Single phase FeS2 (pyrite) thin films prepared by combined electrodeposition and hydrothermal low temperature techniques

R. Henríquez, C. Vasquez, N. Briones, E. Muñoz, P. Leyton, E. A. Dalchiele

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

In current work the synthesis of single phase of FeS2 (pyrite) thin films from a combined electrochemical and hydrothermal techniques and without the need for a post sulfurization process is reported. Electrodeposition has been carried out in a non aqueous based electrolytic bath (diethylene glycol (DEG)). Voltamperometric measurements were conducted to study the electrochemical response of the precursors in this organic DEG solvent. These experiences allowed determining the best experimental conditions in DEG for obtaining the FeS/FeS2 mixture phases which were obtained applying a constant potential of -1.10V. The hydrothermal technique that was developed in a microwave oven improved stoichiometry and crystallinity of the deposits obtained by electrodeposition and led to obtaining a single pyrite phase. SEM micrographs exhibited complete substrate coverage whereas EDS analysis gave atomic ratio S/Fe very close to 2. XRD analysis of the final thin film shows that the deposit has a cubic structure without the presence of other undesired phases. However, Raman spectra indicate a later formation of amorphous superficial hematite. The optical measurements show an optical direct bandgap of 0.985 eV. Results open the possibility of applying the procedure to the formation of a thin film of FeS2 of good structural and optical characteristics that can be employed as an absorber material in solar cells.

Original languageEnglish
Pages (from-to)4966-4978
Number of pages13
JournalInternational Journal of Electrochemical Science
Volume11
Issue number6
DOIs
StatePublished - 1 Jun 2016
Externally publishedYes

Keywords

  • Electrodeposition
  • Hydrothermal
  • Low temperature
  • Pyrite thin films
  • Semiconductor material

Fingerprint

Dive into the research topics of 'Single phase FeS<sub>2</sub> (pyrite) thin films prepared by combined electrodeposition and hydrothermal low temperature techniques'. Together they form a unique fingerprint.

Cite this