Elimination of current non-uniformity in carbon nanotube field emitters |
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Authors: | Preeti Verma Poornendu Chaturvedi J S B S Rawat Manohar Kumar Surendra Pal Mahesh Bal D S Rawal Harsh Hanuman Prasad Vyas Partha Ghosal P K Bhatnagar |
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Affiliation: | (1) Solid State Physics Laboratory, Lucknow Road Timarpur, Delhi, 110054, India;(2) Defence Metallurgical Research Laboratory, Hyderabad, India;(3) Delhi University, South Campus, Delhi, India |
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Abstract: | Activation of abnormal emitting sites in Carbon Nano Tube (CNT) field emitters and their elimination is reported. CVD grown,
patterned CNT was used as cathode for field emission studies. We encountered the problem of current non-uniformity in CNT
cathode. This non-uniformity was attributed to abnormally active emitting sites during voltage ramp-up. The sudden increase
in current resulted in region of positive slope in F–N curve, which can’t be explained by conventional F–N theory. Also the
grown CNTs can be a mixture of metallic and semi conducting nature, which may cause deviation from the conventional F–N theory.
We could eliminate abnormally active sites by electric field treatment, thereby increasing current uniformity and stability.
The work is underway to understand the deviation in FN curve at high fields. |
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