期刊
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
卷 27, 期 3, 页码 1132-1141出版社
A V S AMER INST PHYSICS
DOI: 10.1116/1.3125282
关键词
diamond; nitrogen; Poisson equation; space-charge-limited conduction; thermionic conversion; thermionic electron emission; Vlasov equation
A theory of the space charge limited output current regime of a vacuum thermionic energy conversion device (TEC) employing a negative electron affinity (NEA) diamond emitter electrode is derived. The theory is developed by assuming that the electrons behave as a collisionless gas and self-consistently solving Vlaslov's equation and Poisson's equation. Special cases of the theory are addressed. Calculations are performed to model a TEC with a nitrogen doped diamond emitter material under various conditions. It is shown that the NEA material outperforms a similar positive electron affinity material in terms of output power and efficiency because the NEA lowers the electrostatic boundary condition at the emitter and therefore mitigates the negative space charge effect.
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