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The development of high-performance photocathodes is a key challenge forfuture accelerator and particle physics applications. In this paperphotocathode growth through molecular beam epitaxy is introduced as a promisingtechnique to obtain robust, highly efficient alkali-antimonide basedphotocathodes. Recent research shows that the quantum efficiency ofphotocathodes can be significantly enhanced through control of the photocathodecrystallinity. Molecular beam epitaxy allows for cost-effective growth oflarge-area photocathodes with excellent control of the stoichiometry andcrystallinity, making photocathodes with peak quantum efficiencies exceeding35% routine.

High Performance Photocathodes based on Molecular Beam Epitaxy Deposition for Next Generation Photo Detectors and Light Sources