MBE Growth of Graded Structures for Polarized Electron Emitters

SLAC National Accelerator Laboratory

关键词: Aluminium;    Antimony;    Superlattices;    43 Particle Accelerators;    Quantum Efficiency;   

DOI  :  10.2172/992985
RP-ID  :  SLAC-PUB-14127
RP-ID  :  AC02-76SF00515
RP-ID  :  992985

美国|英语

来源: UNT Digital Library

【 摘 要 】

SVT Associates, in collaboration with SLAC, have investigated two novel photocathode design concepts in an effort to increase polarization and quantum efficiency. AlGaAsSb/GaAs superlattice photocathodes were fabricated to explore the effect of antimony on device operation. In the second approach, an internal electrical field was created within the superlattice active layer by varying the aluminum composition in AlGaAs/GaAs. A 25% increase in quantum efficiency as a result of the gradient was observed.