Carbon Nanotube Composite Electron Emission Source

The patent employs a composite structure consisting of carbon nanotube layer, semiconductor layer, and insulating layer. The carbon nanotube layer provides low work function for electron emission, the semiconductor layer accelerates electrons through its electric field, and the insulating layer provides electrical isolation. This composite material approach enables high electron emission efficiency by combining materials with complementary properties, directly resolving the contradiction between emission efficiency and structural simplicity.

The patent introduces through holes and apertures in the carbon nanotube layer to create localized regions for enhanced electron emission. These aperture structures concentrate the electric field and provide direct pathways for electron escape, improving emission efficiency at specific locations without requiring complete structural redesign. This local quality enhancement resolves the contradiction by improving performance at critical points while maintaining overall structural integrity.

The patent forms the carbon nanotube layer with through holes and apertures before depositing the semiconductor and insulating layers. This preliminary structuring allows subsequent layers to be deposited conformally over the complex topology, simplifying the overall manufacturing process. The through holes are created in advance to guide electron emission pathways, improving efficiency without requiring complex post-processing steps.

The patent implements a nested structure where the semiconductor layer is deposited over the carbon nanotube layer with through holes, and the insulating layer is deposited over the semiconductor layer. This nested arrangement allows each layer to be processed independently using standard deposition techniques, reducing manufacturing complexity while achieving the desired complex functionality through hierarchical structuring.