Structural and optical properties of (AgxCu1-x)2ZnSnS4 thin films synthesised via solution route

Jitendra Kumar, Sarang Ingole

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Silver (Ag) has been introduced in the quaternary compound Cu2ZnSnS4 synthesised via solution chemistry. Thin films of the resulting pentanary alloys (AgxCu1-x)2ZnSnS4 (0 ≤ x ≤ 1) show remarkable change in their microstructure and electronic properties with the increasing Ag content. Going from Cu2ZnSnS4 (x = 0) to Ag2ZnSnS4 (x = 1), the grain size increased from 0.13 to 2 μm which could be attributed to the liquid assisted grain growth mechanism. The optical band gap increased from 1.5 to 2.0 eV due to the influence of d-orbitals of Ag atoms on the valence band edge. The charge carrier density decreased by two orders of magnitude with only 4 atomic % Ag (x = 0.04) incorporated in the films, which can be attributed to the reduction in the density of CuZn and VCu point defects with Ag atoms occupying the Cu-sublattice sites. Also, with increasing Ag content the lattice parameters a and b increased from 5.42 to 5.82 Å, whereas there was negligible change in the lattice parameter c.

Original languageEnglish
Pages (from-to)1089-1094
Number of pages6
JournalJournal of Alloys and Compounds
Volume727
DOIs
StatePublished - 15 Dec 2017
Externally publishedYes

Keywords

  • Band gap tuning
  • Kesterite
  • Microstructure
  • Pentanary alloy
  • Point defects
  • Silver alloying

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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