Tuning electronic and photocatalytic properties in pulsed light synthesis of Cu2ZnSnS4 films from CuS-ZnS-SnS nanoparticles

Hyun Jun Hwang, Cheng Zeng, Changqing Pan, Michael Dexter, Rajiv Malhotra, Chih hung Chang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We investigate rapid in-situ synthesis of Cu2ZnSnS4 (CZTS) thin films via Intense Pulsed Light (IPL) irradiation of solution-deposited and mixed binary CuS, ZnS, SnS nanoparticles (NPs) in ambient conditions. The film phase, composition, morphology, electrical properties, optical properties and photocatalytic activity are characterized as a function of the optical fluence. Crystalline pure-phase kesterite CZTS films with high p-type conductivity of 51 S/cm and optical band gap 1.42 eV are synthesized within 15 s. Surprisingly, using supra-optimal IPL fluence (in 19 s) yields films with a composite CZTS-SnO2/SnS2 composition that exhibits about 20% higher photocatalytic efficiency and higher carrier mobility (≈ 120 cm2/Vs) than pure-phase kesterite films. The reaction pathways during IPL irradiation and the resulting film composition are used to understand the enhanced photocatalysis for the supra-optimal fluence. This work will create new avenues for scalable IPL-based bottom-up synthesis of new multinary chalcogenide composites from their binary NPs.

Original languageEnglish (US)
Article number110645
JournalMaterials Research Bulletin
Volume122
DOIs
StatePublished - Feb 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Binary nanoparticles
  • CuZnSnS
  • Intense pulsed light synthesis
  • Photocatalyst

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