Study on work function and corresponding electron emission during NEA activation of GaAs surfaces

Y. Sada, T. Meguro

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We have investigated the relation between the work function and corresponding quantum efficiency during the negative electron affinity (NEA) activation processes of GaAs surfaces qualitatively and determined the regions of positive electron affinity (PEA) surface and NEA surface. We found that the two surface states of NEA and PEA were switched during the alternating supply of Cs and O2 in the NEA activation sequence. After the supply of O2 following Cs deposition onto the clean GaAs, the surface still showed the PEA state for a few minutes and changed to the NEA state with increase of electron emissions. It should be noted that once the NEA surface was formed, there were two regions where the quantum efficiency continued increasing, both with and without changing the shape of spectrum. As one possibility, we believe that the increase in quantum efficiency is related to the number of electron emission sites and that there are various electron emission structures.

Original languageEnglish
Article number145699
JournalApplied Surface Science
Volume513
DOIs
Publication statusPublished - 30 May 2020

Keywords

  • Electron emission
  • GaAs surface
  • NEA activation
  • Negative electron affinity
  • Work function

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