Solution-processed CuSbS2 thin films and superstrate solar cells with CdS/In2S3 buffer layers

Joel van Embden, Joao O. Mendes, Jacek J. Jasieniak, Anthony S.R. Chesman, Enrico della Gaspera

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Herein, we describe a method to deposit thin films of the semiconductor CuSbS2 with micrometer-sized grains under inert atmosphere at mild processing temperatures. This is achieved through the decomposition of Cu and Sb dithiocarbamate precursors. Through careful optimization of the processing conditions, phase-pure p-type CuSbS2 thin films with high photoconductivity have been achieved. Tunability of the Cu/Sb ratios is also demonstrated while maintaining phase purity. Photoelectrochemistry is conducted as a function of both processing temperature and Cu/Sb ratio with 10% copper-deficient films annealed between 350 and 400 °C, producing the highest relative photocurrent. To assess the performance of these thin films, planar thin-film solar cells are fabricated. Superstrate solar cells (glass/FTO/CdS/(In2S3)/CuSbS2/SPIRO/Au) with either a CdS n-type window layer or a CdS/In2S3 dual n-type window/buffer layer are investigated. The use of a thin buffer layer further boosts the overall device performance, and a champion power conversion efficiency of 1.72% is demonstrated. To date, this efficiency is among the best reported for CuSbS2 solar cells and the highest for solution-processed devices using a planar thin-film architecture.

Original languageEnglish
Pages (from-to)7885-7895
Number of pages11
JournalACS Applied Energy Materials
Issue number8
Publication statusPublished - 24 Aug 2020


  • Antimony
  • Chalcogenide
  • Copper
  • Molecular precursor
  • Semiconductor
  • Sulfide

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