X-Ray Absorption Spectroscopy Study of Structure and Stability of Disordered (Cu2SnS3)1-x(ZnS)x Alloys

Sin Cheng Siah, R. Jaramillo, Rupak Chakraborty, Peter T. Erslev, Cheng Jun Sun, Tsu Chien Weng, Michael F. Toney, Glenn Teeter, Tonio Buonassisi

Research output: Contribution to journalArticlepeer-review

15 Scopus Citations


Secondary phase segregation is hypothesized to have detrimental impacts on Cu2ZnSnS4 (CZTS) thin-film solar cells. In this study, we demonstrate the potential of using kinetic stabilization to inhibit phase decomposition in CZTS. By growing CZTS films at low temperature, we achieve a kinetically stabilized alloy with an expanded solid solution window in the pseudoternary CuS-ZnS-SnS phase diagram. Using X-ray absorption spectroscopy, we study the structural evolution and stability of this metastable alloy upon annealing. For near-stoichiometric samples, we observe a continuous emergence of short-range order toward crystalline CZTS that is nearly complete after a 1-min anneal at 450 °C. For Zn-rich samples, we detect precipitation of ZnS upon annealing, which suggests that the excess Zn exists as cation antisite defects in metastable CZTS.

Original languageAmerican English
Article number6934997
Pages (from-to)372-377
Number of pages6
JournalIEEE Journal of Photovoltaics
Issue number1
StatePublished - 2015

Bibliographical note

Publisher Copyright:
© 2014 IEEE.

NREL Publication Number

  • NREL/JA-5K00-63950


  • Amorphous semiconductors
  • annealing
  • photovoltaic cells
  • thin films


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