TUYBA5
BNL, Upton, New York, USA
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TUYBA5 |
New Methods of Synthesizing Ultra-Smooth and High Efficiency Alkali Antimonide Photocathodes for Future Light Sources | |
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| High quantum yield, low emittance, long lifetime bi-alkali photocathode has been one of the most significant directions in the photocathode development in recent years. Among various studies effusion cell evaporation has been proven for high potential in achieving such requirements. In this paper we report the results of the study on both the 1 step and 2 step tenuary co-evaporation of cesium potassium antimonide (K-Cs-Sb) photocathodes from alkali effusion cells, with in situ and operando X-ray characterization techniques. We were able to achieve 1.2 nm of surface roughness from an 80 nm thick photocathode film, with high crystallinity and a quantum efficacy exceeds 30% at 360 nm wavelength and 5.8% at 530 nm wavelength. | ||
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Slides TUYBA5 [5.209 MB] | |
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