Planar Field Emitters and High Efficiency Photocathodes Based on Ultrananocrystalline Diamond

Antipov, Sergey P. ; Baryshev, Sergey V. ; Sumant, Anirudha V.

PID  :  NTRS Document ID: 20160011054

学科分类：物理（综合）

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

A method of forming a field emitter comprises disposing a first layer on a substrate. The first layer is seeded with nanodiamond particles. The substrate with the first layer disposed thereon is maintained at a first temperature and a first pressure in a mixture of gases which includes nitrogen. The first layer is exposed to a microwave plasma to form a nitrogen doped ultrananocrystalline diamond film on the first layer, which has a percentage of nitrogen in the range of about 0.05 atom % to about 0.5 atom %. The field emitter has about 10.sup.12 to about 10.sup.14 emitting sites per cm.sup.2. A photocathode can also be formed similarly by forming a nitrogen doped ultrananocrystalline diamond film on a substrate similar to the field emitter, and then hydrogen terminating the film. The photocathode is responsive to near ultraviolet light as well as to visible light.