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The effect of surface cleaning on quantum efficiency in AlGaN photocathode

机译：表面清洁对AlGaN光电阴极量子效率的影响

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摘要

To improve the quantum efficiency of AlGaN photocathode, various surfaces cleaning techniques for the removal of alumina and carbon from AlGaN photocathode surface were investigated. The atomic compositions of AlGaN photocathode structure and surface were measured by the X-ray photoelectron spectroscopy and Ar+ ion sputtering. It is found that the boiling KOH solution and the mixture of sulfuric acid and hydrogen peroxide, coupled with the thermal cleaning at 850 degrees C can effectively remove the alumina and carbon from the AlGaN photocathode surface. The quantum efficiency of AlGaN photocathode is improved to 35.1% at 240 nm, an increase of 50% over the AlGaN photocathode chemically cleaned by only the mixed solution of sulfuric acid and hydrogen peroxide and thermally cleaned at 710 degrees C. (C) 2014 Elsevier B.V. All rights reserved.
机译：为了提高AlGaN光电阴极的量子效率，研究了用于从AlGaN光电阴极表面去除氧化铝和碳的各种表面清洁技术。通过X射线光电子能谱和Ar +离子溅射来测量AlGaN光电阴极结构和表面的原子组成。发现沸腾的KOH溶液以及硫酸和过氧化氢的混合物，再加上在850℃下的热清洗，可以有效地从AlGaN光电阴极表面除去氧化铝和碳。 AlGaN光电阴极在240 nm处的量子效率提高到35.1％，比仅用硫酸和过氧化氢的混合溶液化学清洁并在710摄氏度下热清洁的AlGaN光电阴极提高了50％。（C）2014 Elsevier BV保留所有权利。

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  • 来源
    《Applied Surface Science》 |2015年第1期|590-593|共4页
  • 作者

    Hao Guanghui; Zhang Yijun; Jin Muchun; Feng Cheng; Chen Xinlong; Chang Benkang;

  • 作者单位

    Nanjing Univ Sci & Technol, Inst Elect Engn & Optoelect Technol, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Inst Elect Engn & Optoelect Technol, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Inst Elect Engn & Optoelect Technol, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Inst Elect Engn & Optoelect Technol, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Inst Elect Engn & Optoelect Technol, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Inst Elect Engn & Optoelect Technol, Nanjing 210094, Jiangsu, Peoples R China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    AlGaN photocathode; Chemical cleaning; Thermal cleaning; Quantum efficiency;

    机译：AlGaN光电阴极;化学清洗;热清洗;量子效率;

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