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A stable surface layer is essential for a high stable long life-span photocathode.Byusing fluorine instead of oxygen in activating the surface of GaAs suhstrate,the strongelectronegativity of fluorine may improve the stability of photocathode.Life-span of reflectiveGaAs(Cs,F)photocathode has been made up to 8,500 hours.Furthermore,Its technologicalreproducibility and anti-contamination ability are better than those of GaAs(Cs,O_2)photocathodes.
A stable surface layer is essential for a high stable long life-span photocathode. By using oxygen instead of oxygen in activating the surface of GaAs suhstrate, the strongelectronegativity of fluorine may improve the stability of photocathode. Life-span of reflective GaAs (Cs, F) Photocathode has been made up to 8,500 hours. Futuremore, Its technological production and anti-contamination ability are better than those of GaAs (Cs, O_2) photocathodes.