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The authors report on the growth of Na2KSb bialkali and Na2KSb:Cs3Sb multialkali photocathodes using the vapors generated by evaporating pure metals with effusion cells under vacuum conditions. Details about the ultrahigh vacuum growth system and the used procedures are provided. The new growth system is capable of growing over large areas with uniform photoemission properties using different types of substrates. The measured spectral response curves indicate that high quality photocathodes are produced with peak quantum efficiencies well above 20%. Procedures to obtain multialkali photocathodes with extended sensitivity into the infrared range (well above 800 nm) are described.

Alkali antimonides photocathodes growth using pure metals evaporation from effusion cells