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TY - CONF AU - Bae, J. AU - Bazarov, I.V. AU - Cultrera, L. AU - Galdi, A. AU - Ikponmwen, F. AU - Maxson, J.M. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Enhanced Robustness of GaAs-Based Photocathodes Activation by Cs, Sb, and O2 J2 - Proc. of NAPAC2019, Lansing, MI, USA, 01-06 September 2019 CY - Lansing, MI, USA T2 - North American Particle Accelerator Conference T3 - 4 LA - english AB - Operational lifetime of GaAs photocathodes is the primary limit for applications as high current spin polarized electron sources in future nuclear physics facilities, such as Electron Ion Collider. Recently, ultrathin Cs₂Te on GaAs has shown a successful negative electron affinity (NEA) activation with an improved lifetime by a factor of 5 *. In this work, we report activation of GaAs with Cs, Sb and oxygen. Four different methods of introducing oxygen during the growth was investigated. Cs-Sb-O activated GaAs has shown up to a factor of 40 and 13 improvement in charge extraction lifetime and dark lifetime, respectively. PB - JACoW Publishing CP - Geneva, Switzerland SP - 210 EP - 212 KW - electron KW - cathode KW - polarization KW - vacuum KW - extraction DA - 2019/10 PY - 2019 SN - 2673-7000 SN - 978-3-95450-223-3 DO - doi:10.18429/JACoW-NAPAC2019-MOPLH17 UR - http://jacow.org/napac2019/papers/moplh17.pdf ER -