Influence of substrate heating on optical, morphological and photoemission properties of CsI thin films for imaging application

Optical and morphological properties of semi-transparent Caesium Iodide (CsI) thin films for three different film thicknesses deposited at a substrate temperature of 1200C have been investigated. The photoemission properties were also studied to know the performance of such photocathodes. A comparison between the films deposited by keeping the substrate at room temperature (270C) and the films deposited at 1200C is presented. Effect of substrate temperature on the morphological, optical and photoemission properties are presented. Optimization requirement of a semi-transparent photocathode for high sensitivity performance is discussed here.