Investigation on Vibrational, Optical and Structural Properties of an Amorphous Se$_{0.80}$S$_{0.20}$ Alloy Produced by Mechanical Alloying

TL;DR

This study investigates the vibrational, optical, and structural properties of an amorphous Se$_{0.80}$S$_{0.20}$ alloy produced by Mechanical Alloying using various spectroscopic and simulation techniques.

Contribution

It provides new insights into how sulphur concentration affects the structural and optical properties of amorphous selenium-sulfur alloys.

Findings

Coordination numbers vary with sulphur content.

Interatomic distances are influenced by sulphur concentration.

Optical gap energy depends on alloy composition.

Abstract

An amorphous Se$_{0.80}$S$_{0.20}$ alloy produced by Mechanical Alloying was studied by Raman spectroscopy, x-ray diffraction, extended x-ray absorption fine structure (EXAFS) and optical absorption spectroscopy, and also through reverse Monte Carlo simulations of its total structure factor and EXAFS data. Its vibrational modes, optical gap and structural properties as average interatomic distances and average coordination numbers were determined and compared to those found for an amorphous Se$_{0.90}$S$_{0.10}$ alloy. The results indicate that coordination numbers, interatomic distances and also the gap energy depend on the sulphur concentration.