Impact of superlattice size on quantum efficiency and polarization in MOCVD-grown strained GaAs/GaAsP photocathodes
Abstract
Strained superlattice GaAs photocathodes are crucial for providing high photocurrent beams of spin-polarized electrons at several accelerator facilities including the Continuous Electron Beam Accelerator Facility at Thomas Jefferson National Accelerator Facility and the future Electron–Ion Collider at Brookhaven National Laboratory. In this work, we study the effects of varying the number of superlattice pairs on the polarization and photocurrent of the photocathodes. We observe a saturation in quantum efficiency beyond 30 pairs, with additional layers yielding minimal photocurrent improvement while noticeably reducing the polarization of the beam.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (10)
Adam Masters
Old Dominion University 1 , 5115 Hampton Blvd, Norfolk, Virginia 23529,
Greg Blume
Old Dominion University 1 , 5115 Hampton Blvd, Norfolk, Virginia 23529,
Sushil Poudel
Old Dominion University 1 , 5115 Hampton Blvd, Norfolk, Virginia 23529,
Joseph Michael Grames
Thomas Jefferson National Accelerator Facility 2 , 12000 Jefferson Avenue, Newport News, Virginia 23606,
Matt Poelker
Thomas Jefferson National Accelerator Facility 2 , 12000 Jefferson Avenue, Newport News, Virginia 23606,
Marcy Stutzman
Thomas Jefferson National Accelerator Facility 2 , 12000 Jefferson Avenue, Newport News, Virginia 23606,
Stephen Polly
Rochester Institute of Technology 3 , 1 Lomb Memorial Drive, Rochester, New York 14623,
Seth M. Hubbard
Rochester Institute of Technology 3 , 1 Lomb Memorial Drive, Rochester, New York 14623,
Sylvain Marsillac
Old Dominion University 1 , 5115 Hampton Blvd, Norfolk, Virginia 23529,
Matt Grau
Old Dominion University 1 , 5115 Hampton Blvd, Norfolk, Virginia 23529,