Basic Studies of High Performance Multialkali Photocathodes

Abstract

X-ray photoemission studies (XPS) of Cs3Sb, Na2KSb, and Na2KSb(Cs) alkali antimonide photocathodes prepared in ultrahigh vacuum on pyrex, suprasil quartz, and stainless steel substrates have been made. The results for these surfaces are the same. Employing the concept of the Auger Parameter we demonstrate that the most photosensitive alkali-antimonide photoemitters are ionic semiconductors with a direct correlation between degree of ionicity and photosensitivity. We further show the dependence of photoemission threshold on lattice constant and ionicity. It is concluded from these studies that the structure of the most photosensitive s-20 consists of a surface layer of K2CsSb upon a base layer of Na2KSb and not a monolayer of CS upon Na2KSb as we commonly thought.

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Document Details

Document Type
Technical Report
Publication Date
Mar 05, 1979
Accession Number
ADA066064

Entities

People

  • Clayton W. Bates Jr.

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Auger Electrons
  • Band Gaps
  • Band Structures
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Electrons
  • Energy Bands
  • Energy Gaps
  • Heat Of Formation
  • Materials
  • Materials Science
  • Photoelectric Emission
  • Solid State Physics
  • Spectra
  • Spectroscopy
  • Valence Bands

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene