Electron field emission in air from 5H-BN micro-cone films prepared by plasma-assisted laser CVD

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The characteristics of electron field emission in sp^<3->bonded 5H-BN films prepared by laser-assisted plasma CVD wer studied. Their merits originated from mainly three factors. The first is the surface effect due to the electric dipole moment formed by the chemisorbed hydrogena and nitrogen atoms, which favors the electron field emission. The second is the effective work function inherent in the new crystal structure of the sp^<3->bonded BN polytypic forms. The third is the surface morphology made of micro-cones that favored the emission due to the geometrical enhancement of the local electric field. The combinatorial effect of these factors enabled the electron field emission evem in the air. The new structures of sp^<3->bonded BN were successfully prepared by this method and the new analytic method using a diagram for understanding the strcutural stability of polytypes was established and utilized for the fabrication of these BN films.