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Title: Grain boundary enhanced carrier collection in CdTe solar cells

The atomic structure and composition of grain boundaries in CdCl2 treated CdTe solar cells have been determined with aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy. A high fraction of Te in the grain boundary regions has been substituted by Cl. Density functional calculations reveal the origin of such segregation levels, and further indicate the GBs are likely inverted to n-type, establishing local P-N junctions, which help to separate electron-hole carriers. The results are in good agreement with electron beam induced current observations of high collection efficiency at grain boundaries.
 [1] ;  [2] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5] ;  [1] ;  [2]
  1. ORNL
  2. University of Toledo
  3. University of Oxford
  4. University of Manchester, UK
  5. National Renewable Energy Laboratory (NREL)
Publication Date:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 112; Journal Issue: 15
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States