Decrease of electron paramagnetic defect density and enhancement of electron field emission in annealed carbon films

Yun Hi Lee, Dong Ho Kim, Yoon Taek Jang, Byeong Kwon Ju, Myung Hwan Oh

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We have studied the effect of the paramagnetic defects in carbon films on the field-emission properties. The paramagnetic defects in carbon films originating from the carbon dangling bonds were measured using electron spin resonance (ESR). We found a reduction of the dangling bond density in the annealed carbon films in N2/H2 atmosphere from ESR spectroscopy. The annealed films with lower defect densities, i.e., dangling bonds, showed an improved characteristic of higher emission current density as well as a lower turn-on electric field in the Fowler-Nordheim type tunneling. Also in the annealed carbon films a correlation is observed between the decrease of band gap estimated from the electrical conductivity and the reduction of dangling bond density. The earlier results indicate that the enhancement of the emission current level in the annealed carbon films is related to the decrease of the ESR centers.

Original languageEnglish
Pages (from-to)7519-7523
Number of pages5
JournalJournal of Applied Physics
Issue number10
Publication statusPublished - 2000 May 15


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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