Unraveling Cu Chemical Signature in CdTe by Spectral Fluorescence Mapping

Srisuda Rojsatien, Trumann Walker, Tara Nietzold, Barry Lai, Eric Colegrove, Michael Stuckelberger, Arun Mannodi-Kanakkithodi, Justin Pothoof, Maria Chan, Mariana Bertoni

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations


X-ray absorption spectroscopy (XAS) has been shown to be a powerful tool to unravel the chemical environment of a given atom within a matrix. When used in correlative X-ray microscopy approaches, XAS allows one to probe with nanoscale precision regions of particular interest in an absorber. Herein, we use X-ray absorption near edge structure (XANES) to evaluate the chemical environment of Cu atoms within a CdTe solar cell. The reconstruction of XANES spectra from XRF maps have unfolded 2D maps of Cu chemical structures. In this work, we found that most Cu atoms exist in Cu2Te and Cu1.4Te phase. Moreover, we found traces of CuTe, Cu2O, CuO, Cu2S, CuS, and metallic Cu phase. Investigating Cu chemical structures at different performing areas, we found no observable correlation between Cu chemical structures and electrical performance. This approach allows tracking of Cu chemical structures along with electrical performance and elemental distribution simultaneously, with high spatial resolution in a statistically practical way.

Original languageAmerican English
Number of pages6
StatePublished - 20 Jun 2021
Event48th IEEE Photovoltaic Specialists Conference, PVSC 2021 - Fort Lauderdale, United States
Duration: 20 Jun 202125 Jun 2021


Conference48th IEEE Photovoltaic Specialists Conference, PVSC 2021
Country/TerritoryUnited States
CityFort Lauderdale

Bibliographical note

Publisher Copyright:
© 2021 IEEE.

NREL Publication Number

  • NREL/CP-5K00-81135


  • CdTe
  • CuO
  • CuS
  • CuTe
  • FEFF9
  • metallic Cu
  • XANES reconstruction
  • XBIC
  • XRF


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