Liquid phase assisted grain growth in Cu2ZnSnS4 nanoparticle thin films by alkali element incorporation

Sara Lena Josefin Engberg*, Stela Canulescu, Jørgen Schou

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    The effect of adding LiCl, NaCl, and KCl to Cu2ZnSnS4 (CZTS) nanoparticle thin-film samples annealed in a nitrogen and sulfur atmosphere is reported. We demonstrate that the organic ligand-free nanoparticles previously developed can be used to produce an absorber layer of high quality. The films were Zn-rich and Cu-poor, and no secondary phases except ZnS could be detected within the detection limit of the characterization tools used. Potassium was the most effective alkali metal to enhance grain growth, and resulted in films with a high photoluminescence signal and an optical band gap of 1.43 eV. The alkali metals were introduced in the form of chloride salts, and a significant amount of Cl was detected in the final films, but could be removed in a quick water rinse.
    Original languageEnglish
    JournalR S C Advances
    Volume8
    Issue number13
    Pages (from-to)7152-7158
    ISSN2046-2069
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Chemistry (all)
    • Chemical Engineering (all)
    • Chlorine compounds
    • Copper
    • Copper compounds
    • Energy gap
    • II-VI semiconductors
    • Lithium compounds
    • Nanoparticles
    • Potassium compounds
    • Sodium chloride
    • Thin films
    • Tin compounds
    • Zinc sulfide
    • Absorber layers
    • Alkali elements
    • Characterization tools
    • Detection limits
    • Organic ligands
    • Photoluminescence signals
    • Secondary phasis
    • Sulfur atmosphere
    • Grain growth

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