Correlating Thermionic Emission with Specific Surface Reconstructions in a <100> Hydrogenated Single-Crystal Diamond.
Correlating Thermionic Emission with Specific Surface Reconstructions in a <100> Hydrogenated Single-Crystal Diamond.
复制标题
将 <100> 氢化单晶金刚石中的热电子发射与比表面重建相关联。
DOI：
10.1021/acsami.0c01677
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发表时间：
2020
影响因子：
9.5
通讯作者：
Dominguez-Andrade H
中科院分区：
文献类型：
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作者：
Dominguez-Andrade H
热离子发射依赖于发射材料的通常官能化的表面的低功函数和负电子亲和力。然而，有很少的了解之间的相互作用的电子发射和温度驱动的动态表面转化过程，因为这些都没有表示在传统的Richardson-Dushman方程的电子发射。在这里，我们展示了一个新的模型，可以再现动态表面变化对电子发射的影响，并与发射器表面上的特定表面重构相的电子发射的组成部分。我们使用氢化<100>单晶和多晶金刚石作为电子发射体来验证我们的模型，该模型与实验数据吻合得很好，可以适用于其他发射材料。此外，我们还发现，对C（100）-（2 × 1）：H表面重构的特定结构的覆盖度进行剪裁可以使金刚石的电子发射增加几个数量级。
Thermionic emission relies on the low work function and negative electron affinity of the, often functionalized, surface of the emitting material. However, there is little understanding of the interplay between thermionic emission and temperature-driven dynamic surface transformation processes as these are not represented on the traditional Richardson–Dushman equation for thermionic emission. Here, we show a new model for thermionic emission that can reproduce the effect of dynamic surface changes on the electron emission and correlate the components of the thermionic emission with specific surface reconstruction phases on the surface of the emitter. We use hydrogenated <100> single-crystal and polycrystalline diamonds as thermionic emitters to validate our model, which shows excellent agreement with the experimental data and could be applicable to other emitting materials. Furthermore, we find that tailoring the coverage of specific structures of the C(100)-(2 × 1):H surface reconstruction could increase the thermionic emission of diamond by several orders of magnitude.