Speaker
Description
Photocathodes are fundamental to the advancement of electron accelerators and photon detectors. While ultrasmooth photocathodes produced by co-deposition processes have been developed, their beam brightness remains limited by surface and bulk disorders inherent to polycrystalline structures. Epitaxial growth offers a transformative pathway to address these challenges, enabling the production of high-brightness electron beams*. This work reports the pulsed laser deposition (PLD) assisted epitaxial growth of Cs2Te photocathodes on lattice-matched single-crystal substrates. Real-time growth monitoring via X-ray fluorescence (XRF) confirmed stoichiometric composition, while growth oscillations provided insights into the deposition process. The epitaxial nature of the films, characterized by a flat surface and high crystallinity, is validated through reflection high-energy electron diffraction (RHEED). Bulk crystallinity was further studied through X-ray diffraction (XRD) analysis. Spectral response of quantum efficiency (QE) with wavelength range 200 nm to 400 nm has been reported
Funding Agency
Work is supported by Brookhaven Science Associates, LLC under DE-SC0012704 with the U.S. Department of Energy.
Footnotes
*M. Gaowei et al, Codeposition of ultrasmooth and high quantum efficiency cesium telluride photocathodes, Physical Review Accelerators and Beams 22(7), 073401 (2019).
** C.T. Parzyck et al, Single-crystal alkali antimonide photocathodes: High efficiency in the ultrathin limit. Physical Review Letters 128(11), 114801 (2022).
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