Photoemission and optical constant measurements of Cesium Iodide thin film photocathode

TL;DR

This study measures the quantum efficiency, optical properties, and composition of a 500 nm cesium iodide thin film used as a photocathode, providing detailed optical and morphological data.

Contribution

It presents comprehensive optical, morphological, and compositional analysis of cesium iodide thin film photocathodes, including quantum efficiency and band gap measurements.

Findings

Quantum efficiency measured between 150-200 nm

Optical absorbance and band gap determined

Morphological and elemental composition analyzed

Abstract

The performance of cesium iodide as a reflective photocathode is presented. The absolute quantum efficiency of a 500 nm thick film of cesium iodide has been measured in the wavelength range 150 nm to 200 nm. The optical absorbance has been analyzed in the wavelength range 190 nm to 900 nm and the optical band gap energy has been calculated. The dispersion properties were determined from the refractive index using an envelope plot of the transmittance data. The morphological and elemental film composition have been investigated by atomic force microscopy and X-ray photo-electron spectroscopy techniques.