ZnS Nano Grains Deposited on Glass Window
ZnS Nano Grains Deposited on Glass Window as Energy Saving System
G. Kavei and S. Nikbin
Material and Energy Research Centre (MERC), Tehran, Iran.
Abstract – Zinc Sulfide nano grains were deposited on Crown glass slides by electron beam vapor deposition technique, at a substrate temperature of 60-150°C. The system was designed for energy saving in the building, and the involved properties in efficiency were considered. Thickness, roughness and optical properties of the films were examined as a function of the substrate temperatures. Deposited films at 150°C have large grain boundaries compared with the films at other temperatures. Samples heated in the range of 20°C -60°C, show the RMS roughness decrement of 1.1 nm to 0.6 nm, but the high increase in temperature up to ۱۵۰°C to 11.57 nm. Ellipsometry reveals at a higher temperature thickness was increased due to recombination of the nano grains forming large grains. Simulation may well testify experimental results from the combination of Cauchy layer and Effective Medium Approximation (EMA) model. Thin film with optimum properties prepared at temperature ۶۰°C with smallest grain size and correlation length. Observations show that the refractive index of ZnS film was lower than those for bulk.