Study of Low Energy Electron Transparency of Graphene and Doped-Graphene via Electron Energy Analyzer*

Merid Legesse,¹ Vineet Mohanty,² Mohamed Farhat, Brian
Fu,² Sabre Kais,³ Timothy S Fisher,⁴ and Fahhad Alharbi^1
1Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Doha, Qatar.
²Department of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA.
³Department of Chemistry and Physics, Purdue University, West Lafayette, Indiana, USA.
⁴Department of Mechanical and Aerospace Engineering & California Nano Systems Institute,
University of California Los Angeles, Los Angeles, CA, USA

The electron transparency of graphene is investigated using Hemispherical Energy Analyzer. We
further compare the results to numerically obtained values and find excellent agreement between
the two. The measurements and calculations demonstrated that graphene is an excellent electron transparent
material even at low electron kinetic energies where the transmission exceeds 90% with 12-eV energy. The experimental data and the model is used to extract the parameters of the experimental setup. There are some discrepancies about electron transparency of graphene in literature. By, detailed analysis, we showed that these are due to the sensitivity of the transmission on the experimental setup.