# Augmenting the band gap of iron diselenide pyrite via ruthenium alloy integration

## TL;DR

This study shows that adding ruthenium to iron diselenide films improves their optical and electrical properties, making them better for solar energy applications.

## Contribution

The novel integration of ruthenium via spray pyrolysis enhances the band gap and optical properties of FeSe2 for photovoltaic use.

## Key findings

- Ruthenium integration increases the direct band gap and absorption coefficient of FeSe2 films.
- N-type conductivity and temperature-dependent electrical properties were observed in the alloyed films.

## Abstract

The study aimed to enhance the properties of thin FeSe2 films by incorporating ruthenium through spray pyrolysis. Films were deposited on pre-heated glass substrates and subjected to controlled heating in a selenium-rich environment. X-ray diffraction analysis confirmed the presence of FeSe2 phase. Films with specific ruthenium ratios showed notable improvements in optical attributes, including increased absorption coefficient and a higher direct band gap, aligning with desired values for photovoltaic applications. Hall Effect measurements revealed N-type conductivity with varying concentrations and temperature-dependent electrical properties. The results highlight the efficacy of ruthenium as a promising alloying candidate for developing photovoltaic materials, emphasizing the versatility of the produced films across multiple domains.