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Emission properties of a hybrid metallized diamond(001) photocathode

L. A. Angeloni, I-J. Shan, and W. Andreas Schroeder*

  • *Contact author: andreas@uic.edu
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Phys. Rev. Accel. Beams 28, 123401 – Published 4 December, 2025

DOI: https://doi.org/10.1103/j1d9-bwdr

Abstract

The spectral emission characteristics of a proof-of-concept hybrid metallized diamond(001) photocathode are presented. The quantum efficiency (QE) is shown to be determined by the photoinjection efficiency across the ohmic contact at the back metallized face, whereas the mean transverse energy (MTE) of the photoemitted electrons is consistent with an (optical)phonon-assisted and momentum-resonant Franck-Condon mechanism [Franck-Condon electron emission from polar semiconductor photocathodes, Phys. Rev. Appl. 23, 054065 (2025)] following electron drift transport to the untreated diamond(001) front emission face. Emission is observed from both the lower and upper conduction bands of diamond with positive and negative electron affinity, respectively. A potential route to the realization of a red-visible photocathode based on this concept with a sub-50 meV MTE and a QE greater than 0.1% is discussed.

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Phys. Rev. Accel. Beams 28, 123401– Published 4 December, 2025
  • Received 17 June 2025
  • Accepted 10 October 2025
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