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Electron Emission  

Hao Yan 

 Diamonds have excellent electron emission properties, yet their performances are limited by the requirement for thick films and the defects within. We address these challenges by creating electron emitters from monolayers of diamondoid molecules and demonstrate electron emission with small energy dispersion, low operation voltage and high stability. These proof-of-concept devices have broad applications in high-resolution microscopy, lithography, and accelerator technologies.

Image 1:Left: schematic of a graphene-protected diamondoid photoemitter. The diamondoids (rod and sphere, middle) forms a self-assembled monolayer on gold substrate (bottom) and are covered by a single layer of graphene (top). The graphene stabilizes the diamondoid monolayer while preserving the high monochromaticity of the photoelectrons. Right, a photoemission spectrum of the device showing extremely narrow (<20 meV) distribution of electron kinetic energy.

Publications 

1. "Monochromatic photocathodes from graphene-stabilized diamondoids." Hao Yan, Karthik Narasimha, Jonathan Denlinger, Fei Hua Li, Sung-Kwan Mo, J. Nathan Hohman, Jeremy E. P. Dahl, Robert M. K. Carlson, Boryslav A. Tkachenko, Andrey A. Fokin, Peter R. Schreiner, Zahid Hussain, Zhi-Xun Shen and Nicholas A. Melosh. Nano Lett. 18, pp. 1099-1103 (2018)

2. "Ultralow effective work function surfaces using diamondoid monolayers." Karthik Thimmavajjula Narasimha, Chenhao Ge, Jason D. Fabbri, William Clay, Boryslav A. Tkachenko, Andrey A. Fokin, Peter R. Schreiner, Jeremy E. Dahl, Robert M. K. Carlson, Z. X. Shen and Nicholas A. Melosh. Nature Nanotechnol. 11, pp. 267-272 (2016)