Combined visible light photo-emission and low temperature thermionic emission from nitrogen doped diamond films

Tianyin Sun, Franz A M Koeck, Chiyu Zhu, Robert Nemanich

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This study reports a photoemission threshold of ∼1.5 eV from nitrogen-doped nanocrystalline diamond, which ranks among the lowest photo-threshold of any non-cesiated material. Diamond films on molybdenum substrates have been illuminated with light from 340 to 550 nm, and the electron emission spectrum has been recorded from ambient to ∼320 C. The results display combined thermionic and photo-electron emission limited by the same low work function and indicate that the two emission processes are spatially separated. These results indicate the potential for a solar energy conversion structure that takes advantage of both photoemission and thermionic emission.

Original languageEnglish (US)
Article number202101
JournalApplied Physics Letters
Issue number20
StatePublished - Nov 14 2011


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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