Activation of fullerene coatings on field emitters by potassium atom and ion fluxes |
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Authors: | T A Tumareva G G Sominskii A K Bondarenko A A Veselov I A Svetlov |
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Institution: | (1) St. Petersburg State Technical University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia |
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Abstract: | The activation of tip field emitters with a fullerene coating by the atomic and ionic fluxes of potassium is studied. The deposition of atomic potassium decreases characteristic voltage U 1 generating fixed fieldemission current I by a factor of 3.5–4.0. However, field emitters activated by potassium atoms are rapidly deactivated and the resulting decrease in U 1 after storage in a vacuum does not exceed 25–30%. A stable approximately twofold decrease in the characteristic voltage can be reached if the fullerene coating is exposed to a potassium ion flux. The enhanced efficiency of emitter activation by a potassium ion flux is explained by the formation of KC 60 endohedral and/or C60 K exohedral molecules in the fullerene coating. |
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