lingze Duan

Proceedings Volume 11278, 112780R (2020) https://doi.org/10.1117/12.2547350

KEYWORDS: Metalorganic chemical vapor deposition, Diffusion, Gallium arsenide, Reflectivity, Quantum efficiency, Doping, Ultrafast phenomena, Picosecond phenomena, Molecular beam epitaxy, Carrier dynamics, Ultrafast laser spectroscopy

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Proceedings Article | 19 September 2017 Paper

Application of white-light phase-shifting in white-light scanning interferometry

Yujing Wu, Chunkan Tao, Weiyi Wang, Yijun Zhang, Yunsheng Qian

Proceedings Volume 10396, 1039628 (2017) https://doi.org/10.1117/12.2272858

KEYWORDS: Phase interferometry, Interferometry, Phase measurement, Phase shifts, Image processing

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Proceedings Article | 7 September 2017 Paper

Improved performance of GaAs photocathodes using effective activation technique

Yijun Zhang, Jingzhi Zhang, Cheng Feng, Hongchang Cheng, Xiang Zhang, Yunsheng Qian

Proceedings Volume 10404, 104040Y (2017) https://doi.org/10.1117/12.2272958

KEYWORDS: Oxygen, Gallium arsenide, Cesium, Oxides, Image intensifiers

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Proceedings Article | 7 September 2017 Paper

The dual-channel ultraviolet/low light CMOS camera using image fusion technique

Yunsheng Qian, Xiaoyu Zhou, Xiangyu Kong, Yujing Wu, Xiaodong Tang, Yijun Zhang

Proceedings Volume 10393, 103930X (2017) https://doi.org/10.1117/12.2273122

KEYWORDS: Ultraviolet radiation, Image fusion, Detection and tracking algorithms, Visible radiation, Image intensifiers, Ultraviolet detectors, CMOS cameras, Single photon, Fingerprint recognition, Coronagraphy

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Proceedings Article | 29 August 2017 Presentation + Paper

Performance stability of reflection-mode AlGaN photocathode under different preparation methods

Guanghui Hao, Junju Zhang, Yijun Zhang, Yafeng Qiu, Yunsheng Qian

Proceedings Volume 10351, 1035107 (2017) https://doi.org/10.1117/12.2273319

KEYWORDS: Signal attenuation, Sensors, Semiconductors, Photodiodes, Metalorganic chemical vapor deposition, Cesium, Chemical species

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Proceedings Article | 28 April 2017 Paper

Effect of different buffer-layers on near-infrared response of GaAs photocathodes

Yijun Zhang, Cheng Feng, Feng Shi, Xiaohui Wang, Xinxin Liu, Xiang Zhang, Yunsheng Qian

Proceedings Volume 10209, 1020918 (2017) https://doi.org/10.1117/12.2261658

KEYWORDS: Reflectivity, Absorption, Cesium, Crystals, Gallium arsenide, Quantum efficiency, Near infrared, Distributed Bragg reflectors, Molecular beam epitaxy, Superlattices

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Proceedings Article | 30 September 2016 Paper

Multi-station electron scrubbing and performance testing device of large-area MCP

Yun-sheng Qian, LiMing Tang, ChengXin Song, Jian Liu, Cheng Feng, Yijun Zhang

Proceedings Volume 9968, 99680K (2016) https://doi.org/10.1117/12.2238501

KEYWORDS: Microchannel plates, X-ray detectors, X-rays, Gold, Signal processing, Power supplies, Computing systems, Night vision, Control systems, Structural design

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Proceedings Article | 5 November 2015 Paper

Resolution characteristics of graded doping and graded composition reflection-mode AlGaAs/GaAs photocathodes

Wenjuan Deng, Daoli Zhang, Jijun Zou, Xincun Peng, Weilu Wang, Yijun Zhang, Benkang Chang

Proceedings Volume 9795, 97951X (2015) https://doi.org/10.1117/12.2216219

KEYWORDS: Modulation transfer functions, Gallium arsenide, Doping, Aluminum, Quantum efficiency, Spatial frequencies, Interfaces, Diffusion, Analytical research, Electron transport

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Proceedings Article | 13 October 2015 Paper

Test and analysis of spectral response for UV image intensifier

Yunsheng Qian, Jian Liu, Cheng Feng, Yang Lv, Yijun Zhang

Proceedings Volume 9648, 96480M (2015) https://doi.org/10.1117/12.2194434

KEYWORDS: Ultraviolet radiation, Image intensifiers, Optical filters, Quantum efficiency, Image filtering, Signal processing, Solar radiation, Computing systems, Ultraviolet detectors, Signal detection

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Proceedings Article | 24 October 2014 Paper

Theoretical revision of quantum efficiency formula for thin AlGaAs/GaAs photocathodes

Cheng Feng, Yijun Zhang, Yunsheng Qian

Proceedings Volume 9270, 92701F (2014) https://doi.org/10.1117/12.2071392

KEYWORDS: Quantum efficiency, Gallium arsenide, Electrons, Shortwaves, Tellurium, Interfaces, Absorption, Diffusion, Performance modeling, Electron transport

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Proceedings Article | 24 October 2014 Paper

Photoemission behaviors of transmission-mode InGaAs photocathode

Muchun Jin, Benkang Chang, Xinlong Chen, Yijun Zhang, Hongchang Cheng

Proceedings Volume 9270, 92701C (2014) https://doi.org/10.1117/12.2065301

KEYWORDS: Electrons, Indium gallium arsenide, Gallium arsenide, Quantum efficiency, Doping, Cesium, Interfaces, Night vision, Oxygen, Scattering

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Proceedings Article | 18 August 2011 Paper

Photoemission performance of gradient-doping transmission-mode GaAs photocathodes

Yijun Zhang, Jun Niu, Jijun Zou, Yajuan Xiong, Benkang Chang, Junju Zhang, Yujie Du

Proceedings Volume 8194, 81940N (2011) https://doi.org/10.1117/12.898952

KEYWORDS: Gallium arsenide, Cesium, Doping, Diffusion, Quantum efficiency, Interfaces, Electron transport, Oxygen, Absorption, Beryllium

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Proceedings Article | 23 November 2010 Paper

Influence of varied doping structure on the photo-emission of reflection-mode photocathode

Jun Niu, Ge Zhang, Yijun Zhang, Benkang Chang

Proceedings Volume 7847, 78471M (2010) https://doi.org/10.1117/12.868384

KEYWORDS: Doping, Quantum efficiency, Gallium arsenide, Electron transport, Diffusion, Protactinium, Image processing, Dielectrics, Statistical analysis, Germanium

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Proceedings Article | 18 November 2010 Paper

Exponential-doping GaAs NEA photocathode grown by MBE

Junju Zhang, Yijun Zhang, Yujie Du, Biao Li, Xiaoqian Fu, Benkang Chang

Proceedings Volume 7847, 78472Y (2010) https://doi.org/10.1117/12.870665

KEYWORDS: Gallium arsenide, Doping, Electrons, Beryllium, Diffusion, Interfaces, Quantum efficiency, Metalorganic chemical vapor deposition, Sodium, Absorption

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Proceedings Article | 23 October 2010 Paper

Preparation of negative electron affinity gallium nitride photocathode

Jianliang Qiao, Benkang Chang, Yunsheng Qian, Xiaoqing Du, Yijun Zhang, Xiaohui Wang

Proceedings Volume 7658, 76581H (2010) https://doi.org/10.1117/12.864677

KEYWORDS: Gallium nitride, Ultraviolet radiation, Quantum efficiency, Cesium, Vapor phase epitaxy, Metals, Chemical species, Spectroscopy, Organic chemistry, Molecules

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Proceedings Article | 22 October 2010 Paper

Contrast study on GaAs photocathode activation techniques

Jun Niu, Yijun Zhang, Benkang Chang, Zhi Yang, Yajuan Xiong

Proceedings Volume 7658, 765840 (2010) https://doi.org/10.1117/12.864161

KEYWORDS: Cesium, Oxygen, Gallium arsenide, Chemical species, Adsorption, Process modeling, Optoelectronics, Astatine, Zinc, Gallium

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Proceedings Article | 22 October 2010 Paper

Spectral response variation of exponential-doping transmission-mode GaAs photocathodes in the preparation process

Yijun Zhang, Jun Niu, Benkang Chang, Yajuan Xiong, Zhi Yang, Yujie Du

Proceedings Volume 7658, 765841 (2010) https://doi.org/10.1117/12.864180

KEYWORDS: Gallium arsenide, Indium, Quantum efficiency, Doping, Diffusion, Interfaces, Cesium, Beryllium, Electronics engineering, Optoelectronics

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Proceedings Article | 24 September 2009 Paper

Activation and evaluation of GaN photocathodes

Yunsheng Qian, Benkang Chang, Jianliang Qiao, Yijun Zhang, Rongguo Fu, Yafeng Qiu

Proceedings Volume 7481, 74810H (2009) https://doi.org/10.1117/12.830153

KEYWORDS: Gallium nitride, Ultraviolet radiation, Control systems, Quantum efficiency, Cesium, Lamps, Photoemission spectroscopy, Gallium arsenide, Xenon, Monochromators

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Showing 5 of 28 publications

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