Influence of CdTe Deposition Temperature and Window Thickness on CdTe Grain Size and Lifetime After CdCl2 Recrystallization

Mahisha Amarasinghe, Eric Colegrove, Helio Moutinho, David Albin, Joel Duenow, Mowafak Al-Jassim, Wyatt Metzger, Steven Johnston, Jason Kephart, Walajabad Sampath, Siva Sivananthan

Research output: Contribution to journalArticlepeer-review

18 Scopus Citations


Grain structure influences both transport and recombination in CdTe solar cells. Larger grains generally are obtained with higher deposition temperatures, but commercially it is important to avoid softening soda-lime glass. Furthermore, depositing at lower temperatures can enable different substrates and reduced cost in the future. We examine how initial deposition temperatures and morphology influence grain size and lifetime after CdCl2 recrystallization. Techniques are developed to estimate grain distribution quickly with low-cost optical microscopy, which compares well with electron backscatter diffraction data providing corroborative assessments of exposed CdTe grain structures. Average grain size increases as a function of CdCl2 temperature. For lower temperature close-spaced sublimation CdTe depositions, there can be more stress and grain segregation during recrystallization. However, the resulting lifetimes and grain sizes are similar to high-temperature CdTe depositions. The grain structures and lifetimes are largely independent of the presence and/or interdiffusion of Se at the interface, before and after the CdCl2 treatment.
Original languageAmerican English
Pages (from-to)600-603
Number of pages4
JournalIEEE Journal of Photovoltaics
Issue number2
StatePublished - 2018

NREL Publication Number

  • NREL/JA-5K00-68664


  • cadmium telluride
  • charge carrier lifetime
  • grain boundaries
  • grain size
  • photovoltaic cells
  • semiconductor devices
  • thin film devices


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