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首页> 外文期刊>Diamond and Related Materials >Hydrogen termination and electron emission from CVD diamond surfaces: a combined secondary electron emission, photoelectron emission microscopy, photoelectron yield, and field emission study
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Hydrogen termination and electron emission from CVD diamond surfaces: a combined secondary electron emission, photoelectron emission microscopy, photoelectron yield, and field emission study

机译：CVD金刚石表面的氢终止和电子发射：二次电子发射，光电子发射显微镜，光电子产率和场发射研究的组合

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摘要

The effect of hydrogen termination on the electron emission properties of CVD diamond surfaces is investigated. Three kinds of electron emission process, namely secondary electron emission (SEM), photoelectron emission, and field emission are compared on hydrogen free and hydrogen terminated surfaces. Electron beam stimulated desorption was employed to desorb hydrogen from the diamond surface and to pattern H-free areas on otherwise H-covered surfaces. The hydrogen terminated areas give strong electron emission in contrast to the hydrogen free surfaces for all emission processes studied. In particular, the hydrogen free patterns are imaged with comparable contrast by SEM and photoelectron emission microscopy (PEEM). This indicates that the hydrogen termination on diamond surfaces reduces the energy barrier for electron emission by lowering the electron affinity of diamond surface. This is confirmed by a drastic difference in the onset for field emission between the hydrogenated and hydrogen free parts of the same CVD diamond film. It is further demonstrated by yield spectroscopy that the threshold for electron emission below the gap of diamond is lowered by the hydrogenation process.
机译：研究了氢终止对CVD金刚石表面电子发射性能的影响。在无氢和氢封端的表面上比较了三种电子发射过程，即二次电子发射（SEM），光电子发射和场发射。电子束激发的解吸被用来从金刚石表面解吸氢，并图案化否则覆盖氢的表面上的无氢区域。与所研究的所有发射过程中的无氢表面相比，氢封端区域具有较强的电子发射能力。特别地，通过SEM和光电子发射显微镜（PEEM）以无可比拟的对比度对无氢图案进行成像。这表明金刚石表面上的氢封端通过降低金刚石表面的电子亲和力而降低了电子发射的能垒。这可以通过同一CVD金刚石薄膜的氢化部分和无氢部分之间的场发射开始时的巨大差异来证实。通过产率光谱进一步证明，通过氢化过程降低了低于金刚石间隙的电子发射的阈值。

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