Central Technological Library of the University of Ljubljana (CTK)
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Growth and stoichiometry of the ▫$Cs_xSb$▫ surface film of a high-efficiency, multialkali-antimonide photocathodeErjavec, BojanThe heterojunction model of a highly efficient, semitransparent, multialkali-antimonide ▫$Na_2KSb(Cs,Sb)$▫ photocathode, consisting of a homogeneous, polycrystalline, p-type ▫$Na_2KSb$▫ base layer ... and an n-type ▫$Cs_xSb$▫ surface film ▫$(0\sx\se3)$▫ has been investigated. The thin ▫$Cs_xSb$▫ film was deposited onto the ▫$Na_2KSb$▫ base layer by alternating of Cs vapour and evaporations of Sb at elevated temperatures in an ultrahigh vacuum established in the standard image intensifier tube. An estimation of this film's thickness, which amounts to between 2.5 and 8.5 nm for the stoichometric ratio ▫$1\sex\se3$▫, was obtained using a hypothetical growth model of a thin film barrier one cluster-size thick on the photosensitive baselayer surface while analysing the photocurrent behaviour both during the introductions of Cs vapour and during the evaporations of Sb. This model was based on the growth of regular pyramids with a square net base 4X4 atoms and equilateral triangle sedes, on the apparent surface, and on a quantum mechanics scattering cross-section for elastic scattering of photoelectronics on the base boundry atoms. Comparisons of our calculated ▫$Cs_xSb-Cs$▫ dissociation vapour pressure relations with the reported ▫$P_{Cs}(T)$▫ expressions for Cs desorption from the ▫$Na_2KSb(Cs)$▫ photocathodes and of our estimated Sb MNN Auger signal asymmetry of the ▫$Cs_xSb$▫ compounds was obtained by means of a thermodynamically estimated valence charge transfer in ▫$Cs_xSb$▫, supposing their mutual linear dependence.Source: Thin solid films. - ISSN 0040-6090 (303, 1997, str. 4-16)Type of material - article, component partPublish date - 1997Language - englishCOBISS.SI-ID - 18138885
Author
Erjavec, Bojan
Topics
surface film |
high-efficiency multalkali-automonide photocathodes |
heterojunction model |
p-type base layer |
n-type surface film |
growth mechanism |
surface film thickness |
Cs-Sb binary system |
synthesis reactions |
Sb MNN Auger signal asymetry |
valence Marge transfer |
Cs equlibrium vapour pressures
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Erjavec, Bojan | 05673 |
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