The QE numerical simulation of PEA semiconductor photocathode

  title={The QE numerical simulation of PEA semiconductor photocathode},
  author={Xu-dong Li and Qiang Gu and Mengchao Zhang and Minghua Zhao},
  journal={Chinese Physics C},
Several kinds of models have already been proposed to explain the photoemission process. The exact photoemission theory of the semiconductor photocathode was not well established after decades of research. In this paper an integral equation of quantum efficiency (QE) is constructed to describe the photoemission of positive electron affinity (PEA) of the semiconductor photocathode based on the three-step photoemission model. Various factors (e.g., forbidden band gap, electron affinity, photon… 

Figures and Tables from this paper

Overview of the Semiconductor Photocathode Research in China

With the growing demand from scientific projects such as the X-ray free electron laser (XFEL), ultrafast electron diffraction/microscopy (UED/UEM) and electron ion collider (EIC), the semiconductor

Quantum Efficiency Enhancement by Mie Resonance from GaAs Photocathodes Structured with Surface Nanopillar Arrays

A new type of negative electron affinity (NEA) photocathode based on GaAs nanopillar array (NPA) Mie-type resonators was demonstrated for the first time. For visible wavelengths, the Mie resonances

Effect of Sb thickness on the performance of bialkali-antimonide photocathodes

The alkali species Cs and K were codeposited using an effusion source, onto relatively thick layers of Sb (50 nm to ∼7 μm) grown on GaAs and Ta substrates inside a vacuum chamber that was baked and

Nondispersive solutions to the L2-critical Half-Wave Equation

AbstractWe consider the focusing L2-critical half-wave equation in one space dimension, $$i \partial_t u = D u - |u|^2 u$$, where D denotes the first-order fractional derivative. Standard arguments



A photoemission model for low work function coated metal surfaces and its experimental validation

Photocathodes are a critical component many linear accelerator based light sources. The development of a custom-engineered photocathode based on low work function coatings requires an experimentally

Modern theory and applications of photocathodes

A theory of photoemission is presented which has proven over the last thirty years to provide a very useful description of this process, both for fundamental and practical applications. This is the

Preparation and study of properties of a few alkali antimonide photocathodes

A new processing technique for a few alkali antimonide photocathodes is described. This technique does not require an initial antimony layer as in the conventional techniques. Electron microscopic

Multi-Alkali Photocathode Development at Brookhaven National Lab for Application in Superconducting Photoinjectors

The development of a suitable photocathode for use in a high average current photoinjector at temperatures ranging from 273 K down to 2 K is a subject of considerable interest, and active research.

In situ cleaning of metal cathodes using a hydrogen ion beam

Metal photocathodes are commonly used in high-field rf guns because they are robust, straightforward to implement, and tolerate relatively poor vacuum compared to semiconductor cathodes. However,

Thermal emittance measurements of a cesium potassium antimonide photocathode

Thermal emittance measurements of a CsK2Sb photocathode at several laser wavelengths are presented. The emittance is obtained with a solenoid scan technique using a high voltage dc photoemission gun.


The requirements for high quantum efficiency in the visible spectral range and an increased lifetime as compared to cesiated GaAs can be met by multi-alkali photocathodes, either CsKSb or NaKSb. In