[SLAC Pubs and Reports]
InAlGaAs/AlGaAs Superlattices for Polarized Electron Photocathodes
Highly efficient emitters of polarized electrons based on the InAlGaAs/AlGaAs
superlattice give an optimistic prognosis to explorations of such structures as
the sources for accelerators. A new set of these SL structures with minimized
conduction band offset was designed and recently tested. A new technology of
surface protection in MBE growth leads to a significantly reduced heat
-cleaning temperature. At these lowered cleaning temperatures, the thermal
degradation of the working structure parameters is avoided. As a result a
polarization P of up to 91% at corresponding quantum efficiency (QE) of 0.3%
was achieved at room temperature.
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