A molecular precursor route to quaternary chalcogenide CFTS (Cu2FeSnS4) powders as potential solar absorber materials

Research output: Contribution to journalArticle

  • External authors:
  • Abdulaziz Alanazi
  • Firoz Alam
  • Abdelmajid Salhi
  • Paul O'Brien

Abstract

In the present work we report on the synthesis of tetragonal phase of stannite Cu2FeSnS4 powder from Sn(II) and Sn(IV) using a solvent free melt method using a mixture of Cu, Fe, Sn(II) / Sn(IV) O-ethylxanthates and annealed at different temperatures. The as-synthesized powders were characterized by powder X-ray diffraction (p-XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-Vis absorption spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy, which confirm the succesful synthesis of stannite CFTS. Optical measurements shows that Cu2FeSnS4 powders have visible light absorption onsets in the far red with direct band gap energies in the range 1.32 eV - 1.39 eV which are suitable for acting as efficient absorber layers in solar cells. Electronic characterisation of these materials deposited as thin films by spin coating show that they are p type semiconductors with respectable carrier mobilities of ca. 60 cm2 V-1 s-1 with carrier densities in the order of 1014 cm-1.

Bibliographical metadata

Original languageEnglish
JournalRSC Advances
Publication statusAccepted/In press - 25 Jul 2019