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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >Thermionic Electron Emission from Nanostructured Diamond
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Thermionic Electron Emission from Nanostructured Diamond

机译：纳米结构金刚石的热电子发射

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摘要

Unique features of electron emission from carbon-based aanostructures are studied to explore direct energy conversion materials and processes. These structures have been shown to produce highly efficient field emission (i.e., high electrical current at low applied fields) for electrical device applications. However, the commensurate transport and conversion of thermal energy has not been previously explored in detail. Understanding these concepts could enable development of devices with efficiencies that exceed those of other direct energy conversion technologies. The electron emission behavior at elevated temperatures, of two diamond-based devices with nanoscale features, is characterized. Bulk current measurements reveal work functions of 1 and 1.3 eV for a boron-doped diamond pyramid array and a phosphorus-doped diamond surface, respectively. An electron energy spectrometer has been designed in order to understand the emission behavior in more detail. The analyzer is integrated with a heat source that enables substrate temperatures up to 1000℃. Spectral measurements indicate higher work functions for both samples.
机译：研究了碳基阳极结构电子发射的独特特征，以探索直接的能量转换材料和过程。这些结构已经显示出产生用于电气设备应用的高效场发射（即，在低施加场下高电流）。但是，以前尚未详细探讨过相应的热能传输和转换。了解这些概念可以使设备开发的效率超过其他直接能量转换技术。表征了两个具有纳米级特征的金刚石基器件在高温下的电子发射行为。大电流测量显示出，掺硼金刚石金字塔阵列和掺磷金刚石表面的功函数分别为1和1.3 eV。为了更详细地了解发射行为，已经设计了电子能谱仪。该分析仪与热源集成在一起，可使基材温度高达1000℃。光谱测量表明两个样品的功函数较高。

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