07/10/21 00:38:05 TUUAoGJv
Field-emission properties of novel palladium nanogaps for surface conduction electron-emitters (SED)
Hsiang-Yu Lo et al 2007 Nanotechnology 18 475708 (7pp) doi:10.1088/0957-4484/18/47/475708
Hsiang-Yu Lo1, Yiming Li1,3, Hsueh-Yung Chao1, Chih-Hao Tsai2 and Fu-Ming Pan2
1 Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan
2 Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan
3 Author to whom any correspondence should be addressed
E-mail: ymli@faculty.nctu.edu.tw
Abstract. We explore novel nanometer-scale gaps with different widths in palladium (Pd) thin-film strips using hydrogen absorption under high-pressure conditions and different temperatures.
Both the experimental measurement and numerical calculation are conducted to examine the electron conduction properties of the newly proposed surface conduction electron-emitters (SCEs).
It is shown that this novel structure exhibits a high emission efficiency,
so that a low turn-on voltage of 40 V for an SCE with a 30 nm nanogap is obtained.
A calibrated model is adopted to predict the effects of the emitter thickness and different material work functions on emission current
with different width of nanogaps.
It is found that the heightened thickness increases the emission current.
However, it tends to saturate for smaller nanogaps.
The decrement of work function is proportional to the increase in emission current, which is independent of the width of nanogap.
Print publication: Issue 47 (28 November 2007)
Received 28 May 2007, in final form 27 September 2007
Published 19 October 2007
Field-emission properties of novel palladium nanogaps for surface conduction electron-emitters
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