A review of surface functionalisation of diamond for thermionic emission applications
A review of surface functionalisation of diamond for thermionic emission applications
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DOI：
10.1016/j.carbon.2020.09.019
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发表时间：
2021
期刊：
影响因子：
10.9
通讯作者：
Michael C James;Fabian Fogarty;Ramiz Zulkharnay;N. Fox;P. May
中科院分区：
文献类型：
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作者：
Michael C James;Fabian Fogarty;Ramiz Zulkharnay;N. Fox;P. May
金刚石的表面功能化可以产生负电子亲和势(NEA)，其中导带的能量高于真空水平。众所周知，氢气终端会在钻石上产生近场效应，但在∼700°C以上的温度下就可以去除，这使其不适合钻石基热离子应用，因为在钻石中，高温通过电子发射过程转化为电能。在这篇综述文章中，我们概述了热离子发射，描述了金刚石基热离子能量转换器的潜在应用，然后综述了不同的表面终止方案，这些方案可以为金刚石表面提供NEA。我们讨论了不同的NEA表面作为热电子器件的替代阴极材料的计算和实验发展的相对优点。
Surface functionalisation of diamond can produce negative electron affinity (NEA), where the conduction band lies higher in energy than the vacuum level. Hydrogen termination is well-known to produce NEA on diamond but can be removed by temperatures above ∼700 °C, making it unsuitable for diamond-based thermionic applications, where high temperatures are converted into electricityviaan electron emission process. In this review article we give an overview of thermionic emission, describe the potential applications of diamond-based thermionic energy converters, then review the different surface termination schemes that can provide a diamond surface with NEA. We discuss the relative merits of the different NEA surfaces that have been developed both computationally and experimentally as alternative cathode materials for thermionic devices.